coalitional manipulation on networks abstract we study allocation rules that are robust to coalitional manipulation by transferring merging or splitting individual characteristics among coalition partners e g merging or splitting claims in bankruptcy problems coalition formation is restricted by an exogenous network a non directed graph so that only connected subsets of agents can form a coalition we offer a full characterization of non manipulable rules without any assumption on the network structure this result yields a variety of useful corollaries for specific networks such as complete network trees and networks without a bridge and corollaries for specialized models dealing with bankruptcy surplus sharing cost sharing income redistribution social choice with transferable utility etc

sharing the proceeds from a hierarchical venture we consider the problem of distributing the proceeds generated from a joint venture in which the participating agents are hierarchically organized we introduce and characterize a family of allocation rules where revenue bubbles up in the hierarchy the family is flexible enough to accommodate a no transfer rule where no revenue bubbles up and a full transfer rule where all the revenues bubble up to the top of the hierarchy intermediate rules within the family are reminiscent of popular incentive mechanisms for social mobilization our benchmark model refers to the case of linear hierarchies but we also extend the analysis to the case in which hierarchies may convey a general tree structure and include joint ownerships

intergenerational equity the capital environment trade off abstract this paper examines the trade off between capital accumulation and environmental quality that determines an intergenerationally equitable program according to the rawls maximin criterion this trade off is explored by an analysis of regular maximin programs in the framework developed by brock this results in a constant utility path supported by competitive prices with government imposed effluent charges and environmental rentals sufficient conditions for a regular maximin path to satisfy a hartwick rule in deciding on the combination of capital and environmental quality left to future generations are given

nonrenewable resource scarcity nonrenewable resource theory often is summarized by hotelling s rule this paper reviews theoretical extensions and empirical investigations of resource extraction models observed data are often inconsistent with the hotelling rule suggesting that other characteristics of nonrenewable resource supply including exploration heterogeneous ore quality technological progress and capital investment are important determinants of the dynamic behavior of resource prices given the persistent recurrence of concern about nonrenewable resource scarcity measures of nonrenewable resource scarcity and the empirical evidence for the time trends of those measures are reviewed finally the implications of nonrenewable resource scarcity for economic growth are examined

pollution control and the ramsey problem pollution is an inevitable by product of production and is only gradually dissolved by the environment it can be reduced by producing less and by cleaning up the environment but neither occur when they are left to the market cleaning activities and the optimal emission charges increase with the stock of pollutants when one allows for pollution of the environment in the classical ramsey problem the capital stock is less than in the market outcome and a fortiori less than under the golden rule the analysis distinguishes between stock and flow externalities arising from pollution an increase in impatience can lead to more capital accumulation even though this leaves less room for current consumption

sources of aggregate labour productivity growth in canada and the united states abstract in this paper we propose a decomposition technique to examine the sources of industrial contribution to aggregate labour productivity growth we show that in terms of pure labour productivity growth the manufacturing and service sectors contributed equally to the aggregate canada u s labour productivity growth gap during the 1987 98 period but in terms of total industrial contributions which also take into account the contributions from a change in relative size the service sector was the largest contributor we also find that high labour productivity growth industries did not attract resources from stagnant industries a phenomenon consistent with baumol s cost disease of stagnant industries jel classification o47 c43

non manipulable division rules in claim problems and generalizations abstract when resources are divided among agents the characteristics of the agents are taken into consideration a simple example is the bankruptcy problem where the liquidation value of a bankrupt firm is divided among the creditors based on their claims we characterize division rules under which no group of agents can increase the total amount they receive by transferring their characteristics within the group by allowing agents characteristics to be multi dimensional and choosing the meaning of variables appropriately our model can subsume a number of existing and new allocation problems such as cost sharing social choice with transferable utilities income redistribution bankruptcy with multiple types of assets probability updating and probability aggregation a number of existing and new results in specific problems are obtained as corollaries

endogenous future preferences and conservation a dynamic optimization model is developed in whichuncertainty about future preferences is endogenous namely depending on the state of the environment atthe time the change in preferences occurs endogeneizing preferences not only provides economicintuition to previous results but also implies thatoptimal policies are less conservative

global warming economics in the long run a conceptual framework economic models of climate change typically analyze its short run effects for example up to the year 2100 or for a doubling of atmospheric co2 this is a potentially serious shortcoming since under a business as usual scenario atmospheric co2 concentrations could more than quadruple we introduce a framework that endogenously accounts for long run climate change and examine the implications of alternative mitigation strategies one in which the rates of annual emissions are reduced and one that places absolute limits on the total amount of carbon released we discuss alternative valuation frameworks drawing on the debate surrounding the stern review

resource rents the effects of energy taxes and quantity instruments for climate protection abstract carbon dioxide emissions correspond to fossil resource use when considering this supply side of climate protection crucial questions come to fore it seems likely that owners of fossil resources would object to emission reductions moreover policy instruments such as taxes may not be effective at all it seems individually rational to leave no fossil resources unused in this context it can be expected that economic sectors will react strategically to climate policy aiming at a re distribution of rents to address these questions we investigate the effectiveness efficiency and resource rents for energy taxes resource taxes and quantity rationing of emissions the analysis is based on a game theoretic growth model with explicit factor markets and policy instruments market equilibrium depends on a government that acts as a stackelberg leader with a climate protection goal we find that resource taxes and quantity rationing achieve this objective efficiently energy taxation is only second best the use of quantity rationing to achieve climate protection generates substantial rents for resource owners

climate change industrial transformation and environmental growth traps this paper examines the potential interactions in the global economy between the impacts of climate change on productivity with existing technology and increasing returns in the development of less vulnerable and lower emission technology a simple specification is used in which the global economy can produce a single homogeneous consumption good with two different technologies the old technology has global diminishing returns to scale and depends on the use of fossil energy that gives rise to long lived damaging climate change the new technology has convex concave production due to set up cost and is not vulnerable to climate change through simulations we show that if output with the new technology does not grow fast enough to move through the phase of increasing returns then the economy could experience an environmental growth trap lingering at a low level of income indefinitely or achieving some progress but then getting driven back to a lower level of income by productivity reducing environmental degradation we discuss how the prospects of such a trap depend on the productivity and energy intensity of the old technology as well as the magnitude of the set up cost

optimal growth resource amenities and the preservation of natural environments this paper examines the conditions for which it is optimal to permanently preserve natural environments in which a productive natural resource is found the conditions are more restrictive than those previously indicated in the literature on the economics of natural environments increasing consumption and declining commodity prices are not sufficient to warrant permanent preservation the initial capital stock can be an important determinant of the optimal level of preservation in addition resource amenity values will increase the initial resource price and decrease the rate of growth of the resource price the natural world provides a variety of services to the human community natural resources are essential inputs in the production of goods and services in addition the natural world generates a variety of amenity services including the scientific recreational and aesthetic value of preserved natural environments krutilla 1967 krutilla and fisher 1975a this paper examines the impact of resource amenity values on the optimal growth of an economy which depends upon natural resource inputs for the production of goods and services in particular the paper examines the conditions under which it is optimal to permanently preserve some natural environments in which the productive resource is found the conditions which warrant permanent preservation are more restrictive than previously indicated by the literature on the economics of natural environments increasing consumption and declining commodity prices are not sufficient to warrant permanent preservation in addition the initial capital endowment can be an important determinant of the optimal level of preservation

sustainability and the intergenerational distribution of natural resource entitlements abstract the paper describes an olg economy with a single exhaustible resource that has amenity value the steady states of this economy form a continuum implying path dependency we compare three policy scenarios first a zero extraction policy of enforced conservation that avoids environmental degradation possibly at the expense of intertemporal efficiency second a grandfathering policy that endows the present generations with all resources and that ensures efficiency but cannot prevent a persistent decline in lifetime utility from one generation to the next third a trust fund policy where future generations receive claims for the natural resource of the three only the trust fund ensures efficiency and protects welfare of all generations

risk taking global diversification and growth this paper develops a continuous time stochastic model in which international risk sharing can yield substantial welfare gains through its effect on expected consumption growth the mechanism linking global diversification to growth is an attendant world portfolio shift from safe low yield capital to riskier high yield capital the presence of these two types of capital captures the idea that growth depends on the availability of an ever increasing array of specialized hence inherently risky production inputs calibration exercises using consumption and stock market data imply that most countries reap large steady state welfare gains from global financial integration copyright 1994 by american economic association

inequality aversion resource depletion and sustainability abstract a welfare function which incorporates aversion to inequality across generations is applied to the cake eating problem and it is shown that sustainability with positive welfare will be ensured provided that inequality aversion is sufficiently strong

industrial structure change and the widening canada us labor productivity gap in the post 2000 period canada s deterioration in labor productivity performance in the post 2000 period especially relative to the united states has been a major concern for policy makers from an industrial structure perspective this article shows that the faster loss of the manufacturing base in canada than in the united states and the deterioration in the productivity performance of canadian large manufacturing firms relative to their us counterparts were the main factors associated with the widening canada us labor productivity gap in the post 2000 period

traditional production communal land tenure and policies for environmental preservation in the south pacific abstract instead of maximizing the expected monetary return of land usage pacific islanders manage land so that it renders an optimal mix of cash income and non monetary cultural goods evidence from cropping patterns in fiji suggests that the production of these cultural goods is linked to traditional agriculture which produces less ecological deterioration than its commercial counterpart the capacity for village land to support traditional activities is highest under a regime of communal land tenure where decision making is centralized a regime of private land tenure lowers this capacity because decentralized decision making raises the coordination costs of preserving special areas of land for traditional purposes this means that if development planners rush to replace traditional regimes of communal land tenure with modern systems of private land ownership they might also observe a correlated increase in land degradation even if new codes of private property are perfectly enforceable a two sector growth model can be used to show that the welfare neutral bribe required from the government to increase the amount of village land preserved in the steady state is lower under a regime of communal land tenure one counterintuitive result is that a high subjective discount rate does not always imply a high level of environmental degradation observations from the south pacific have application for environmental policy in other developing countries

are small or large producers driving the canada u s labour productivity gap recent evidence from manufacturing this paper shows that the higher small plant employment share in canada compared with the united states mattered for the canada u s manufacturing labour productivity gap but it did not contribute to the widening of the gap between 2002 and 2007 in addition it shows that while the weaker productivity performance of small plants in canada compared with the united states accounted for much of the gap in a particular year the deterioration in the productivity performance of large plants in canada was responsible for most of the widening gap over this period resume est ce que les petits ou les grands producteurs conforment l ecart de productivite du travail entre le canada et les etats unis resultats recents pour le secteur manufacturier ce texte montre que la plus grande portion de l emploi dans les petits etablissements au canada par rapport aux etats unis est importante dans l explication de la difference de niveau de productivite du travail entre le canada et les etats unis mais que ce facteur n a pas contribue a l accroissement de l ecart entre 2002 et 2007 de plus on montre qu alors que la productivite plus faible des petits etablissements au canada par rapport aux etats unis explique le gros de l ecart pour une annee particuliere c est la deterioration de la productivite des grands etablissements au canada qui explique le gros de la croissance de l ecart au cours de cette periode

an overlapping generations model with exhaustible resources and stock pollution this paper analyzes the nexus between resource exhaustion and pollution externality using an overlapping generations framework where each generation lives only for a finite period for a finite horizon model with production where there are many agents per generation the pareto inefficiency arises due to lack of intragenerational coordination and is propagated across generations the tax rates necessary for correcting this externality are characterized we also derive a modified hotelling rule according to which the equilibrium resource price rises slower than the rate of interest in order to account for the damages due to the pollution stock generated by the resource used for the case where the externality induced damage acts on production rather than the utility function pareto inefficiency is shown to persist even when there is intragenerational coordination

on the economics of forest vintages abstract we study optimal harvesting of a multiple vintage forest system under discounting discrete time and strictly concave utility it is shown that at the optimal stationary state timber harvest may evolve cyclically over time the cycles occur because in the forest vintage model space is measured continuously and time in discrete units cycles disappear as period length moves toward zero when the faustmann rotation is not unique or when the discount factor approaches unity we develop an equivalent model that can be used to solve the vintage problem numerically from any initial state numerical examples suggest that the optimal solution converges to the stationary cycle from any initial vintage structure

renewable resource use and nonseparable amenity benefits we incorporate amenity benefits into an overlapping generations model with a renewable resource as a factor of production source of amenity benefits and store of value unlike the conventional renewable resource problems studied under the assumption of additive consumption and amenity benefits we let amenity benefits affect the utility of consumers in a nonseparable fashion we examine the role that weights given to consumption and amenities have for harvesting and the resource stock we characterize dynamics and stability of steady state equilibria with a logistic resource growth function we demonstrate in parametric and numerical models that the weights given to consumption and amenities in the utility function matter substantially for the steady state equilibrium stock and its stability and dynamics both conventional saddle point equilibria and indeterminacy with infinite number of equilibria and saddle node bifurcation is possible depending on the weights given to consumption and amenities in addition we show that for each inefficient equilibrium stock there is a unique subsidy rate that can move the economy from an inefficient equilibrium to an efficient one the presence of indeterminacy provides a challenge to resource policies because the system becomes unpredictable therefore expectations and market psychology may play an important role in resource utilization and provision of amenities

a theoretical basis for the environmental kuznets curve abstract this paper attempts to explain the environmental kuznets curve ekc or inverted u shaped relationship between income and environmental degradation in the framework of endogenous growth model considering a closed economy one part of capital is used for commodity production which generates pollution that degrades existing environment and the remaining part is used for abating pollution i e upgrading environment sufficient abatement activity improves restores environmental quality a sufficient abatement activity associated with commodity production could only lead optimally towards steady state the ratio of allocation of capital between two sectors production and abatement is fixed along the optimal path but it varies along the non optimal path that exists in the off steady state in the economy allocation of capital for abatement activity varies over time thus a change from insufficient to sufficient allocation of capital i e investment for abatement activity is the basis for an inverted u shaped relationship between environmental quality and economic growth

hierarchical outcomes and collusion neutrality on networks abstract we investigate tu game solutions that are neutral to collusive agreements among players a collusive agreement binds collusion members to act as a single player and is feasible when they are connected on a network collusion neutrality requires that no feasible collusive agreement can change the total payoff of collusion members we show that on the domain of network games there is a solution satisfying collusion neutrality efficiency and null player property if and only if the network is a tree considering a tree network we show that affine combinations of hierarchical outcomes demange 2004 van den brink 2012 are the only solutions satisfying the three axioms together with linearity as corollaries we establish characterizations of the average tree solution equally weighted average of hierarchical outcomes one established earlier in the literature and the others new

optimal transition to backstop substitutes for nonrenewable resources abstract we analyze the optimal transition from a primary nonrenewable resource to a backstop substitute for a class of problems characterized by the property that the backstop cost decreases continuously as learning from r d efforts accumulates to increase the knowledge base the transition policy consists of the r d process and of the time profiles of the primary and backstop resource supply rates we find that the optimal r d process follows a most rapid approach path mrap the knowledge process associated with r d should approach some endogenously derived target process as rapidly as possible and proceed along it thereafter thus if the initial knowledge level is sufficiently low and the cost structure justifies r d activities the r d efforts should be initiated without delay at the highest affordable rate and slow down later on this pattern contrasts previous findings that typically recommend a single humped r d process with a possible initial delay

ecological economics and scientific controversies lessons from some recent policy making in the eec abstract contrasting the very limited scientific evidence on the forest dieback issue with the sudden adoption of policies on air pollution decided in the frg 1983 1984 and extended to the european community 1985 we propose an interpretative framework for the real internalization process at work in what was tantamount to a social crisis for public opinion the media and political actors we conclude that open scientific controversies on some environmental issues effects causes solutions pave the way for some actors to use the issue for their own techno industrial strategies quite alien to ecological constraints in cases of very high uncertainties on impacts it becomes impossible to apply conventional social cost benefit analysis scba as an optimizing tool we propose to develop economic analysis as a negotiation language and to give pride of place to the value of learning time and to the crucial role of technological pluralism as a condition for flexibility in the future

uncertainty and amenity values in renewable resource economics in this paper we study the effects of amenities and uncertainty on the optimal exploitation of a renewable resource first if society displays a protection motive in the presence of amenities its optimal harvesting strategy will be more conservative second we show that ecological uncertainty leads society to develop the opposite behavior thus reducing its exposition towards risk a stationary analysis is undertaken to analytically quantify and compare these two effects with a gompertz natural regeneration function and a proportional risk the amenity effect is proved to prevail if and only if stochastic fluctuations on the resource stock are not too large

is there really a green paradox abstract in the absence of a co2 tax the anticipation of a cheaper renewable backstop increases current emissions of co2 since the date at which renewables are phased in is brought forward and more generally future emissions of co2 will decrease the effect on global warming is unclear green welfare falls if the backstop is relatively expensive and full exhaustion of fossil fuels is optimal but may increase if the backstop is sufficiently cheap relative to the cost of extracting the last drop of fossil fuels plus marginal global warming damages as then it is attractive to leave more fossil fuels unexploited and thus limit co2 emissions we establish these results by analyzing depletion of non renewable fossil fuels followed by a switch to a clean renewable backstop paying attention to timing of the switch and the amount of fossil fuels remaining unexploited we also discuss the potential for limit pricing when the non renewable resource is owned by a monopolist finally we show that if backstops are already used and more backstops become economically viable as the price of fossil fuels rises a lower cost of the backstop will either postpone fossil fuel exhaustion or leave more fossil fuel in situ thus boosting green welfare however if a market economy does not internalize global warming externalities and renewables have not kicked in yet full exhaustion of fossil fuel will occur in finite time and a backstop subsidy always curbs green welfare

common trends and drivers of co2 emissions and employment a decomposition analysis in the industrial sector of selected european union countries the countries of the european union face the challenge of reversing the declining role of industry and achieving their targets for sustainable development combining industrial growth with fewer environmental repercussions and more jobs this paper uses a decomposition analysis in order to quantify the effect of the driving factors on two indicators of sustainable industrial development co2 emissions and employment in five european union countries during 2000 2011 the decomposition method applied is the log mean divisia index i and the models developed comprise some common or closely related driving factors the parallel investigation of the factors affecting the two indicators offers useful insights into relevant complementary and or antithetical effects the timeframe of the study is divided into two time periods before and after the start of the economic crisis 2000 2007 and 2007 2011 respectively this time division enables the evaluation of the impacts of the economic crisis directly on the drivers and indirectly on the two indicators it was deduced that in both time periods the two main drivers of industrial co2 emissions and employment were economic growth and resource intensity which counterbalance each other structural changes appeared to have a rather marginal effect even if the general tendency was the expansion of less energy labour intensive sectors finally changes in the fuel mix used in industry were beneficial to emissions reduction in all the examined countries especially in the second time period the results obtained show that the examined eu countries have not found a solid path towards sustainable and inclusive industrial development yet the stronger economies seem to move faster to this direction though

manipulation through bribes we consider allocation rules that choose outcomes and transfers based on agents reported valuations of the outcomes a bribing situation exists when one agent could pay another to misreport his valuations resulting in a net gain to both a bribe proof rule eliminates such opportunities we show that under a bribe proof rule each agent s payoff is a continuous function of other agents reported valuations furthermore on connected domains if the set of outcomes is finite or the domain is smoothly connected each agent s payoff is a constant function of other agents reports finally under a domain richness condition a bribe proof rule must be constant the results apply to a broad class of economies journal of economic literature classification numbers c70 d70

the supply side of co2 with country heterogeneity several recent articles have analyzed climate policy paying explicit attention to the fact that carbon resources are non renewable in most of this body of literature the economy is treated as a single unit and in the context of climate policy it seems reasonable to interpret this as the whole world however carbon taxes and other climate policies differ substantially across countries with such heterogeneity the effects on the emission paths of changes in taxes costs and subsidies might be very different from what is found for a hypothetical world of identical countries

scarcity growth and r d abstract the limits to economic growth due to resource scarcity can be alleviated only by the development of backstop substitutes this paper combines resource based economic growth with r d to reduce the cost of backstop technologies characterizing the entire dynamics of optimal growth and r d processes we find that an economy s growth prospects depend on its type as determined by its production technology and learning ability and by its knowledge capital endowment a wide variety of growth patterns emerges ranging from cases in which an economy that without r d eventually stagnates converges to a steady state is diverted by r d onto a path of sustained growth to cases in which r d is not warranted resource scarcity is shown to encourage r d due to the increased reliance on the backstop technology

environmental economics an evolutionary critique and a plea for pluralism abstract environmental economics is a contradiction in terms the contradiction is intuitive to the puzzled lay person inquiring about the nature of our subdiscipline it is explicit to those who think of environmental systems in terms of complex evolving interconnectedness and identify the economic model with the atomistic and mechanistic assumptions of classical mechanics within the subdiscipline we try to resolve the contradiction by internalizing externalities by matching market feedbacks with environmental relations while acknowledging that insights can be drawn from the market view of environmental problems i argue in this essay that 1 the contradiction is nerver resolved 2 multiple incongruous perspectives are all we have for understanding the interface between economic and environmental systems and 3 environmental economics will thrive with a return to philosophical pluralism to the open acceptance of the contradiction

genuine savings and sustainability genuine savings gs has emerged as the leading economic indicator of sustainable economic development at the country level it derives from the literatures on weak sustainability wealth accounting and national income accounting we discuss the theoretical underpinnings of gs focusing on the relationship between changes in a nation s extended capital stock and the future path of consumption the indicator has entered widespread use propelled by the world bank s publications despite its varying performance as a predictor for future consumption notwithstanding the extensive body of literature reviewed promising future research avenues are identified

path dependence in a ramsey model with resource amenities and limited regeneration this paper studies a ramsey optimal control economy with one consumer good extended to include several non renewable resources with amenity value the steady state equilibria of this economy are shown to form a continuum selection of the steady state to which the economy converges depends on the initial resource stocks hence unlike the usual ramsey models our model exhibits path dependency and postponement in the introduction of resource e ciency policies has long term e ects if the resource is renewable with a limited regeneration function the continuum becomes a turnpike that is optimal paths move along it towards the unique steady state the results also hold when there are several consumers 2003 elsevier b v all rights reserved

optimal investment in clean production capacity for the mitigation of long term pollution threats one must consider that both the process of environmental degradation and the switchover to new and cleaner technologies are dynamic we develop a model of a uniform good that can be produced by either a polluting technology or a clean one the latter is more expensive and requires investment in capacity we derive the socially optimal pollution stock accumulation and creation of nonpolluting production capacity weighing the tradeoffs among consumption investment and djustment costs and environmental damages we consider the effects of changes in the pollution decay rate the capacity depreciation rate and the initial state of the environment on both the steady state and the transition period the optimal transition path looks quite different with a clean or dirty initial environment with the former investment is slow and the price of pollution may overshoot the long run optimum before converging with the latter capacity may overshoot

hartwick s rule and maximin paths when the exhaustible resource has an amenity value abstract this paper studies the maximin paths of the canonical dasgupta heal solow model when the stock of natural capital is a direct argument of well being besides consumption hartwick s rule then appears as an efficient tool to characterize solutions in a variety of settings we start with the case without technical progress we obtain an explicit solution of the maximin problem in the case where production and utility are cobb douglas when the utility function is ces with a low elasticity of substitution between consumption and natural capital we show that it is optimal to preserve forever a critical level of natural capital determined endogeneously we then study how technical progress affects the optimal maximin paths in the cobb douglas utility case on the long run path of the economy capital production and consumption grow at a common constant rate while the resource stock decreases at a constant rate and is therefore completely depleted in the very long run a higher amenity value of the resource stock leads to faster economic growth but to a lower long run rate of depletion we then develop a complete analysis of the dynamics of the maximin problem when the sole source of well being is consumption and provide a numerical resolution of the model with resource amenity the economy consumes produces and invests less in the short run if the resource has an amenity value than if it does not whereas it is the contrary in the medium and long runs however and without surprise the resource stock remains for ever higher with resource amenity than without

intergenerational discounting with intragenerational inequality in consumption and the environment it is now established that the consumption discount rate is determined by the growth of consumption multiplied by the elasticity of marginal utility but distributive concerns are rarely reflected in the literature assuming a social welfare function with inequality aversion we consider a consumption discount rate that can be decomposed into the growth effect and the intragenerational distribution effect the framework is then extended to include population change and inequality in the environment as an amenity in a utility with constant elasticity of substitution numerical examples illustrate that distributional effects turn non negligibly negative that may reduce consumption discount rate by 1 3 for plausible parameters once distribution is adjusted for both population and the environment

towards an ecological economics of sustainability abstract persistent disagreement both as to the interpretation to be given to sustainability and as to the relation between ecological and economic sustainability has hindered the development of an ecological economics of sustainable resource use this paper identifies the main concepts of sustainability deriving from the two disciplines in order to explore the difference implied by an ecological approach to the problem it is argued that present economic and ecological approaches are largely disjoint and that they address basically different phenomena by combining the efficiency requirements of what is usually thought of as economic sustainability with the stability requirements of an ecological approach it is shown that an intertemporally efficient allocation of resources that satisfies the conditions for constant levels of consumption is not necessary to assure ecological sustainability ecological sustainability requires that the allocation of economic resources should not result in the instability of the economy environment system as a whole

efficiency of conservationist measures an optimist viewpoint abstract we consider an economy with a consumer good capital a natural resource that provides amenity values and heterogeneous overlapping generations we compare a benchmark grandfathering policy that ensures efficiency through privatization with a policy of enforced resource conservation it is shown that i conservationist measures do not cause any pareto inefficiency irrespective of whether they pass a cost benefit test moreover it is shown that ii there exist pareto optimal allocations that can only be reached through resource conservation and not through competitive markets irrespective of compensating income transfers finally iii equivalence is demonstrated between strict resource conservation and non dictatorship of the present generations over future generations as formalized in chichilnisky s sustainable welfare function the results are shown to hold in both a first best and a second best setting

too much coal too little oil abstract our main message is that it is optimal to use less coal and more oil once one takes account of coal being a backstop which emits much more co2 than oil the way of achieving this is to have a steeply rising carbon tax during the initial oil only phase a less steeply rising carbon tax during the intermediate phase where oil and coal are used alongside each other and the following coal only phase and a flat carbon tax during the final renewables only phase the laissez faire outcome uses coal forever or starts with oil until it is no longer cost effective to do so and then switches to coal we also analyze the effects on the optimal transition times and carbon tax of a carbon free albeit expensive backstop solar or wind energy subsidizing renewables to just below the cost of coal does not affect the oil only phase the gain in green welfare dominates the welfare cost of the subsidy if the subsidy gap is small and the global warming challenge is acute without a carbon tax a prohibitive coal tax leads to less oil left in situ and substantially delays introduction of renewables but curbs global warming substantially as coal is never used finally we characterize under general conditions what the optimal sequencing oil and coal looks like

global environmental risks the need to manage climate risks is not a new it has shaped social institutions for many centuries in medieval england a peasant farmer s land was broken into many widely dispersed parcels economic historians interpret this as a way of hedging climate risk see references in bromley 9 land in different locations would be affected differently by droughts floods and frosts by spreading land holdings over different locations as well as by organizing agricultural cooperatives and buying insurance farmers have managed climate risk for many centuries

intertemporal valuation in an unpredictable environment abstract the inherent unpredictability of ecological systems is a vital feature for the development of theories at the interface between economics and ecology such unpredictability is caused by instabilities that are intrinsic parts of ecosystem function succession and evolution the complexity of ecological dynamics undermines the simple probabilistic treatment of uncertainty based on the equilibrium paradigm common in traditional environmental economics we investigate an important alternative by representing the dynamics of the biogeophysical system as an infinite sequence of instabilities this leads to a stochastic process exhibiting an exponentially growing variance our analysis is carried out in a macroeconomic setting in a situation where the value system here formalized in terms of risk averse social welfare functions contains at least two distinct aspects consumption rate and the state of the environment the central variables for intertemporal valuation i e the time dependent expected values of the two welfare function components are calculated using the probability distribution describing the environmental dynamics one result is that if the unpredictability of the environmental dynamics is taken into account then the social discount rate for environmental existence values may well be negative

the effects of ageing and an environmental trust fund in an overlapping generations model on carbon emission reductions most currently employed integrated assessment models for climate change are of a dynastic nature they employ the ramsey rule linking the interest rate economic growth and the rate of pure time preference this paper argues that although a dynastic framework might be convenient for economic analysis it is restrictive and can be misleading overlapping generations models which do not employ the ramsey rule are more flexible and may give results different from those derived from dynastic models with the integrated assessment model alice 2 0 it is shown how various assumptions on demographic change and public institutions can affect the interest rate thereby influencing the efficient greenhouse gas emission reductions it is concluded that dynastic integrated assessment models are in many respects inappropriate for providing policy makers with quantitative figures about the costs of carbon dioxide emissions and their desirable reduction levels 2001 elsevier science b v all rights reserved

climate policy and the optimal extraction of high and low carbon fossil fuels we study how restricting co2 emissions affcts resource prices and depletion over time we use a hotelling style model with two nonrenewable fossil fuels that differ in their carbon content e g coal and natural gas and that are imperfect substitutes in final good production we study both an unexpected constraint and an anticipated constraint both shocks induce intertemporal substitution of resource use when emissions are unexpectedly restricted it is cost effective to use high carbon resources relatively more less intensively on impact if this resource is relatively scarce abundant if the emission constraint is anticipated it is cost effective to use relatively more less of the low carbon input before the constraint becomes binding in order to conserve relatively more less of the high carbon input for the period when climate policy is active in case the high carbon resource is relatively scarce abundant

transitional impacts of environmental policy in an endogenous growth model to explore the link between a tighter environmental policy and economic growth the authors employ an endogenous growth model with endogenous technological progress in abatement technologies the environment which is modelled as a renewable resource acts both as a public consumption good and as a public input into production the entire transition towards a new balanced growth path after a tightening of environmental policy is computed analytically the authors find sharp contrasts between short run and long run effects whereas the level and the growth rate of output may decline in the short run income growth may improve in the long run copyright 1996 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

a dynamic analysis of human welfare in a warming planet anthropogenic greenhouse gas ghg emissions have caused atmospheric concentrations with no precedents in the last half a million years inducing serious uncertainties about future climates and their effects on human welfare recent climate science supports the view that the climate stabilization will require very low ghg emissions in the future we ask is a path of low emissions compatible with sustainable levels of human welfare with steady growth in human quality of life addressing these questions requires both defining welfare criteria and empirically estimating the possible paths of the economy we specify and calibrate a dynamic model with four intertemporal links education physical capital knowledge and the environment in line with nordhaus 2008a and with the stern review 2007 we assume that ghg emissions allow increased production while a higher stock of atmospheric carbon decreases production our index of human welfare which we call quality of life quol emphasizes education knowledge and the environment affected by greenhouse gas emissions in addition to consumption and leisure thus we avoid a consumptionist fallacy that welfare depends only on commodity consumption and perhaps leisure we reject discounted utilitarianism as a normative criterion and consider two alternatives the first is an intergenerational maximin criterion which maximizes the quality of life of the first generation subject to maintaining at least that level for all successive generations the second is human development optimization that seeks the maximization of the quol of the first generation subject to achieving a given constant rate of growth in all subsequent generations hence our analysis focuses on a human notion of sustainability as opposed to the conventional green sustainability limited to keeping the quality of the environment constant because our dynamic optimization programs defy explicit analytical solutions our approach has been computational as a benchmark we consider a simple model with physical and human capital for which we prove a turnpike theorem we then devise a computational algorithm inspired by the turnpike property to construct feasible although not necessarily optimal paths in the more complex and realistic model our analysis indicates that with ghg emission paths entailing very low emissions in the future positive rates of growth in quol are possible while the first generation experiences a quol higher than the historical reference level we also observe a tradeoff between the quality of life of the first generation and the rate of growth in the quality of life yet generation 1 s sacrifice for the sake of a higher growth rate appears to be small the paths that we compute involve investments in knowledge at noticeably higher levels than in the past

renewable resources and economic sustainability a dynamic analysis with heterogeneous time preferences abstract in recent years there has been increasing interest in the study of economic sustainability and its relationship with natural resources this paper attempts to shed some light on the issue by taking into account the individual variations in time preferences for consumption and resource amenity we characterize the long run steady state analyze its asymptotic stability and explore the transational dynamics from any initial state the welfare implications of the optimal path are also discussed

induced innovation and energy prices this paper uses u s patent data from 1970 to 1994 to study the impact of energy prices on energy efficient innovations theories of technological change have focused both on demand side factors which spur innovative activity by increasing the value of new innovations and supply side factors such as scientific advancements that make new innovations possible data on demand side factors are easily obtained but data on supply side factors that influence innovation are not readily available this paper uses patent citations as a measure of the usefulness of the existing base of scientific knowledge citations to previous patents are used to construct productivity estimates which measure the usefulness of the existing stock of knowledge to inventors in a given energy field for any given year these estimates are then combined with data on demand side factors to estimate a model of induced innovation in energy technologies the results indicate that both energy prices and the supply of knowledge have strongly significant positive effects on innovation the paper concludes with a discussion of the implication of this work for environmental policy

optimal dynamic carbon taxes in a climate economy model with distortionary fiscal policy how should carbon be taxed as a part of fiscal policy the literature on optimal carbon pricing often abstracts from other taxes however when governments raise revenues with distortionary taxes carbon levies have fiscal impacts while they raise revenues directly they may shrink the bases of other taxes e g by decreasing employment this article theoretically characterizes and then quantifies optimal carbon taxes in a dynamic general equilibrium climate economy model with distortionary fiscal policy first this article establishes a novel theoretical relationship between the optimal taxation of carbon and of capital income this link arises because carbon emissions destroy natural capital they accumulate in the atmosphere and decrease future output consequently this article shows how the standard logic against capital income taxes extends to distortions on environmental capital investments second this article characterizes optimal climate policy in sub optimal fiscal settings where income taxes are constrained to remain at their observed levels third this article presents a detailed calibration that builds on the seminal dice approach but adds features essential for a setting with distortionary taxes such as a differentiation between climate change production impacts e g on agriculture and direct utility impacts e g on biodiversity existence value the central quantitative finding is that optimal carbon tax schedules are 8 24 lower when there are distortionary taxes compared to the setting with lump sum taxes considered in the literature

fossil fuels stock externalities and backstop technology the hotelling exhaustible resource model is extended to include stock pollution and nonpolluting backstop technology it is shown that an optimal energy consumption strategy typically includes a regime in which the two energy sources are consumed simultaneously along this regime fossil fuel consumption decreases and backstop consumption increases together fossil fuel and backstop consumption may form eleven optimal regime combinations a decrease in the backstop price decreases the initial level of optimal emission tax

the economics of the climate i review the economic characteristics of the climate problem focusing on the choice of discount rates in the presence of a stock externality risk and uncertainty ambiguity and the role of integrated assessment models iams in analyzing policy choices i suggest that iams can play a role in providing qualitative understanding of how complex systems behave but are not accurate enough to provide quantitative insights arguments in favor of action on climate issues have to be based on aversion to risk and ambiguity and the need to avoid a small but positive risk of a disastrous outcome

alternative approaches to economic environmental interactions abstract the key questions raised by recent developments in resource and environmental economics have been what useful economic functions does the environment provide and how are these functions affected by the process of economic environmental interaction this paper distinguishes between two different formal approaches to answering these questions the more conventional approach which is concerned with the optimal allocation of economically valuable exhaustible resources and an alternative analysis that considers the trade off between on the one hand environmental quality and on the other resource depletion and waste generation by the economic process to illustrate and extend the latter approach a model is constructed to show how this trade off might lead to continuously declining environmental quality and a future ecological constraint society must therefore optimally allocate output between consumption and services to improve the environment and choose between increased capital accumulation and environmental degradation although strict application of such a model may be limited it has wider implications for the role of technological change and the value of the environment in any system experiencing deteriorating environmental quality

sustainable development renewable resources and technological progress conflicts between optimality and sustainability are typical in the literature on sustainable development using the capital resource growth model pezzey and withagen 1998 scandinavian journal of economics 100 2 513 527 have proved that if natural resources are exhaustible the time path of consumption is single peaked declining from some point in time onwards this paper extends the model to include technical progress resource renewability extraction costs and population growth the main result is that for any constant returns to scale technology optimal paths can be sustainable only if the social discount rate does not exceed the sum of the rates of resource regeneration and augmentation the development of resource saving techniques is crucial for sustaining consumption per capita in the long run whereas capital depreciation and extraction costs are neutral with respect to this sustainability condition

searching for sustainability the poverty of spontaneous order abstract traditional approaches to sustainability rely on models that depend upon judgments of welfare across future generations right prices and some sense as to what future persons will find giving of utility these models both accept the spontaneous order of market processes and rely on that order to derive optimal consumption paths into the future sustainability is however not a problem of divining optimal paths predicated upon right prices rather sustainability to be operational requires a prior constructed order predicated upon rights for future persons and duties for those now living who sit in a position as dictator over the settings and circumstances that will be passed on to future persons rights based approaches to sustainability do not rely upon unknowable preferences of future persons but rather upon an environmental regency in which those now living agree to preserve settings and circumstances for the future this reminds us that the issue of sustainability concerns not how much to preserve but what to preserve

the time path of scarcity rent in the theory of exhaustible resources there is now a consensus in the literature on resource economics that a depletable resource should command a price in excess of its marginal extraction cost simply to reflect the opportunity cost of using a unit of it today rather that conserving it for the future but how this excess is to change along an optimal or competitive equilibrium path of resource use is still an unresolved question this might at first seem puzzling since according to the fundamental theorem of economics of exhaustible resources or hotelling i 93 i rule on an optimal path price minus marginal extraction cost also termed interchangeably as scarcity rent user cost or royalty should steadily grow over time at the social rate of discount however the literature contains sharply contrasting views on the subject for example kay and mirrlees 1975 have argued that since along an optimal path the scarcity rent grows exponentially as a finite stock of a resourcexnears exhaustion then situations in which the resource stock is still very large and yet the price greatly exceeds the marginal extraction cost should indicate that the price is significantly above its optimal level and that the resource is overconserved in stark contrast to this view heal i976 has argued that as the resource stock nears exhaustion the difference between price and marginal cost or what he termed social cost of extraction falls monotonically to zero hanson i980 analyses the same model as heal s but unlike heal who assumes the unit extraction cost to be convex he postulates it to be concave and yet like heal concludes that the scarcity rent will be monotonically declining over time solow and wan i976 analyse a still different situation where resource deposits differ in quality and the unit extraction cost increases as higher grade deposits are exhausted and extraction proceeds to lower grades they show that along an optimal path the shadow price of a resource must rise at the real rate of interest despite differential extraction costs but that the difference between price and the marginal extraction cost or what they call degradation charge declines monotonically over time to zero these sharply differing conclusions suggest that far from being resolved the question of how scarcity rent changes over time is much in want of a close scrutiny the need for such a scrutiny becomes even stronger once it is noted

the cost of climate policy in the united states abstract we re evaluate prospects for us economic growth and the likely costs of advanced technologies given recent developments and then apply the mit emissions prediction and policy analysis eppa model to evaluate three core ghg policy scenarios for the us that cap emissions at different levels the three policy scenarios involve allowance allocations that through 2050 are 1 constant at present emissions levels 2 linearly reduced to 50 below present 3 linearly reduce emissions to 80 below present the cumulative allowance allocations over the horizon of the policy are 287 203 and 167 gt of co 2 equivalent respectively we compare the results to previous analysis of these same policy scenarios to evaluate how the changed growth and technology prospects affect the results we focus on 203 and 167 gt scenarios because current proposals envision deep cuts in emissions from present the 167 gt scenario is closest to proposals currently being considered by congress and supported by the us administration however we do not attempt to model specific details of actual proposals we test results to alternative assumptions about program coverage and banking behavior measured in terms of changes in economic welfare the economic cost of 203 and 167 gt cases is in the range of 2 to 3 by 2050 with co 2 prices between 48 and 67 in 2015 rising to between 190 and 266 by 2050 implementation details matter when an idealized economy wide cap and trade is replaced by coverage omitting some sectors or if the credibility of long term target is weak limiting banking behavior prices and welfare costs change substantially

irreversibility and uncertainty cause an intergenerational equity efficiency trade off abstract two important policy goals in intergenerational problems are pareto efficiency and sustainability i e intergenerational equity we demonstrate that the pursuit of these goals is subject to an intergenerational equity efficiency trade off our analysis highlights two salient characteristics of intergenerational problems and policy i temporal irreversibility i e the inability to revise one s past actions and ii uncertainty of future consequences of present actions in human environment systems we employ a two non overlapping generations model that combines an intragenerational production decision on the use of circulating capital and a non renewable resource with a negative intergenerational externality as an unforeseen contingency if initially unknown problems become apparent and policy is enacted after irreversible actions were taken policy making faces a fundamental trade off between ex post pareto efficiency and sustainability that is one can achieve either one of these two goals but not both

the conditions for achieving environmentally sustainable development this paper is interested in the narrower interpretation the relationship between environmental quality and sustainable economic activity the latter is interpreted as that level of economic activity which leaves the environmental quality level intact with the policy objective corresponding to this notion being the maximization of net benefits of economic development subject to maintaining the services and quality of natural resources over time 3

growth renewables and the optimal carbon tax optimal climate policy is investigated in a ramsey growth model of the global economy with exhaustible oil reserves an infinitely elastic supply of renewables stock dependent oil extraction costs and convex climate damages four regimes can occur depending on the initial social cost of oil being larger or smaller than that of renewables and depending on the initial oil stock being large or small we also offer some policy simulations for the first and second regime which illustrate that with a lower discount rate more oil is left in situ and renewables are phased in more quickly we identify the conditions under which the optimal carbon tax rises or decreases subsidizing renewables without a carbon tax induces more oil to be left in situ and a quicker phasing in of renewables but oil is depleted more rapidly initially the net effect on global warming is ambiguous abstract from author

limits to substitution and irreversibility in production and consumption a neoclassical interpretation of ecological economics abstract there are many methodological approaches within ecological economics one of the principal modes of analysis is a modified version of the standard neoclassical model this paper examines the parallels which emerge between the ideas of some ecological economists concerning production and the ideas of others concerning consumption when these ideas are interpreted in the neoclassical paradigm it is well known that ecological economics is characterized by arguments concerning limits to substitution between inputs energy natural capital etc vs manufactured capital labor etc in production and the implications these have for sustainability however various authors have also expressed concerns regarding limits to substitution in consumption either between environmental assets and other goods or between basic needs commodities and other goods though the specific reasons for non substitution are different in the production and consumption cases the underlying theme is that individual commodities and other inputs have unique physical or other properties which make them poor substitutes ideas about irreversibility in production and economic development are also prominent in ecological economics likewise many authors have argued for similar irreversibilities in consumption behavior in analogy to the term technological change i coin the term preferential change to describe these phenomena the linking themes in this case are that the economy environment system is evolutionary in character and that external effects intended and unintended consequences of actions or processes imposed on other parties or resources are all pervasive

a characterization of sustainability with indicators abstract economists favor the use of criteria to characterize sustainability in practice policy makers use indicators i e measurements based on the current economic state and decisions representing given sustainability issues in this paper i introduce a criterion characterizing sustainability with indicators and thresholds acting as constraints i interpret the thresholds as minimal rights to be guaranteed to all generations and define sustainable trajectories as those satisfying all the constraints at all times the new criterion is a generalized maximin criterion the approach is applied to a simple production consumption economy with non renewable resources to derive some policy recommendations on the use of indicators to deal with sustainability i discuss the implications of such a criterion in terms of trade off between sustainability thresholds efficiency and time consistency in particular the resulting problem is time inconsistent and sustainability thresholds may be revised over time following the time inconsistent policy based on indicators with dynamic revision of the thresholds may however result in a sustained utility path and even in utility growth