uncertainty and species recovery program design abstract this paper explores economic aspects of reintroducing large wide ranging mammalian carnivores such as wolves and grizzly bears to their native habitats the key tension is that such species can inflict transboundary damages for which managers are not liable with certainty we show that this tension can be offset by the manager s judicious choice of habitat as habitat contributes both directly to the likelihood of the species survival from a biological point of view and indirectly as precautionary capital that partially mitigates damages we show how uncertainty over liability for damages affects the likelihood of the species survival and we conclude with a discussion of optimal compensation mechanisms

introducing cooperative push how inefficient environmental policy sometimes protects the global commons better in this paper we argue that the incentive structures of the gamesnations play in international environmental negotiations dependupon the choice of environmental policy instruments bargainingon the use of some instrument e g an effluent charge mayput the players into a dilemma game like chicken negotiationsto apply a different instrument say an emission reductionquota may lead to a cooperation game like stag hunt the higherthe incentive to cooperate in the type of game which is built upby a specific instrument the higher is this instrument s cooperative push of course comparing two instruments the one with the higher cooperative push might well be the lessefficient one in this paper we analyse a situation where thehigher cooperative push of an instrument overcompensates thisinstrument s lower efficiency aggregate welfare withbilateral cooperation the equilibrium of stag hunt is higher than withunilateral cooperation the equilibrium of the chicken game the question remains whether sovereign countries decide to playstag hunt ending up in the welfare superior equilibrium it isshown below that they do not in an uncoordinated optimising setting however we develop a particular frame where the proposedsolution meets the criteria of individual rationality stability and fairness it thereby establishes the politically mostdesired result international cooperation

living in an uncertain world environment substitution local and global indeterminacy abstract environmental problems are increasingly frequent intensive and unpredictable to protect from the observed environmental depletion economic agents increasingly react by substituting previously free public environmental goods with costly private goods this substitution mechanism however can contribute to enhance the indeterminacy of the possible consequences of mankind activity further increasing the uncertainty on the future environmental trajectories to investigate this issue the paper proposes an intertemporal optimization problem in which agents derive utility from three goods leisure a public environmental good and or private consumption that can be used as a substitute for the environment the analysis shows that the economy may end up being trapped in the pareto dominated steady state and that both local and global indeterminacy may arise in the model no indeterminacy however emerges if green technologies are used so that production has no negative effects on the environment

forest management under fire risk when forest carbon sequestration has value abstract we develop a multiple forest use model to determine the optimal harvest date for a forest stand producing both timber and carbon benefits under a risk of fire an empirical application is provided for a forest owner producing maritime pine in southwest of france our results indicate that a higher risk of fire will decrease the optimal rotation period on the contrary higher carbon prices increase the optimal harvesting age to investigate the contradictory effects of fire risk and carbon price on forest rotation we identify the set of carbon prices and fire risks that lead to a given rotation age we also show that forest owner s willingness to pay for a risk reduction can be substantial 37 33 euros by ha and by year to reduce the annual fire risk from 1 26 to 0 07

shiftable externalities a market solution in this paper we propose a regulatory scheme for what has become known as shiftable externalities not in my backyard type garbage location problemswhere the externality is characterized by the absence of jointness in supply the scheme facilitates the establishment of a market for the externality and it isfeasible for a wider class of regulation problems and more information efficientthan the other regulatory schemes that have been proposed for this type ofexternality finally we show that it is possible to decentralize the participationdecision so as to take account of verification costs

monopoly pricing with negative network effects the case of vaccines abstract we study the market for vaccinations considering income heterogeneity on the demand side and monopoly power on the supply side a monopolist has an incentive to exploit the external effect of vaccinations and leave the poor susceptible in order to increase the willingness to pay the rich even the possibility of price discrimination does not remove this incentive we demonstrate that the weaknesses of standard policy measures are mitigated when income heterogeneity is taken into account this offers an efficiency based rationale for distribution oriented national or international public health interventions

managing exotic pests under uncertainty optimal control actions and bioeconomic investigations using a real options framework in continuous time we examine two problems associated with the management of exotic pests under uncertainty first we analyze the optimal timing of investing in a control action given fixed control costs we obtain a closed form solution for when to control an exotic pest whose density varies randomly second we define an analytical framework for finding the optimal expenditures for obtaining the relevant bioeconomic data our numerical results based on a wide range of bioeconomic parameters highlight the importance of accounting for uncertainty and irreversibility when developing simple rules to manage exotic pests

ex ante valuation of atmospheric visibility in a world incomplete markets for environmental goods ex ante planned expenditures rather than ex post realized outcomes explain the values which individuals attach to these goods we use the distance function to develop restrictions from a model of ex ante consumer behaviour involving these goods a contigent valuation approach is then employed to estimate policy relavant components of the ex ante economic values that recreationists attach to differing subjective probabilities of alternative atmospheric visibility levels at a wilderness location and at an urban location in oregon marginal valuations of probability changes are similar at the two sites marginal rates of time preference for resolving uncertainities vary between 10 and 50 and are inversely related to education existence value averages 10 of total value and evidence is mixed that site specific value act as surrogates for general environmental preferences

a note on defensive expenditures harmonised law diverse results in the context of many environmental hazards there is scope for self defence by victims multiple equilibria arise in a model of bilateral precaution under a regime of strict but incompletely enforced environmental liability this means that the same system of environmental law instigated in two economies may lead to very different outcomes it impacts upon policy analysis in a variety of ways and provides a channel for cultural factors to matter we explore the positive and normative effects of subsidising self defence

the transferability and depletability of externalities abstract this paper is concerned with symmetry and asymmetry in pollution pricing as conditions for the attainment of a pareto optimum in pollution pricing it has already been claimed freeman j environ econom manage 8 321 329 1984 that for both depletable and undepletable externalities pollution pricing should be asymmetric it is shown in this paper that the relevant distinction is not between depletable and undepletable externalities rather it is between transferable and non transferable externalities the effects of which can or cannot be transferred by the recipient to another party optimality requires symmetric pricing for transferable externalities and asymmetric pricing for non transferable externalities

the role of spatial scale in the timing of uncertain environmental policy the spatial scale of an environmental problem is dictated by boundaries physical boundaries limit the extent of impacts while the scale of decision making creates perceived boundaries beyond which impacts are ignored by decision makers while it is well understood that uncertainty and irreversibility will alter policy decisions aimed at alleviating environmental impacts the effect of spatial scales both physical and perceived is less understood when spatial scale is included in a real options model of environmental policy adoption results indicate that the importance and influence of spatial considerations depends on the level of uncertainty stringency of the proposed policy and flexibility of the policy decision recognizing spatial scale may force policy adoption to take place within a window of current damage when spatial scale is small or uncertainty high this window for policy adoption can close precluding policy adoption entirely this undermines well known results demonstrating that changes in uncertainty will only alter the timing of policy adoption in other instances the policy adoption window remains open but the option value increases faster than the benefits of the policy creating a scenario where it is always preferable to delay here the inclusion of an option value can prevent adoption of policies that would be adopted according to traditional cost benefit analysis in general policy decisions will be most affected by spatial considerations when the spatial scale is small damage is spreading fast and the uncertainty in damage spread is high

evidencing the waste effect of product service systems psss this paper adopts a waste centric analysis of product service systems psss to demonstrate that they do not automatically contribute to a dematerialization of the economy a decoupling of production from material and energy consumption and thus a transition toward sustainability a qualitative analysis of various nordic fashion psss that uses a combination of tukker s 2004 classification of psss and the european waste hierarchy model demonstrates that the waste effect of a pss is independent of its being product oriented use oriented or result oriented rather the effect depends on how the business model of the pss organizes material flows at production distribution use and post consumption stages in relationship to prevailing waste regimes where the pss operates we suggest that if a pss is to reduce its waste effect and contribute to dematerialization its business model should design material flows that fit with the prevailing waste regimes within the area it operates and prioritize waste prevention before considering reuse recycling energy recovery and landfilling

dyke maintenance and other stories some neglected types of public goods the orthodox summation model of a pure nonexcludable public good assumes that each individual consumes a quantity of public good defined as the sum of all individuals contributions to that good recently hirshleifer 1983 1985 has analyzed models that do not fall within this class at one extreme is the weakestlink in which the total quantity available to each consumer equals the smallest individual contribution at the other is the best shot in which the total quantity available equals the largest individual contribution hirshleifer s example of the weakest link case concerns a circular region of which each citizen owns a pie shaped slice the perimeter is marked by a dyke floods may penetrate the weakest point of the dyke and cause damage equally throughout the region each citizen decides the height and state of repair of that section of the dyke adjoining his piece of land its maintenance constituting his contribution to the public good thus the level of protection enjoyed by all is determined by the least well maintained section of the dyke an example of the best shot case concerns a number of antimissile batteries ringing a city firing at an incoming icbm all that matters is the accuracy of the best shot bliss and nalebuff 1984 discuss dragon slaying as another example of a best shot situation section ii of this paper introduces a class of functions of which the summation weakest link and best shot are examples section iii analyzes the properties of equilibrium when consumers have identical tastes and incomes section iv analyzes the implications of income redistribution in the summation case the equilibrium is unaffected by the initial redistribution over a range and outside that range transfers help the recipient and hurt the donor within the broader class of models however the invariance property does not generally hold and there may be opportunities for paretoimproving income redistribution i give an example similar to the weakest link case in which a pareto improving redistribution is

interaction protection and epidemics abstract individuals respond to the risk of contagious infections by restricting interaction and by investing in protection we develop a model that examines the trade off between these two actions and the consequences for infection rates there exists a unique equilibrium individuals who invest in protection choose to interact more relative to those who do not invest in protection changes in the contagiousness of the disease have non monotonic effects as a result interaction initially falls and then rises while infection rates too may initial increase and then decline we then consider a society with two communities that differ in their returns from interaction high and low individuals in isolated communities exhibit different behavior the high community has a higher rate of protection and interaction and a lower rate of infection integration amplifies these differences

stepping stones for biological invasion a bioeconomic model of transferable risk we investigate three sources of bias in valuation methods for ecosystem risk failure to consider substitution possibilities between goods failure to consider nonseparability of ecosystem services with market goods and failure to consider substitution possibilities between ecosystems the first two biases are known in the literature and we offer insight on the size of the bias for a specific example our work on spatially transferable risk is novel we develop the concept and show how it may undermine typical invasion prevention strategies we find three key results first partial equilibrium estimates of welfare loss are significantly overestimated relative to general equilibrium estimates if ecosystem services and market goods are substitutes the partial equilibrium bias is greater than if they are compliments second well intended policies do not necessarily reduce overall risk risk reduction actions can transfer risk to another time or location or both which may increase total risk third policies of quotas and inspections have to be extreme to improve welfare with inspections having advantages over quotas

the control of invasive species on private property with neighbor to neighbor spillovers invasive pests cross property boundaries property managers may have private incentives to control invasive species despite not having sufficient incentive to fully internalize the external costs of their role in spreading the invasion each property manager has a right to future use of his own property but his property may abut others properties enabling spread of an invasive species the incentives for a foresighted property manager to control invasive species have received little attention we consider the efforts of a foresighted property manager who has rights to future use of a property and has the ability to engage in repeated discrete control activities we find that higher rates of dispersal associated with proximity to neighboring properties reduce the private incentives for control controlling species at one location provides incentives to control at a neighboring location control at neighboring locations are strategic complements and coupled with spatial heterogeneity lead to a weaker link public good problem in which each property owner is unable to fully appropriate the benefits of his own control activity future use rights and private costs suggest that there is scope for a series of coase like exchanges to internalize much of the costs associated with species invasion pigouvian taxes on invasive species potentially have qualitatively perverse behavioral effects a tax with a strong income effect e g failure of effective revenue recycling can reduce the value of property assets and diminish the incentive to manage insects on one s own property

risk self protection and ex ante economic value abstract we develop three propositions about the ex ante value of reduced risk if there is a continuous outcome distribution and if self protection influences outcome probability and severity then 1 unobservable utility terms cannot be eliminated from the ex ante value expressions 2 knowledge of the convexity or the nonconvexity of dose response functions is insufficient to sign changes in these expressions and 3 self protection expenditures need not be a lower bound measure of these expressions therefore many restrictions applied in recent empirical work on the economic value of risk changes are not immediately transferable to settings where endogenous risks prevail

optimal timing problems in environmental economics abstract because of the uncertainties and irreversibilities that are often inherent in environmental degradation its prevention and its economic consequences environmental policy design can involve important problems of timing i use a simple two period model to illustrate these optimal timing problems and their implications for environmental policy i then lay out and solve a continuous time model of policy adoption in which the policy itself entails sunk costs and environmental damage is irreversible the model generalizes earlier work in that it includes two stochastic state variables one captures uncertainty over environmental change and the other captures uncertainty over the social costs of environmental damage solutions of the model are used to show the implications of these two types of uncertainty for the timing of policy adoption

on the shiftable externalities abstract in the debate concerning how to treat the victims of a depletable externality bird argues that if the externality is shiftable it is efficient to tax the victim s shifting behavior or compensate his acceptance baumol and oates accept his conclusion in the revised edition of their acclaimed textbook however shaw and shaw assert that bird and baumol and oates taxation policy could be nonoptimal since they overlook the possibility of resisting the shift of an externality and the victim s conjectural variation this paper shows that with modifications made necessary by the conjectural variation each of the policy prescriptions proposed by those previous studies provides theoretically correct incentives for the victims but that they differ with respect to feasibility shaw and shaw appear to have misinterpreted bird and baumol and oates argument the analysis in this paper reveals that in the presence of a shiftable externality the pareto optimum must be at the corner some interesting implications can be derived from such a feature it is argued that in terms of feasibility the most favorable policy is one which compensates the victim s acceptance of a shiftable externality this argument is in accord with that of bird

on environmental federalism and direct emission control abstract a theoretical exception to the race to the bottom contends that if decentralized environmental policy is comprised of direct controls on each firm emissions standards are set too high when compared to a centralized optimum herein we examine potential distortions in decentralized decision making by reconciling two recent views of direct environmental controls we show that differences in direct control policy can arise from differences in the number of symmetric jurisdictions in an economy our results suggest the race is on once the number of jurisdictions competing for a fixed number of firms increase we see the race is off when few jurisdictions can exploit their form of environmental market power

specification of spatial dynamic externalities and implications for strategic behavior in disease control we propose a novel distance and density dependent specification of externalities that captures spatial dynamics within and between neighboring land parcels we use this specification to model the short and long distance diffusion and control of an infectious disease in two privately owned and ecologically connected vineyards using computational experiments to generate individual and aggregate payoffs our results suggest that ignoring the within parcel spatial dynamics in the model may overestimate the social cost of an externality we find that increased resource value heterogeneity defined as the difference in grape prices received by the two vineyards has a detrimental impact on aggregate payoffs

depletable externalities and pigouvian taxation abstract in their book baumol and oates the theory of environmental policy externalities public outlays and the quality of life prentice hall englewood cliffs n j 1975 argue that whether an externality is depletable private or undepletable public is the key characteristic in determining the optimal pricing pattern they argue that unlike the undepletable case a negative depletable externality requires not only a charge or tax on the generator of the externality but a payment or compensation to the victim in order to achieve pareto optimality it is shown that the key characteristic determining whether compensation of victims is required for efficiency is not the depletability of the externality but whether the victim can costlessly control or limit the amount of the damaging substance received

on estimating the option value of preserving a wilderness area in this paper option pricing theory is used to analyse whether or not to preserve a wilderness area a numerical approach is demonstrated that can be applied to any generalized stochastic process the impact of assuming that amenity value follows a logistic process rather than geometric brownian motion is considered the calculation of critical levels for amenity value necessary to justify preserving a wilderness area such as the killarney provincial park in ontario or the headwaters forest in california is demonstrated the impact of changing the assumed growth and volatility of amenity value is also examined jel classifcation d81 q26 ce memoire utilise la theorie de la tarification d une option pour analyser si on doit preserver un espace naturel on utilise une approche numerique qui peut etre appliquee a tout processus stochastique generalise on examine l impact de possibilites que le profil de la valeur de la ressource dans la temps suive un processus logistique plutot qu un pattern geometrique de type brownien le texte montre le calcul des niveaux critiques de la valeur de la ressource qui seraient necessaires pour justifier la preservation d une espace naturel comme le parc provincial killarney en ontario ou les forets headwaters en californie l impact de postulats differents quant a la croissance et a la volatilite de la valeur de la ressource est examine

the economics of cooperation over collective bads abstract pollution reciprocated among nations is analyzed graphically as a traded collective bad the model is contrasted to analogous methods of studying trade in public goods the model then is interpreted in terms of pollution taxes equilibrium and optimal outcomes are characterized by the tax policies needed to support them finally obstacles to tax trade solutions are noted and institutional solutions are suggested

optimal tax subsidy combinations for the flu season this paper uses a dynamic susceptible infected recovered sir epidemic model to identify optimal vaccination policy mixes for the flu season it begins with the solution to the relevant optimal control problem and then gives the derivation of a perfect foresight equilibrium outcome for vaccination behavior in an unregulated market both the optimal and market outcomes are characterized by switching curves in s i state space exact expressions for these are derived the final section discusses taxes and subsidies that can be used to attain the optimal outcome

beach nourishment as a dynamic capital accumulation problem abstract beach nourishment is a common coastal management strategy used to combat erosion along sandy coastlines it involves building out a beach with sand dredged from another location this paper develops a positive model of beach nourishment and generates testable hypotheses about how the frequency of nourishment responds to property values project costs erosion rates and discounting by treating the decision to nourish as a dynamic capital accumulation problem the model produces new insights about coupled economic geomorphological systems in particular determining whether the frequency of nourishment increases in response to physical and economic forces depends on whether the decay rate of nourishment sand exceeds the discount rate

natural resource use with limited tenure property rights abstract we study the dynamic harvest incentives faced by a renewable resource harvester with insecure property rights a resource concession is granted for a fixed duration after which it is renewed with a known probability only if a target stock is achieved despite the insecurity of this property right simple concessions contracts can be designed to induce first best harvest trajectories we examine how those contracts will depend on economic ecological and institutional variables and apply theoretical insights to two concessions managed fisheries in baja california mexico

institutionalisation of sustainable consumption patterns based on shared use the product service system pss concept has been proposed as a way of dealing with unsustainable patterns of consumption in the business to consumer b2c domain existing alternatives to traditional consumption based on ownership such as car sharing communal washing centres and tool sharing schemes indicate that more sustainable patterns of consumption may be found for other household functions however the low profile of these examples in society and on the market calls for a query into factors that may facilitate or hinder broader acceptance of more sustainable alternatives in this study the aforementioned examples are analysed from institutional and product service system perspectives and it is suggested that the embodiment of alternative consumption patterns into every day routines depends on institutional arrangements regulatory and normative on how the product service systems are designed and applied in practice and oil the socio cultural background of the society the systems are implemented in c 2004 elsevier b v all rights reserved less

the problem of the commons still unsettled after 100 years the problem of the commons is more important to our lives and thus more central to economics than a century ago when katharine coman led off the first issue of the american economic review as the us and other economies have grown the carrying capacity of the planet in regard to natural resources and environmental quality has become a greater concern particularly for commonproperty and open access resources the focus of this article is on some important unsettled problems of the commons within the realm of natural resources there are special challenges associated with renewable resources which are frequently characterized by open access an important example is the degradation of openaccess fisheries critical commons problems are also associated with environmental quality a key contribution of economics has been the development of market based approaches to environmental protection these instruments are key to addressing the ultimate commons problem of the twenty first century global climate change jel q15 q21 q22 q25 q54

carbon capture and storage and transboundary pollution a differential game approach abstract we study the strategic behavior of two countries facing transboundary co2 pollution under a differential game setting in our model the reduction of co2 concentration occurs through the carbon capture and storage process rather than through the adoption of cleaner technologies furthermore we first provide the explicit short run dynamics for this dynamic game with symmetric open loop and a special markovian nash strategy then we compare these strategies at the games steady states and along some balanced growth paths our results show that if the initial level of co2 is relatively high state dependent emissions reductions can lead to higher overall environmental quality hence feedback strategy leads to less social waste

optimal harvesting of stochastic spatial resources abstract we characterize the optimal harvest of a renewable resource in a generalized stochastic spatially explicit model despite the complexity of the model we are able to obtain sharp analytical results we find that the optimal harvest rule in general depends upon dispersal patterns of the resource across space and only in special circumstances do we find a modified golden rule of growth that is independent of dispersal patterns we also find that the optimal harvest rule may include closure of some areas to harvest either on a temporary or permanent basis biological reserves reserves alone cannot correct open access but may under sufficient spatial heterogeneity and connectivity increase profits if appropriate harvest controls are in place outside of reserves

private eradication of mobile public bads we consider analytically the non cooperative behavior of many private property owners who each controls the stock of a public bad such as an invasive weed species infectious disease fire or agricultural pest the stock of the public bad can grow and disperse across a spatial domain of arbitrary size in this setting we characterize the conditions under which private property owners will control or eradicate and determine how this decision depends on property specific environmental features and on the behavior of other landowners we show that high mobility or lower control by others result in lower private control but when the marginal dynamic cost of the bad is sufficiently large we find that complete eradication may be privately optimal despite the lack of consideration of others welfare in these cases eradication arises in the non cooperative game and is also socially optimal so there is in effect no externality finally when property harboring the bad is not owned or is owned in common we derive the side payments required to efficiently control the mobile public bad

information and the concept of option value this paper examines the arrow fisher henry concept of option value and analyzes its properties including its relationship to the value of information and the effects of increasing uncertainty about the future consequences of irreversible development it is shown that this option value is distinct from but bounded by the value of information in the overall decision problem also it is distinct from a concept of option value that appears in b s bernanke quart j econom 98 85 106 1983 however when there is a continuum of development levels rather than a binary choice between full development and no development some of these conclusions need to be modified

averting expenditure and the cost of pollution the paper considers the relationship between the willingness to pay for environmental quality and averting expenditures that is the costs of measures undertaken in efforts to counteract the consequences of pollution the models used assume perfect mobility among locations with different levels of environmental quality the major results are i averting expenditures are not in general a good measure of willingness to pay 2 averting expenditures are not always even a lower bound on willingness to pay 3 even when averting expenditures are a lower bound the difference between the level of such expenditures and willingness to pay carmot be attributed to the unavertible aesthetic consequences of pollution for almost every kind of environmental unpleasantness we face there are averting expenditures we can make to reduce and sometimes completely remove the damage for air pollution house paint air conditioners soap for water pollution wells bottled water purifiers for noise pollution storm windows thicker walls economists have long been aware that averting behavior is both possible and practiced and they have often suggested that expenditures on such behavior can be used as a measure of the costs imposed on society by various forms of pollution the literature on this subject is difficult to characterize but to the extent that a consensus has been reached it is that averting expenditures provide a lower bound estimate of the total costs imposed by pollution and the divergence between averting expenditures and the total costs of pollution arises from the fact that some consequences of pollution e g the simple unpleasantness of breathing dirty air cannot be averted 2 3 in this note we develop two simple models of the response of utility maximizing consumers to small changes in the level of pollution which they face in the first model we assume that environmental quality is desired solely because it reduces the need for averting expenditure we show that 1 the level of averting expenditure may be either a lower bound or an upper bound estimate of the consumer s

favorites and underdogs strategic behavior in an experimental contest conflicts between favorites and underdogs are everyday phenomena we examine their strategic behavior in an experimental contest and find behavior partially consistent with predictions favorites given a first mover advantage do overcommit effort relative to nash underdogs often select the best response effort level given the favorite s move overall dissipation of the prize was significantly higher with the strategic commitment relative to nash

the dynamics of spatial pollution the case of phosphorus runoff from agricultural land abstract the paper analyzes based on a land classification system the optimal management of negative production externalities while taking into account the intertemporal and spatial aspects of the problem to incorporate both aspects simultaneously a two stage modeling approach is proposed where the solution of the spatial problem first stage is optimized over time second stage as a result it is possible to relate long run and short run supply and input demand functions attention is given to runoffs from agricultural land leading to the contamination of a water body in particular the one of phosphorus and the eutrophication of lakes the employment of a land classification system supports a full information approach and allows to address the optimal management of mineral fertilizer and manure based on zonal taxes zonal permits and zonal standards which all vary over time

reexamining efficient rent seeking in laboratory markets given millner and pratt s 1989 finding of behavior inconsistent with theory we reexamine efficient rent seeking in experimental markets we show that a when r 3 no nash equilibrium exists and therefore behavior has no theoretical benchmark to judge consistency and b when r 1 with a new experimental design utilizing an explicit expected payoff matrix rent seeking behavior is consistent with both nash equilibrium and dissipation hypotheses

technological progress and sustainable development what about the rebound effect abstract sustainability concepts that rest on the idea of resource or energy efficiency improvements due to technological progress tend to overestimate the potential saving effects because they frequently ignore the behavioral responses evoked by technological improvements efficiency improvements also affect the demand for resources and energy and often an increase in efficiency by 1 will cause a reduction in resource use that is far below 1 or sometimes it can even cause an increase in resource use this phenomenon is commonly labeled the rebound effect which is well known among energy economists but never attracted much attention in ecological economics the paper starts with the traditional neoclassical analysis of the rebound effect in a partial equilibrium framework that concentrates on the demand of one particular energy service such as mobility or room temperature it also provides an overview of some of the main empirical studies based on this model that mostly confirm the existence of the rebound effect but are controversial about its actual importance however we have to go beyond the neoclassical single service model in order to take care of the variety of possible feedback affecting energy use the paper presents two important expansions of the single service model in order to show the potential relevance of the rebound effect to ecological economics first it is shown that in a multi services model it proves to be difficult to make general statements about the relevance of the rebound effect in this case the overall effect of an increase in energy efficiency on total energy use depends on the on the assumptions about the substitutability between the services considered and the direction of the income effect second the paper also tries to take care of the fact that changes in resource use or energy use are frequently just side effects of other forms of technological progress especially technological change of a time saving nature can have a large influence on energy use as many time saving devices for example faster modes of transport require an increase in energy consumption that is frequently reinforced by a rebound effect with respect to time this effect will be especially strong when wages are high and at the same time energy prices are low as is currently the case in most industrialized countries consequently the paper also provides a strong argument for the introduction of energy taxes

the transfer and application of product service systems from academia to uk manufacturing firms the servicisation of many advanced economies is thought by many commentators to provide opportunities to move society away from unsustainable patterns of production and consumption the concept of the product service system pss has been conceptualised in academic circles to assist in the attainment of such desirable futures this paper reports the findings of research conducted as part of the solid project which considered the transfer and application of the pss concept from academia to industry in the united kingdom it draws upon theories from evolutionary economics to provide a rationale for the transfer of the pss concept and the role of this in achieving desirable technological change the paper also identifies an appropriate methodology to transfer the pss concept from uk academic circles to industry and the factors which impact upon and importantly lead to the successful completion of this process the combination of theoretical insight with case study research is used to develop a framework that could help uk based intermediaries to complete the transfer of the pss concept this is seen as an integral part of public policies aimed at stimulating sustainable patterns of production and consumption

the timing and strategic role of self protection self protection has private goods characteristics as it reduces own exposure to pollution given a certain level of pollution we study the effect of timing self protection before after or simultaneously with abatement we find that self protection when timed before abatements has strategic effects in this case self protection shifts the second stage subgame perfect nash equilibrium of abatements such that own contributions of abatement are decreased and those of the other country are increased thereby shifting future abatement costs to the other country when countries cooperate only on abatement the incentives to shift future abatement costs are greater contrary to intention cooperation on abatement may in fact worsen environmental quality if it does not include self protection

harvesting a renewable resource under uncertainty abstract this paper presents a theory of harvesting that allows for partial harvests and accounts for the risk of extinction for biological assets with size dependent stochastic growth the harvesting decision is formulated as a disinvestment problem in continuous time and generalized faustmann formulas are derived the probability of extinction is then analyzed for a wide class of growth functions an illustration based on the logistic brownian motion shows that both optimal biomass at harvest and harvest size do not vary monotonically with uncertainty more generally this paper illustrates the importance of properly accounting for barriers in stochastic investment problems

the role of public policy in advancement of product service systems this article discusses developments in the area of product service systems pss and the need to facilitate the proliferation of the pss approach through public policies the article argues that policies that establish the framework conditions for environmental improvement are preferable to detailed legislation as they favour environmentally superior pss however there is also a need for more specifically targeted policy measures that stimulate knowledge creation and dissemination in the pss area this article suggests that informative policy measures should be used by authorities and reviews the results from the functional programme of the swedish epa as an example of this type of policy c 2003 elsevier science ltd all rights reserved

exploring the link between products and services in low income markets evidence from solar home systems one of the key challenges of energy access in emerging markets and developing countries is how to reach households and communities that are unlikely to get a grid connection in the long term or those that are connected to the grid but suffer from regular blackouts or low voltage by surveying entrepreneurs selling solar home systems shss on a commercial basis in emerging and developing countries this study is one of the first attempts to quantify the key elements of four potential product service systems psss cash credit leasing and fee for service whereas the fee for service approach was found to be suitable only under certain conditions all psss share two key elements for successful market deployment one or more years of maintenance and customer support in financing these customers new asset moreover it appears that private sector companies are in principle able to deliver shss to households with incomes greater than usd 1000 per year the implications for policy makers and development aid agencies are first to include maintenance services into public programmes or public private partnerships and second to explicitly consider financial risks for entrepreneurs e g customer commitment and repayment conditions

a conjectural variation approach to strategic tariff equilibria abstract this paper examines tariff equilibria in a static two country trade model under a general class of conjectures regarding foreign retaliation we assume that each country chooses its optimum tariff given some conjecture in this class and derive the associated conjectural tariff equilibrium which can be thought of as a nash equilibrium conditional on each country s conjecture about how the foreign country will retaliate our main contribution is to show that when marginal propensities to consume imports are sufficiently small increased expectation of retaliation results in lower equilibrium tariffs for both countries since countries in general probably do expect some retaliation it therefore appears that the traditional cournot nash analysis probably overstates the trade restrictiveness of tariff wars

the economic threshold with a stochastic pest population a real options approach using real options this paper formulates an optimal stopping model for applying pest control measures when the density of a pest population varies randomly a delay between successive pesticide applications is introduced to analyze the farmer s expected marginal cost of reentry this model is applied to the control of a foliar pest of apples via a pesticide and solved numerically a sensitivity analysis shows that the pest density that should trigger pesticide use can vary significantly with the pest density volatility incorporating pest randomness into simple decision rules may thus help better manage the chemicals applied to soils and crops

network software security and user incentives we study the effect of user incentives on software security in a network of individual users under costly patching and negative network security externalities for proprietary software or freeware we compare four alternative policies to manage network security i consumer self patching where no external incentives are provided for patching or purchasing ii mandatory patching iii patching rebate and iv usage tax we show that for proprietary software when the software security risk and the patching costs are high for both a welfare maximizing social planner and a profit maximizing vendor a patching rebate dominates the other policies however when the patching cost or the security risk is low self patching is best we also show that when a rebate is effective the profit maximizing rebate is decreasing in the security risk and increasing in patching costs the welfare maximizing rebates are also increasing in patching costs but can be increasing in the effective security risk when patching costs are high for freeware a usage tax is the most effective policy except when both patching costs and security risk are low in which case a patching rebate prevails optimal patching rebates and taxes tend to increase with increased security risk and patching costs but can decrease in the security risk for high risk levels our results suggest that both the value generated from software and vendor profits can be significantly improved by mechanisms that target user incentives to maintain software security

participation in farm commodity programs a stochastic dominance analysis grube correctly argues that mini max and maximax criteria can help analysts determine the interval in which for a given set of preferences there will be changes in the preferred distribution the criteria is of less value when simulations are used to generate distributions without exact a priori knowledge of the random draw of order statistics we will argue that in most cases one can go even further and solve for the specific break even level of risk aversion this should simplify the procedures commonly used to rank risky prospects the author calculates that for the data presented the mini max critical value is 0 000003 for risk preferrers and 0 000002 for risk avoiders he concludes that these are low values when compared to the range originally considered 0 04 to 0 03 since his numbers fall within our range this suggests that our range could have been narrower than it was but clearly our range did contain the values he calculated it is noteworthy that when the smaller coefficients were used the relative rankings of choices remained unchanged grube concludes that kp s results are correct in the sense that they give a correct ranking of the order in which alternatives would be chosen by decision makers with varying absolute risk aversion coefficients since ultimately risk analysts are interested in the relative ranking of risky prospects this would suggest that our results are more robust than the author implies in his remarks while grube has suggested a means of identifying the interval of interest we would argue that in many cases one could go further and solve for the break even level of risk preference the break even level would be that value at which there is a switching in the dominance of one distribution over another using results developed by hammond it should be possible to simplify both the calculation and presentation of stochastic dominance results by solving for the break even level two conditions must be satisfied in order to apply hammond s results first constant risk aversion must be assumed while the use of utility functions exhibiting decreasing risk aversion has been advocated in the theoretical literature and supported somewhat by empirical studies which have assessed utility functions in most applications constant risk aversion is assumed this is largely because wealth data is frequently unavailable or of questionable accuracy thus risk analysts typically assume that a decision maker s utility function can be approximated over the relevant range by a constant risk aversion function such as the negative exponential function u x 1 e ax

intertemporal depletion of resource sites by spatially distributed users mineral deposits and other exhaustible resources are scattered around the globe as are their users yet the theory for analyzing depletion of such resources assumes that all resource sites and all users are located in the same place when applying the theory therefore one is forced to disregard what often seems to be an important real world consideration our purpose here is to generalize harold hotelling s 1931 theory of exhaustible resources to accommodate situations in which resource sites and their users are spatially distributed our analysis has many applications it can be applied to a conventional exhaustible resource like oil alternatively it can be applied to an unconventional exhaustible resource like scarce landfill space shipments of solid waste to landfills in other states or countries have become a prominent public policy issue eduardo ley et al 2000 finally our analysis can be applied in situations where the space reflects not geographical location but characteristics of the resource e g the sulfur content hardness and so forth of coal which users find distinctive 2 only two theoretical papers in resource economics have introduced spatial considerations 3 jean jacques laffont and michel moreaux 1986 studied the extraction of resources from sites located along a line segment with all users at one end charles kolstad 1994 was the first to consider spatially distributed users in his formulation consumers are distributed uniformly along a line segment with resource sites at each end kolstad s approach although innovative requires that the set of users be parti

take a risk preferring prevention over control of biological invaders abstract scientists have argued that invasive species can be managed most cost effectively with greater investments in prevention further under ideas like the precautionary principle it is reasonable to expect that a cautious manager would use more prevention relative to control because it keeps more invaders out yet this is not typically done in many cases private and public resources are invested primarily to control existing invaders rather than to prevent new invasions managers frequently wait until after invaders have arrived and then scramble to limit the damages we believe these paradoxical decisions can be understood by recognizing the link between typical human preferences for risk bearing and the technology of risk reduction we demonstrate quantitatively how managers perceived to be cautious or averse to risk tend to shy away from prevention relative to control this counterintuitive result arises because control is a safer choice than prevention because its productivity is relatively less risky it works to remove existing invaders from the system in contrast the productivity of prevention is more uncertain because prevention only reduces the chance of invasion it does not eliminate it and invasion may not occur even in the absence of prevention managers averse to risk will inherently avoid as much uncertainty as possible whether the source of uncertainty regards ecological outcomes or economic productivity implications for environmental decision making are clear in invasive species management if managers act as though they are risk averse their caution can backfire when it leads to more control rather than prevention the social consequences of this choice are a greater probability of future invasions and lower social welfare our results suggest that social welfare is highest when managers were willing to take a risk with prevention

receptivity to the production of product service systems in the uk construction and manufacturing sectors a comparative analysis abstract trajectories of service innovations emanating from manufacturing sectors have been of particular interest to those wishing to improve resource productivity and promote sustainable development research has focused on product service systems psss which are a category of service innovations deliberately designed to offer superior environmental performance this paper draws on research which explored whether trajectories of pss can be induced on new uk housing developments to satisfy household demand and prevent household waste the research was undertaken with a uk speculative house builder and facilities management service providers from its supplier network qualitative data were collected via interviews and focus groups to enable rich accounts of the range of factors in these firms selection environments which affect receptivity to pss production to be developed these were compared with factors affecting receptivity to pss production identified in a study of uk manufacturers the results show that in contrast to the manufacturing study clear drivers for pss delivery on new housing developments are absent in external selection environments of participating firms and uncertainty associated with the potential of pss concepts to satisfy household demand inhibits development of requisite competence for pss delivery within these thus further research is needed to explore new pss supply arrangements involving a range of household service providers

redefining innovation eco innovation research and the contribution from ecological economics while innovation processes toward sustainable development eco innovations have received increasing attention during the past years theoretical and methodological approaches to analyze these processes are poorly developed against this background the term eco innovation is introduced in this paper addressing explicitly three kinds of changes towards sustainable development technological social and institutional innovation secondly the potential contribution of neoclassical and co evolutionary approaches from environmental and innovation economics to eco innovation research is discussed three peculiarities of eco innovation are identified the double externality problem the regulatory push pull effect and the increasing importance of social and institutional innovation while the first two are widely ignored in innovation economics the third is at the least not elaborated appropriately the consideration of these peculiarities may help to overcome market failure by establishing a specific eco innovation policy and to avoid a technology bias through a broader understanding of innovation finally perspectives for a specific contribution of ecological economics to eco innovation research are drawn it is argued that methodological pluralism as established in ecological economics would be very beneficial for eco innovation research a theoretical framework integrating elements from both neoclassical and evolutionary approaches should be pursued in order to consider the complexity of factors influencing innovation decisions as well as the specific role of regulatory instruments and the experience gathered in ecological economics integrating ecological social and economic aspects of sustainable development is highly useful for opening up innovation research to social and institutional changes 2000 elsevier science b v all rights reserved

bioeconomics of spatial exploitation in a patchy environment abstract this paper presents a model of renewable resource exploitation that incorporates both intertemporal dynamics and spatial movement the model combines the h s gordon vernon smith hypothesis of a rent dissipation process with ricardian notions that resources are exploited across space in a pattern dependent upon relative profitabilities the population structure is characterized in a manner consistent with modern biological ideas that stress patchiness heterogeneity and interconnections among and between patches generally we find the equilibrium patterns of biomass and effort across the system to be dependent upon bioeconomic conditions within each patch and the nature of the biological dispersal mechanism between patches we use simple examples to illustrate how the distribution of effort throughout the system reflects the heterogeneity and the spatial biological linkages

a portfolio balancing approach to natural capital and liabilities managing livestock and wildlife diseases with cross species transmission researchers often refer to stocks of desirable natural resources as natural capital and stocks of undesirable species as natural liabilities the logical extension is that when these natural resources interact then the ecosystem is a collection or portfolio of natural capital and liabilities however natural capital and liabilities held in an ecosystem portfolio are more complex to manage than financial asset portfolios the key problem in a financial asset portfolio is adjusting the rates of return on assets for risk and correlation of risk in contrast the returns on natural assets and liabilities require many other adjustments arising from stock related returns and depreciation that endogenously depend on both stocks and controls including interactions among these variables this means ecosystem portfolio analysis extends beyond the consideration of uncertainty and involves understanding complex economic ecological tradeoffs even in a deterministic setting we use capital theory in the context of a deterministic bioeconomic model of valuable wildlife livestock and a pathogen that can be passed between them to develop a portfolio balancing approach to understanding the tradeoffs associated with ecosystem management this specific ecosystem is highly relevant to conservation health and livestock agriculture within the context of this example we also explore issues of mitigation and adaptation to disease risks and the management implications of cross species transmission a final contribution is to examine how exports and infection risks influence the ecological thresholds that epidemiologists often focus on to guide disease management

species preservation and biodiversity value a real options approach abstract we evaluate biodiversity in a real options framework when the resources in use are substitutable we examine optimal conservation decisions given that a biodiversity loss is irreversible and that future use values are uncertain while species substitutability has been shown to reduce the value of diversity we show that the flexibility associated with substitutability is a source of value marginal species value is decreasing in the number of species but rising and convex in the value of the marginal species as we show in the two species homogenous model increased volatility raises biodiversity value and a positive correlation between species values both reduces the value of the pool of species and the value of biodiversity the role played by the correlation between the value of a species and the value of other species is reminiscent of the beta of a financial asset just like an asset with a negative beta derives additional value by providing insurance against fluctuations in the market portfolio a species whose value tends to move in the opposite direction as the species in use derives additional value from its higher probability to be available for substitution if the value of the species in use diminishes

externalities and compulsary vaccinations abstract this paper challenges the conventional wisdom that because of the free rider problem a case can be made for compulsary vaccination against infectious disease for a very general class of models requiring that all individuals be vaccinated is strictly dominated by free choice the market allocation is not optimum and in the full information optimum some individuals would be compelled to be vaccinated this allocation can be achieved by taxes and subsidies however the government can exploit the revelation properties of vaccination and achieve an even better allocation than the full information optimum

dynamic epidemiology and the market for vaccinations abstract the intent of this paper is to raise the question of how and when externalities can arise in the market for vaccinations static and dynamic models of such markets are developed and compared a special case in a continuous time dynamic framework is examined and is found to be efficient i e there is no externality this is in contrast to the results from the static formulation raising doubts about the suitability of a static approach these results indicate that the question of whether there are externalities in individual immunization decisions is more involved than is generally supposed

preventives versus treatments preventives are sold ex ante before disease status is realized while treatments are sold ex post even if the mean of the ex ante distribution of consumer values is the same as that ex post the shape of the distributions may differ generating a difference between the surplus each product can extract if for example consumers differ only in ex ante disease risk then a monopolist would have more difficulty extracting surplus with a preventive than with a treatment because treatment consumers having contracted the disease no longer differ in disease risk we show that the ratio of preventive to treatment producer surplus can be arbitrarily small in particular when the distribution of consumer values has a zipf shape and the disease is rare the firm s bias toward treatments can be reversed for example if the source of private information is disease severity learned ex post the difference between the producer surplus earned from the products can result in distorted rd the deadweight loss from this distortion can be as large as the entire producer surplus difference calibrations for hiv and heart attacks based on risk factors in the u s population suggest that the distribution of disease risk is sufficiently zipf similar to generate substantial differences between producer surplus from preventives and treatments empirically we find that proxies for the zipf similarity of the disease risk distribution are associated a significantly lower likelihood of vaccine development but not drug development jel codes o31 l11 i18 d42

environmental degradation as engine of undesirable economic growth via self protection consumption choices we analyze growth dynamics in an economy where the well being of economic agents depends on three goods leisure a free access environmental good and a private good that can be consumed as a substitute for the environmental resource the processes of production and consumption of the private good by each agent impose negative externalities on other agents through the depletion of the environmental good this paper shows that in such context the existence of private substitutes for environmental goods may fuel an undesirable economic growth process this process is driven by the continuous increase in agents needs for private consumption generated by the progressive reduction in free consumption of the environmental good

cooperative and noncooperative protection against transferable and filterable externalities given self protection from an undesirable environmental externality we examine under several conditions the efficiency properties of cooperative and noncooperative behavior we demonstrate that if self protection can transfer the externality to another agent then noncooperative behavior will lead to overprotection if self protection filters or dilutes the externality then noncooperation leads to underprotection in addition overprotection will worsen if an agent with more relative power is allowed a first mover advantage or if the damage function is elastic and transferability is uncertain finally a reduction in uncertainty about transferability will accentuate overprotection if the damage function is inelastic our results suggest that coordination of protection activities among agents will enhance the overall gains from environmental policy in the european single internal market of 1992 coordination minimizes the costs of environmental protection thereby reducing the public credibility of its foes

preference heterogeneity in the structural estimation of efficient pigovian incentives for insecticide spraying to reduce malaria this paper bridges the theoretical and empirical literatures on the role of preference heterogeneity in characterizing externalities related to disease transmission we use a theoretical structure similar to locational sorting models which characterize equilibria in terms of marginal individuals who are indifferent between locations in our case the locations are binary consisting of whether or not to take a discrete preventative action individual heterogeneity arises in this structure due to variation in the costs and disutility associated with prevention we demonstrate application of this approach in the context of participation in insecticide based indoor residual spraying programs for malaria control in northern uganda we identify the parameters of our theoretical model using a stated preference choice experiment combined with estimates from published epidemiological studies the model implies that pigovian subsidies for participation in this context should decrease household malaria risk by 19 25 our approach can be applied to other bioeconomic externalities with spillovers from discrete preventative actions including agricultural pest management and the control of pest infestations and invasive species

what a difference a stochastic process makes epidemiological based real options models of optimal treatment of disease the real options approach has been used within environmental economics to investigate the impact of uncertainty on the optimal timing of control measures to minimise the impacts of invasive species including pests and diseases previous studies typically model the growth in infected area using geometric brownian motion gbm the advantage of this simple approach is that it allows for closed form solutions however such a process does not capture the mechanisms underlying the spread of infection in particular the gbm assumption does not respect the natural upper boundary of the system which is determined by the maximum size of the host species nor the deceleration in the rate of infection as this boundary is approached we show how the stochastic process describing the growth in infected area can be derived from the characteristics of the spread of infection if the model used does not appropriately capture uncertainty in infection dynamics then the excessive delay before treatment implies that the full value of the option to treat is not realised indeed when uncertainty is high or the disease is fast spreading ignoring the mechanisms of infection spread can lead to control never being deployed thus the results presented here have important implications for the way in which the real options approach is applied to determine optimal timing of disease control given uncertainty in future disease progression

integrative re use systems as innovative business models for devising sustainable product service systems re use implies recovering items from the waste stream to use them in identical or similar processes mostly at consumer level currently re use is restricted to niches but by 2020 the european commission wants to mainstream re use as a waste management option to increase resource efficiency ecologically oriented work integration social enterprises focussing on re use re use eco wises might help accomplish as they not only intend to re integrate marginalised people into the labour market but provide comprehensive re use services e g repair and thus constitute a novel kind of sustainable product service system spss this paper contributes to a scientific framework for re use eco wises by linking existing theoretical knowledge on spss to novel knowledge from three cases representing the variety of re use eco wises in austria for analysis we use the so called business model canvas adding a comprehensive stakeholder consideration results show that re use eco wises contribute to all three dimensions of sustainability by helping reduce waste and increasing resource productivity and by providing jobs and affordable goods for disadvantaged people full implementation however will need additional efforts from all stakeholders involved including the eco wises themselves but also public authorities and society at large

taking one for the team is collective action more responsive to ecological change debate persists around the timing of risk reduction strategies for large scale ecological change for three reasons risks are difficult to predict they involve irreversibilities and they impact multiple jurisdictions the combination of these three factors creates a general class of filterable spatial dynamic externalities fsde in which one person s risk reduction investments reduce or filter undesirable events experienced by others and underestimates the option value placed on being able to respond to new information about the consequences of ecological change by focusing on the optimal intervention decision we illustrate how and when the opposing forces created by an fsde will lead to a divergence in private and collective risk reduction strategies we use bioinvasions as our motivating example the bioinvasion first hits one jurisdiction and that jurisdiction s risk reduction investment reduces the risk faced by all other jurisdiction we find that efforts to internalize the full benefits of risk reduction investments may have unintended consequences on the responsiveness of environmental policy there is a social welfare gain from asking the first jurisdiction to delay a risk reduction investment to internalize the option values of all at risk jurisdictions

efficient pollution regulation getting the prices right this paper argues for efficient environmental regulations that equate the mar ginal damage of pollution to marginal abatement costs across space the paper estimates the source specific marginal damages of air pollution and calculates the welfare gain from making the current sulfur dioxide allowance trading pro gram for power plants more efficient the savings from using trading ratios based on marginal damages are between 310 and 940 million per year the potential savings from setting aggregate emissions efficiently and from includ ing more sources of air pollution are many times higher jel h23 q53 q58

demand pull government policies to support product service system activity the case of energy service companies escos in the uk product service systems psss constitute a family of service based business models designed to satisfy our societal needs in an economically and environmentally sustainable manner to date however pss application has remained niche due to a variety of critical barriers this paper explores how demand pull national government policies could support pss activity by addressing these barriers and cultivating market demand lessons are drawn from a case study of how regulatory economic incentive informative and procurement policies have supported energy service company esco activity in the uk a sub set of the pss family focused on energy service provision subsequently five policy recommendations are presented to support pss activity 1 balancing economic incentives and regulatory disincentives 2 promoting indirect policy support 3 redesigning existing market structures 4 promoting locally led pss activity and 5 creating stable policy frameworks the paper warns however that national government policy cannot easily address all pss barriers such as customer preferences international developments technological progress and inherent business model weaknesses pointing to the need for other complementary solutions furthermore other governance actors beside national government could also implement pss supporting policies

harvesting and recovery decisions under uncertainty abstract a stochastic forest rotation model in the faustmann tradition is presented and exemplified the model combines harvesting decisions with the potential to recover or clean up to restore the land after very unfavorable evolutions of the stochastic growth process uncertainty is shown to have a generally ambiguous effect on the optimal choice of investment strategy it is also shown how such models can be related to theory of optimal inventory control

the resistibility and shiftability of depletable externalities abstract in their recently revised book baumol and oates the theory of environmental policy 2nd ed cambridge univ press cambridge uk 1988 accept bird s argument on the optimal taxation policy when externalities are shiftable and depletable their conclusion is that the standard pigouvian tax which is placed upon the generator of a negative externality can be extended to tax the victims who shift the externality to others or extended to compensate recipients in order to achieve pareto optimality it is shown in this paper that their conclusion is not free from error because the possibility of resisting a shifted externality and conjectural variations by recipients is not recognized whether an externality is shiftable depends not only on the shifting activity of the original victim but also the resisting activity of his neighbors and their conjectures about each other s action as such the shifters should be taxed and the recipients should be compensated at the same rate per unit of externality shifted if the tax base is the output of the shifting and resisting activities on the other hand if the tax base is the input which produced the shifting of the externality then both the shifters and the recipients should be subject to a tax or subsidy per unit of input that they have engaged in whether it is a tax or a subsidy depends on the direction and magnitude of the conjectural variation the model and its policy implication can be generalized to cover the omnipresent and wasteful rent seeking activities

an international tax on pollution and natural resource depletion abstract during 1989 we witnessed a surge in top level political concern for environmental problems expressed in major green speeches from politicians such as thatcher gorbachev and bush advocating the strengthening of international environmental cooperation when it comes to actual implementation however policies adopted are comparatively weak as illustrated by insufficient support for the united nations environment programme unep which still carries a vast responsibility and work load with a completely undersized budget and staff it is now time to start discussing concrete issues such as increased finance and the use of more efficient policies

valuing changes in health risks a comparison of alternative measures essential to efficient provision of health safety and the environment is correct valuation of risks to human health in a world of scarcity difficult decisions concerning tradeoffs between health and other desirables are unavoidable in this paper we develop a model of health investment under uncertainty which yields a general expression for values of changes in risks to human health the preference based values of morbidity risks and mortality risks are ex ante dollar equivalents of changes in expected utility associated with risk changes the preference based values are related to two alternative measures costs of illness and preventive expenditures which are thought to be lower bounds on the value of risk reductions we demonstrate that these alternative measures are not even special cases of the more general measure and that the size relationships among the three measures are complex also we derive the relationship between the willingness to pay for risk changes and the consumer surpluses associated with health changes which occur with certainty the next section contains a brief review of the approaches to valuing changes in health

tinbergen and tipping points could some thresholds be policy induced abstract thresholds and tipping points that are characteristic of dynamic multi stability are increasingly prominent touchstones of the science policy interface prior economic work has shown thresholds arising in convex concave ecological models that exclude humans may disappear in models of coupled economic ecological systems when economic agents are included as part of the system less well understood is how this result may depend on the ability of humans to manage complex systems we examine the role of institutions that condition the available management choices we find institutional restrictions do not generate non convexities when the ecological system is well behaved but that these restrictions may generate non convexities when the ecological system is convex concave these results are tied to the concept of path controllability which is when managers have sufficient controls to guide the system across the state space path controllability is the dynamic version of the tinbergen rule and generally requires separate controls to manage each possible ecological externality we link the concepts of ecosystem externalities thresholds and path controllability to provide new economic insights into problems with the potential for multi stability and we illustrate the importance of institutions for managing convex concave systems

economic incentives for managing filterable biological pollution risks from trade infectious livestock disease problems are biological pollution problems prior work on biological pollution problems generally examines the efficient allocation of prevention and control efforts but does not identify the specific externalities underpinning the design of efficiency enhancing policy instruments prior analyses also focus on problems where those being damaged do not contribute to externalities we examine a problem where the initial biological introduction harms the importer and then others are harmed by spread from this importer here the externality is the spread of infection beyond the initial importer this externality is influenced by the importer s private risk management choices which provide impure public goods that reduce disease spillovers to others making disease spread a filterable externality we derive efficient policy incentives to internalize filterable disease externalities given uncertainties about introduction and spread we find efficiency requires incentivizing an importer s trade choices along with self protection and abatement efforts in contrast to prior work that targets trade alone perhaps surprisingly we find these incentives increase with importers private risk management incentives and with their ability to directly protect others in cases where importers can spread infection to each other we find filterable externalities may lead to multiple nash equilibria

livestock disease indemnity design when moral hazard is followed by adverse selection averting or limiting the outbreak of infectious disease in domestic livestock herds is an economic and potential human health issue that involves the government and individual livestock producers producers have private information about preventive biosecurity measures they adopt on their farms prior to outbreak ex ante moral hazard and following outbreak they possess private information about whether or not their herd is infected ex post adverse selection we investigate how indemnity payments can be designed to provide incentives to producers to invest in biosecurity and report infection to the government in the presence of asymmetric information we compare the relative magnitude of the first and second best levels of biosecurity investment and indemnity payments to demonstrate the tradeoff between risk sharing and efficiency and we discuss the implications for status quo u s policy

the stochastic rotation problem a generalization of faustmann s formula to stochastic forest growth abstract in the present paper we study the optimal cutting strategy 1 2 for an ongoing forest by using stochastic impulse control we show how faustmann s formula can be generalized to stochastic growing forests the paper extends and clarifies previous studies by miller and voltaire 1983 clarke and reed 1989 and reed and clarke 1990

spatial renewable resource extraction under possible regime shift how will countries harvesting mobile natural resources react to the possibility of regime shift we address the non cooperative exploitation of a migratory renewable resource in the presence of possible regime shift that affects its movement motivated by the anticipated effects of climate change we model a regime shift that will alter the spatial movement patterns of the resource at some point in the future we develop a stochastic spatial bioeconomic model to address the effects of this class of regime shift on non cooperative harvest decisions made by decentralized owners such as countries exploiting a migratory fish or other natural resource stock we find that the threat of a future shift modies the standard golden rule and may induce more aggressive harvest everywhere irrespective of whether the owner will be advantaged or disadvantaged by the shift we also identify conditions under which the threat of regime shift induces owners to reduce harvest rates in advance of the shift our analysis suggests that different property rights structures single ownership vs common property or heterogeneous growth can give rise to previously unexplored incentives and can even reverse conventional wisdom about how countries will react to the prospect of future environmental change

mitigating strategies for carbon dioxide problems society can take steps to enhance our ability to adapt more easily to carbon dioxide induced changes given the rapidity of social and technological change in the twentieth century facilitating adjustment is important with the exception of data collection and analysis focused on climate enhancing each of these functions will be to the general benefit of society but will not be unique to carbon dioxide induced problems carbon dioxide issues can provide a rationale but more probably will be a catalyst for pushing society to enhance its ability to adapt to and exploit change carbon dioxide is but one of many factors which will have an enormous impact on the economic and social institutions of the united states in the twenty first century if carbon dioxide induced changes were as large as now appears possible and if they were the only major change then it would be worthwhile to invest in enhancing education and capital formation so that we could minimize the effects of adverse changes and take advantage of beneficial ones since carbon dioxide induced changes are likely to be only one possibly small source of change there is all the more reason to devote resources to making our economic and social institutionsmore more flexible and adaptable 7 references less

energy efficiency fallacies revisited abstract a number of governments including that of the uk subscribe to the belief that a national program devoted to raising energy efficiency throughout the economy provides a costless indeed profitable route to meeting international environmental obligations this is a seductive policy it constitutes the proverbial free lunch not only avoiding politically unpopular measures like outlawing taxing or rationing offending fuels or expanding non carboniferous sources of energy like nuclear power but doing so with economic benefit the author of this contribution came to doubt the validity of this solution when it was offered as a way of mitigating the effect of the opec price hikes of the 1970 maintaining that economically justified improvement in energy efficiency led to higher levels of energy consumption at the economy wide level than in the absence of any efficiency response more fundamentally he argues that there is no case for preferentially singling out energy from among all the resources available to us for efficiency maximization the least damaging policy is to determine targets enact the restrictive measures needed to curb consumption and then leave it to consumers intermediate and final to reallocate all the resources available to them to best effect subject to the new enacted constraints and any others they might be experiencing there is no reason to suppose that it is right for all the economic adjustment following a new resource constraint to take the form of improvements in the productivity of that resource alone as many others have argued any action to impose resource constraint entails an inevitable economic cost in the shape of a reduction in production and consumption possibilities there would be no free lunch in the last few years debate about the validity of these contentions has blossomed especially under the influence of writers on the western side of the atlantic in this contribution the author outlines the original arguments for questioning whether raised efficiency leads to lower consumption reports more recent developments and offers some insights as food for further thought