option value empirical evidence from a case study of recreation and water quality a procedure for measuring option value and other preservation values of water quality is developed and applied to a case study area in the south platte river basin colorado benefits from water based recreation activities are the focus of the study the results provide an empirical test and confirmation of weisbrod s proposal that option value and other preservation values represent important social benefits and should be added to the aggregate consumer surplus of recreation activities to determine the total benefit of environmental amenities to society in the absence of such an estimate insufficient resources would be allocated by society to preservation of unique environments such as pristine mountain streams where mineral and energy development may irreversibly degrade water quality

cooperative management of groundwater resources in the presence of environmental externalities this paper investigates how cooperation among users can achieve a better management of groundwater in the presence of environmental externalities cooperation allows users to internalize the damages caused by their activities and reduce extractions the paper develops a game theoretical framework to assess the value of cooperation in an aquifer that is divided into three sub aquifers that are being overly exploited two types of externalities are modeled first water extractions in each sub aquifer impact water levels in neighboring sub aquifers extraction externality second the three sub aquifers are also connected to an ecosystem and thus decisions in each sub aquifer affect the health of the ecosystem environmental externality a cooperative game theory model is applied the model empirically shows how the uncontrolled extractions in each sub aquifer affects neighboring groundwater users but also cause severe impacts to the linked ecosystem the model is tested empirically in one of the most important aquifers in spain the eastern la mancha aquifer the results illustrate how both extraction and environmental externalities interact in affecting the likelihood of cooperation among the users the paper estimates the value of cooperation and its stability with and without the environmental externality

heavy tails and copulas limits of diversification revisited we show that diversification does not reduce value at risk for a large class of dependent heavy tailed risks the class is characterized by power law marginals with tail exponent no greater than one and by a general dependence structure which includes some of the most commonly used copulas

speculative bubbles in bitcoin markets an empirical investigation into the fundamental value of bitcoin amid its rapidly increasing usage and immense public interest the subject of bitcoin has raised profound economic and societal issues in this paper we undertake economic and econometric modelling of bitcoin prices as with many asset classes we show that bitcoin exhibits speculative bubbles further we find empirical evidence that the fundamental price of bitcoin is zero

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

separability partial demand systems and consumer s surplus measures abstract in practice complete demand systems are not estimated rather either an incomplete demand system is estimated or separability is invoked and a partial demand system is estimated this paper considers the relationship between the conventional compensating variation equivalent variation and the corresponding welfare measure that can be derived from a partial demand system and the current budget allocation to the separable group even assuming the separability assumption invoked is appropriate these partial measures provide in general only a limited amount of information about the compensating variation and no information about the equivalent variation great care is therefore needed when using partial welfare measures to evaluate policy

volatility estimation for bitcoin a comparison of garch models we explore the optimal conditional heteroskedasticity model with regards to goodness of fit to bitcoin price data it is found that the best model is the ar cgarch model highlighting the significance of including both a short run and a long run component of the conditional variance

booms busts and heavy tails the story of bitcoin and cryptocurrency markets abstract we develop bespoke rational bubble models for bitcoin and cryptocurrencies that incorporate both heavy tails and the probability of a complete collapse in asset prices empirically we present robustified evidence of bubbles in bitcoin and ethereum theoretically we show that liquidity risks may generate heavy tails in bitcoin and cryptocurrency markets even in the absence of bubbles dramatic booms and busts can occur we thus sound a timely note of caution

value at risk and expected shortfall in cryptocurrencies portfolio a vine copula based approach risk management is an important and helpful process for investors hedge funds traders and market makers one of its key points is the appropriate estimation of risk measures which can improve the

valuation and management of wetland ecosystems we recently completed a study of wetland values in coastal louisiana that employed both willingness to pay and energy analysis based methodologies and were able to bracket a range of values within which we feel fairly confident the true value lies however a large amount of uncertainty remains our current estimates of the total prsent value of an average acre of natural wetlands in louisiana are us 2429 6400 per acre assuming an 8 discount rate to 8977 17000 per acre assuming a 3 discount rate at the lowest value the current annual rate of loss of louisiana wetlands 50 sq miles per year is worth about 77 million at the largest value it is worth about 544 million in this paper we a discuss the fundamental theoretical and practical problems underlying natural resources valuation b summarize our methods and findings for louisiana wetlands and c elaborate on some of the more recalcitrant problems attending applied natural resource valuation including discounting and dealing with uncertainty and imprecision the discount rate makes more difference in the final result than any other one factor and yet there is much disagreement about the appropriate approach to discounting natural resources we discuss the discounting problem as applied to natural resources and argue for lower discount rates for valuing renewable natural resources than apply for other aspects of the economy it now seems clear that no reasonable amount of effort will produce very precise estimates of wetland values and we suspect this is also the case for several other classes of natural resources we elaborate a wetlands asurance bonding system to address these problems

ecological economic analysis of wetlands scientific integration for management and policy abstract wetlands all over the world have been lost or are threatened in spite of various international agreements and national policies this is caused by 1 the public nature of many wetlands products and services 2 user externalities imposed on other stakeholders and 3 policy intervention failures that are due to a lack of consistency among government policies in different areas economics environment nature protection physical planning etc all three causes are related to information failures which in turn can be linked to the complexity and invisibility of spatial relationships among groundwater surface water and wetland vegetation integrated wetland research combining social and natural sciences can help in part to solve the information failure to achieve the required consistency across various government policies an integrated wetland research framework suggests that a combination of economic valuation integrated modelling stakeholder analysis and multi criteria evaluation can provide complementary insights into sustainable and welfare optimising wetland management and policy subsequently each of the various components of such integrated wetland research is reviewed and related to wetland management policy

measuring sustainable welfare a new approach to the isew abstract sustainability and welfare assessment is a contemporary theme of major scientific and policy relevance requiring the consideration of multiple dimensions and diverse perspectives the economic approach to sustainability and welfare assessment has frequently relied on alternatives or adjustments to gdp widely used as an indicator of macroeconomic performance several authors have proposed alternative indicators such as the isew which intend to measure sustainability and economic welfare in a way that avoids the limitations of gdp namely accounting for the value of externalities the distribution of income and natural resources depletion since daly and cobb 1989 there have been proposed improvements to the isew however its aptitude to represent a sound alternative to gdp is still the subject of scientific debate this paper presents a new approach to the isew named modified isew including new components and methodological changes for the estimation of the index these have the purpose of avoiding some of the index shortcomings and allow for a direct comparison with the gdp which are advantages over previous studies an application is developed for the us case taking advantage of wide data availability and the possibility of comparing the results with previous works the results obtained provide a clearer picture of the success or failure of environmental and social policies namely by avoiding the tampering effect resulting from the cumulative accounting of environmental externalities this work also emphasizes the inadequacy of gdp as a welfare indicator as well as the need to develop and adopt alternative indicators

do focus groups and individual interviews reveal the same information for natural resource valuation abstract focus groups and individual interviews have become accepted methods used in the initial stages of valuation research whether focus groups and individual interviews reveal similar valuation information has not been thoroughly studied the research tests the hypothesis that focus groups yield the same ecosystem service information as do individual interviews the research also explores how the focus group and individual interview data might differ the analysis shows that focus groups and individual interviews are not substitutes they yield different information about ecosystem services and resource uses

price clustering in bitcoin investor and media attention in bitcoin has increased substantially in recently years reflected by the incredible surge in news articles and considerable rise in the price of bitcoin given the increased attention there little is known about the behaviour of bitcoin prices and therefore we add to the literature by studying price clustering we find significant evidence of clustering at round numbers with over 10 of prices ending with 00 decimals compared to other variations but there is no significant pattern of returns after the round number we also support the negotiation hypothesis of harris 1991 by showing that price and volume have a significant positive relationship with price clustering at whole numbers

combining revealed and stated preference methods to value environmental amenities at residential locations this paper combines an established revealed preference method discrete choice he donic analysis and a relatively new stated refer ence method choice based conjoint analysis in order to estimate more accurately the aesthetic benefits generated by the presence and quality of environmental amenities associated with residen tial locations it applies the combined approach to the housing market of fairfield connecticut which contains several environmental amenities and is experiencing an improvement in the quality of its coastal wetlands due to active restoration efforts jel q26

some economics of global warming the greenhouse effect itself is simple enough to understand and is not in any real dispute what is in dispute is its magnitude over the coming century its translation into changes in climates around the globe and the impacts of those climate changes on human welfare and the natural environment these are beyond the professional understanding of any single person the sciences involved are too numerous and diverse demography economics biology and the technology sciences are needed to project emissions atmospheric chemistry oceanography biology and meteorology are needed to translate emissions into climates biology agronomy health sciences economics sociology and glaciology are needed to identify and assess impacts on human societies and natural ecosystems and those are not all there are expert judgments on large pieces of the subject but no single person clothed in this panoply of disciplines has shown up or is likely to this article makes an attempt to forecast the economic and social consequences of global warming due to anthropogenic greenhouse gases and attempting to prevent it

global warming discounting is not the issue but substitutability is the cost benefit study of nordhaus 1994 is representative for the neoclassical approach towards global warming nordhaus found that no substantial emission cuts are warranted most of his critics have concentrated on the issue of discounting and demanded that a lower discount rate should be applied these criticisms first miss the point and second lead to ethically dubious inconsistent conclusions and inefficient policy choices they miss the point because the real problem of nordhaus s methodology is his implicit underlying assumption of perfect substitutability between natural and other forms of capital given the validity of this assumption lowering the rate of discount is inconsistent with current savings behaviour is ethically dubious because future generations will be much richer than the current one anyway and is inefficient because scarce financial resources are channelled into emissions abatement that exhibits rates of return far inferior to alternative public investments any call for aggressive emission abatement must therefore directly attack the perfect substitutability assumption of neoclassical economics the real disagreement is about whether consumption growth can compensate for environmental degradation caused by global warming discounting is not the issue but substitutability is

does ecological economics have a future contradiction and reinvention in the age of climate change abstract this paper addresses the role of neoclassical methodologies in ecological economics and the contradictions these methodologies pose to the field s critical founding principles we first consider robert costanza s treatment of nicholas stern s global deal and then survey climate change related articles published in this journal over the past five years this survey reveals how mainstream neoclassical methodologies dominate discourse and do so by marginalizing more critical political economy analyses this situation imperils the field s founding vision of a no growth steady state it also fails to address the related growth dynamics of capitalism without such a critical treatment the field s formal embrace of methodological pluralism actually entails an ideological empiricism that renders ecological economics theoretically incoherent this situation undermines the field s historical promise as an alternative economic paradigm ecological economics now faces a problematic future its survival in a form faithful to its founding vision will require an explicit choice to address its internal contradictions and reinvent itself in ways relevant to our contemporary context without such a choice ecological economics will likely succumb to an implicit acceptance of the hegemony of mainstream economic methodologies and their pro growth imperatives

optimal vs naive diversification in cryptocurrencies abstract this paper contributes to the literature on cryptocurrencies by examining the performance of naive 1 n and optimal markowitz diversification in a portfolio of four popular cryptocurrencies we employ weekly data with weekly rebalancing and show there is very little to select between naive diversification and optimal diversification our results hold for different levels of risk aversion and an alternative estimation window

optimal climate policy is a utopia from quantitative to qualitative cost benefit analysis abstract the dominance of quantitative cost benefit analysis cba and optimality concepts in the economic analysis of climate policy is criticised among others it is argued to be based in a misplaced interpretation of policy for a complex climate economy system as being analogous to individual inter temporal welfare optimisation the transfer of quantitative cba and optimality concepts reflects an overly ambitious approach that does more harm than good an alternative approach is to focus the attention on extreme events structural change and complexity it is argued that a qualitative rather than a quantitative cba that takes account of these aspects can support the adoption of a minimax regret approach or precautionary principle in climate policy this means implement stringent ghg reduction policies as soon as possible

estimating intertemporal preferences for natural resource allocation in this article we show how the degree of risk aversion discounting and preference for intertemporal substitution for a natural resource manager can be structurally estimated within a recursive utility framework we focus on the management of a reservoir in california and test the data for consistency with a recursive utility model specification versus standard time additive separability the results show that the data are consistent with a risk averse manager with recursive preferences the data also reject time additive separability with or without risk aversion such as the standard constant relative risk aversion utility model the improvement in model fit when recursive preferences are used is notable natural resource management problems are typically stochastic and dynamic in nature by virtue of the characteristics of the underlying physical or biological processes that govern the evolution of the resource this has been the reason for a number of empirical applications of dynamic programming within the natural resource literature as chronicled by williams however the tendency of researchers to use risk neutral expected net present value epv objective functions when modeling natural resource problems has caused policy makers to be somewhat skeptical of the real world relevance of resource economics analysis 1 given the uncertainty facing the decision maker in each period of the planning horizon due to the realization of stochastic shocks we would expect risk aversion and intertemporal substitution to feature prominently in the characterization of intertemporal preferences

the inefficiency of bitcoin revisited a dynamic approach abstract this letter revisits the informational efficiency of the bitcoin market in particular we analyze the time varying behavior of long memory of returns on bitcoin and volatility 2011 until 2017 using the hurst exponent our results are twofold first r s method is prone to detect long memory whereas dfa method can discriminate more precisely variations in informational efficiency across time second daily returns exhibit persistent behavior in the first half of the period under study whereas its behavior is more informational efficient since 2014 finally price volatility measured as the logarithmic difference between intraday high and low prices exhibits long memory during all the period this reflects a different underlying dynamic process generating the prices and volatility

return and volatility spillovers among cryptocurrencies abstract this paper measures interdependencies among 18 major cryptocurrencies and shows that i bitcoin is the dominant contributor of return and volatility spillovers among all the sampled cryptocurrencies ii return and volatility spillovers have risen steadily over time iii there are spikes in spillovers during major news events regarding cryptocurrencies these findings suggest growing interdependence among cryptocurrencies and by extension a higher degree of contagion risk it may be the case that cryptocurrencies are becoming more integrated albeit this makes for interesting future empirical testing in addition the time varying nature of spillovers reveals a certain dimension of uncertainty regarding the future of these digital currencies

sustainability economics general versus specific and conceptual versus practical we clarify the definition and interpretation of sustainability economics baumgartner and quaas 2010 in response to recent comments by van den bergh 2010 bartelmus 2010 and others for that sake we distinguish between general and specific definitions of sustainability and sustainability economics as well as between conceptual and practical approaches

the costs of carbon sequestration a revealed preference approach increased concem by policy makers with the threat of global climate change has brought with it considerable attention to the possibility of encouraging the growth of forests as a means of sequestering carbon dioxide national academy of sciences nas 1992 james p bruce et al 1996 1 the kyoto protocol to the united nations framework convention on climate change 1997 which establishes emission reduction targets for the united states and other industrialized nations states that carbon sequestration can be used by participating nations to achieve their targets moreover even before the kyoto agreement this approach had become an explicit element of both u s and intemational climate policies u s department of energy 1991 united nations general assembly 1992 william j clinton and albert gore 1993 this high level of interest has been due in part to suggestions that sufficient lands are available to use the approach to mitigate a substantial share of annual carbon dioxide c02 emissions greg marland 1988 daniel a lashof and dennis a tirpak 1989 mark c trexler 1991 and claims that growing trees to sequester carbon is a relatively inexpensive means of combating climate change roger a sedjo and allen m solomon 1989 daniel j dudek and alice leblanc 1990 nas 1992 in other words the serious attention given by policy makers to carbon sequestration can partly be explained by implicit assertions about respective marginal cost functions i develop and demonstrate a method by which the costs of carbon sequestration can be estimated on the basis of evidence from landowners behavior when confronted with the opportunity costs of alternative land uses the simplest of previous economic analyses derived single point estimates of average costs associated with particular sequestration levels marland 1988 sedjo and solomon 1989 dudek and leblanc 1990 edwin s rubin et al 1992 omar masera et al 1995 often it has been assumed that land opportunity costs are zero g van kooten et al 1992 j k winjum et al 1992 new york state energy office 1993 robert k dixon et al 1994 another set of studies essentially engineering costing models has constructed marginal cost schedules by using information on revenues and costs of production for altemative uses on representative types or locations of land and then sorting these in ascending order of cost robert j moulton and kenneth r richards 1990 richards et al 1993 simulation models include a model of the lost profits due to removing land from agricultural production peter j parks and ian w hardie 1995 a mathematical programming model of the agricultural sector and the timber market richard m adams et al 1993 a related model incorporating the effects of agricultural price support programs j m callaway and bruce mccarl 1996 and a dynamic simulation model of forestry susan swinehart 1996 lastly an analysis by andrew j plantinga 1995 adopts land use elasticities from an econometric study to estimate sequestration costs we draw on some of the best features of the previous studies including the carbon levelization method of moulton and richards john f kennedy school of government harvard university 79 john f kennedy street cambridge ma 02138 and resources for the future richard newell supplied excellent research assistance and valuable comments on a previous version were provided by lawrence goulder william nordhaus andrew plantinga kenneth richards two anonymous referees participants in seminars at the universities of california at los angeles and santa barbara the university of maryland the university of michigan the university of texas harvard university stanford university yale university resources for the future and the national bureau of economic research the author alone is resdonsible for any errors 1 after fossil fuel combustion deforestation is the second largest source of carbon dioxide emissions estimates of annual global emissions from deforestation range from 0 6 to 2 8 billion tons compared with slightly less than 6 0 billion tons annually from fossil fuel combustion cement manufacturing and natural gas flaring combined r a houghton 1991 t m smith et al 1993

the inefficiency of bitcoin bitcoin has received much attention in the media and by investors in recent years although there remains scepticism and a lack of understanding of this cryptocurrency we add to the literature on bitcoin by studying the market efficiency of bitcoin through a battery of robust tests evidence reveals that returns are significantly inefficient over our full sample but when we split our sample into two subsample periods we find that some tests indicate that bitcoin is efficient in the latter period therefore we conclude that bitcoin in an inefficient market but may be in the process of moving towards an efficient market

an application of extreme value theory to cryptocurrencies we study the tail behaviour of the returns of five major cryptocurrencies by employing an extreme value analysis and estimating value at risk and expected shortfall as tail risk measures we find that bitcoin cash is the riskiest while bitcoin and litecoin are the least risky cryptocurrencies

entitlements missing markets and environmental uncertainty reply abstract at one level dore and ward seem intent on immunizing received doctrine they say that i did not prove that rights violated nozick s principles of justice and that i did not prove that missing markets were the problem more telling they allege i did not prove that my story was better than the particular story favored by dore and ward that is they argue that there is an alternative approach based on the theory of public economics which is indeed operational 3 they then use the bulk of their comment to explain and defend this alternative model they hope to convince the reader that the model of public economics survives intact in the face of my alternative model to the extent that their model allows one to define the problem away it is not difficult to see why they find it so compelling more seriously dore and ward fail to make a coherent argument about the concept of rights and duties and the logic of a particular rights structure that happens to prevail they seem concerned that my article was tampering with some sacred social construct the status quo rights structure and that my article threatened the received wisdom of both public economics and paretian walrasian bliss indeed theirs seems to be a genuine fear that if economists release their grip on the certitude of received orthodoxy the floodgates will be open to all manner of bumbling regulators seeking to shift rights and wealth positions across generations my article is apparently threatening because it seems to suggest that the received wisdom may at times be misleading

taxes subsidies and insurance as drivers of united states coastal development abstract ever increasing coastal populations in the united states and worldwide are putting growing quantities of people and property at risk due to coastal disasters at the same time poorly planned development policies and practices erode the natural capital of coastal regions eliminating existing landscape protection from intense wind and waves government tax subsidy and insurance policies can encourage or discourage particular forms of development in the u s there is no consistent set of incentives or disincentives for coastal development and many programs have ambiguous or contradictory goals federal programs are highly fragmented being administered by a variety of government agencies state and local governments can also implement policies to improve coastal disaster protection but often fail to do so in other cases state and local policies designed for local economic growth work against the goals of federal policy increasing flood damage risk while relying on federal aid once disaster does strike these programs frequently lead to perverse subsidies where economically inefficient policies degrade natural capital and foster economic inequality in this study we evaluate the existing tax subsidy and insurance structures that led to coastal development patterns on the u s gulf coast over the last sixty years and propose alternative policies that could create a more sustainable just economically efficient and storm adaptive region

optimal diversity increasing returns versus recombinant innovation abstract choices regarding diversity play an important role in economics and innovation management but often remain implicit once made explicit the objectives of efficiency and diversity are usually posed as in conflict as efficiency relates positively and diversity negatively to various increasing returns to scale in markets such a perspective however neglects the benefits of diversity in terms of realizing system improvements through recombinant innovation or spillovers the latter implies a contribution of diversity to long term efficiency dominant economic approaches that address diversity such as option value and real options theories regard benefits of diversity as exogenous this paper proposes a simple model of variable endogenous diversity to analyse the optimal balance between increasing returns to scale and recombinant innovation it is discussed under which conditions one of four solutions is optimal complete specialization regardless of which option complete specialization in one specific option symmetric diversity perfect balance and asymmetric diversity the results give rise to a number of policy insights

the value of a watershed as a series of linked multiproduct assets abstract this paper views ecosystem as long lived multiproduct factories increased use of one ecosystem good or service function often affects the supplies of other ecosystem functions the relationships between these functions can be modeled in terms of key variables related to ecosystem management thus the analyst can determine the different mixes of functions an ecosystem can perform watersheds can be viewed as a series of ecosystems linked spatially and temporally by the downward flow of water changes in the mix of upstream ecosystem functions change the mix of downstream ecosystem functions the paper presents an approach to valuing one ecosystem as a multiproduct factory using consumer surplus the author then proceeds to apply the same methodology to a watershed viewed as a series of linked multiproduct assets because the flow of water closely links upstream and downstream ecosystems a watershed can be treated as one unit and valued accordingly however this approach obscures a question of particular interest if erosion in an upstream ecosystem causes it to lose value but in turn causes the wetlend downstream to gain value does the value of the watershed rise or not the paper examines this issue in terms of boundaries redundancy and defensive expenditures sustainability and other factors which must be considered in the economic valuation of the watershed

efficiency sustainability and global warming abstract economic analyses of global warming have typically been grounded in the theory of economic efficiency such analyses may be inappropriate because many of the underlying concerns about climate change are rooted not in efficiency but in the intergenerational allocation of economic endowments a simple economic model is developed which demonstrates that an efficient economy is not necessarily a sustainable economy this result leads directly to questions about the policy relevance of several economic studies of the issue we then consider policy alternatives to address global warming in the context of economies with the dual objectives of efficiency and sustainability with particular attention to carbon based taxes

on the inefficiency of bitcoin abstract urquhart 2016 investigated the market efficiency of bitcoin by means of five different tests on bitcoin returns it was concluded that the bitcoin returns do not satisfy the efficient market hypothesis we show here that a simple power transformation of the bitcoin returns do satisfy the hypothesis through the use of eight different tests the transformation used does not lead to any loss of information

carbon sequestration and the optimal management of new hampshire timber stands abstract this paper explores the tradeoff between resource extraction and net carbon sequestration in managing representative timber stands in the state of new hampshire in the northeastern united states in the absence of policies to promote forest carbon storage land owners have incentives to employ clear cut harvesting regimes with relatively short rotation periods under conservative assumptions regarding the social benefits of carbon storage optimal rotation periods are extended by between 16 and 133 years depending on the forest type under consideration if policy makers pursued a cost effective strategy to stabilize atmospheric carbon dioxide concentrations at twice the pre industrial norm optimal rotation periods would be extended by a full 180 347 years the analysis suggests that partial harvesting regimes in which approximately 35 of timber volume is removed at 15 year intervals after the timber stand reaches an initial age of 45 years provide relatively high net benefits under a variety of circumstances this finding is relevant because partial harvesting is an accepted and relatively common practice that could be adopted more widely

the economics of urban afforestation insights from an integrated bioeconomic health model abstract urban afforestation programs are starting to act on the growing body of evidence that nature and greenspace are important determinants of well being however there are a lack of credible investigations into the long term returns on investment of afforestation inclusive of positive and negative externalities project related costs and dynamic environmental feedbacks using the new york city forest canopy as an example our integrated bioeconomic health model illustrates that investments in afforestation produce per planted tree net benefits that are significantly lower than previous similarly comparable estimates 12 vs 172 and are nonlinear in canopy size we also show that a reduction in urban air quality such as those that may be produced by changes in national air quality policies and enforcement can be mitigated through increased investment in urban afforestation our results have significant public policy implications for urban environmental quality initiatives

optimal forest rotation with in situ preferences abstract this study develops a utility maximization infinite horizon forest rotation model that includesin situvalues and the forest owner s consumption savings decision making the value of forest land becomes owner specific and depends on property rights related toin situbenefits the length of the rotation period depends e g on the wealth of the forest owner and may evolve in time a forest owner with accumulating nonforest assets never continues harvesting forever in contrast with decreasing nonforest assets the rotation period converges toward the faustmann solution in a multiple stand version of the model the harvesting decisions regarding different stands are linked together via the budget constraint and the dependence of an individual stand sin situvalue on the age structure of the whole forest numerical simulation with two stands suggests that within the class of concavein situvaluation functions the optimal solution yields convergence toward forests with increasing heterogeneity of age structures

a bibliometric account of the evolution of ee in the last two decades is ecological economics becoming a post normal science abstract in ecological economics the debate on formalism and formalization has been addressed in the context of a lively discussion on ecological economics as a post normal versus normal science using ecological economics ee as a seed journal and applying bibliometric techniques to all 2533 the articles published in ee from january 1989 to december 2009 we analyze the evolution of the field of ecological economics aiming to shed light on this debate we observe the predominance and increased relevance of certain research topics methodological issues policies governance and institutions and valuation moreover collective action technical change and the environment and values stand as emergent themes of research finally we note that ecological economics experienced an empirical turn reflected in a shift away from exclusively formalized papers towards exclusively empirical and to a larger extent formal and empirical ones the combination of the prominent and emergent topics and the empirical turn mirrors the increasing awareness among researchers in the field of the need to address a key specificity of ecological economics the interdependence of the economic biophysical and social spheres on this basis we argue that at least through the lens of ee ecological economics has evolved towards a post normal science

the incremental cost principle and the conservation of globally important habitats a critical examination abstract this paper examines the application of the incremental cost ic principle for the conservation of globally important habitats it first describes the characteristics of the ic and how it became an important financial modality in multilateral conservation efforts the application of the ic is then examined taking into account characteristics of successful collaboration efforts for the global environment the paper finds that as currently applied the ic fails to be a robust financial mechanism for protection of globally important habitats it also heavily skews the bulk of conservation costs from developed to developing countries the paper concludes with a description of suggested changes to make the ic an effective tool in global conservation efforts

a flexible assurance bonding system for improved environmental management abstract current methods of regulating activities that are known or suspected to be environmentally danaging are not working well they induce legal confrontation obfuscation and government intrusion into the inner workings of firms they tend to suppress technical and social innovation aimed at long term solutions they do not mesh well with the market signals that firms use to make decisions this paper discusses some of the underlying reasons for this problem and outlines a flexible environmental assurance bonding system designed to incorporate environmental criteria and uncertainty into the market system and to induce positive environmental technological innovation in addition to direct charges for known environmental damages an assurance bond equal to the current best estimate of the largest potential future environmental damages would be levied and kept in an interest bearing escrow account the bond plus a portion of the interest would be returned if and only if the firm could prove that the suspected damages had not occured or would not occur if damages did occur the bond would be used to rehabilitate or repair the environment and to compensate injured parties by requiring the users of environmental resources to post a bond adequate to cover potential future environmental damages with the possibility for refunds the burden of proof is shifted from the public to the resource user and a strong economic incentive is provided to research the true costs of environmentally innovative activities and to develop innovative cost effective pollution control technologies

consumer s surplus without apology the purpose of this paper is to settle the controversy surrounding consumer s surplus and by so doing to validate its use as a tool of welfare economics i will show that observed consumer s surplus can be rigorously utilized to estimate the unobservable compensating and equivalent variations the correct theoretical measures of the welfare impact of changes in prices and income on an individual i derive precise upper and lower bounds on the percentage errors of approximating the compensating and equivalent variations with consumer s surplus these bounds can be explicitly calculated from observable demand data and it is clear that in most applications the error of approximation will be very small in fact the error will often be overshadowed by the errors involved in estimating the demand curve the results in no way depend upon arguments about the constancy of the marginal utility of income consequently this paper supplies specific empirical criteria which can replace the apologetic caveats frequently employed by those who presently apply consumer s surplus moreover the results imply that consumer s surplus is usually a very good approximation to the appropriate welfare measures to preview below i establish the validity of these rules of thumb for a

ecosystems contingent valuation and ethics the case of wetland re creation this paper addresses a current issue in environmental valuation namely the extent to which environmental preferences depart from the usual economic paradigm to incorporate some lexicographic elements after a theoretical discussion the paper reviews attempts to explore this question empirically by supplementing contingent valuation analyses with an exploration of the motives behind willingness to pay responses including zero bids and refusals to answer this is followed by the presentation of new evidence investigating respondents willingness to pay for the creation of a wetland taken from 713 personal interviews of the british public 2000 elsevier science b v all rights reserved

trust law sustainability and responsible action abstract the problem of managing for sustainability is marked by the need to make decisions on behalf of others and by the uncertainties that attend such decisions however the economic literature on sustainability has paid scant attention to how decisions on behalf of others might differ from decisions on behalf of oneself and when risk has been modeled explicitly the expected utility hypothesis has generally been used a generation acts sustainably if the expected value of the next generation s utility is not less than the present s this paper investigates how we think about responsibly acting on another s behalf by looking to the united states law of trusts because in important respects the current generation views its responsibility to the future as a trust relationship trust law illuminates responsible decision making under both risk and uncertainty even under conditions of risk more conservative action than would be suggested by the expected utility hypothesis is warranted because it emphasizes preservation of trust principal and disavows profit maximization trust doctrine indicates that special caution should be exercised in conditions of uncertainty finally resource economic concepts of strong sustainability the precautionary principle and the safe minimum standard of conservation are interpreted according to trust principles

the choice of the distribution of asset returns how extreme value theory can help abstract one of the issues of risk management is the choice of the distribution of asset returns academics and practitioners have assumed for a long time for more than three decades that the distribution of asset returns is a gaussian distribution such an assumption has been used in many fields of finance building optimal portfolio pricing and hedging derivatives and managing risks however real financial data tend to exhibit extreme price changes such as stock market crashes that seem incompatible with the assumption of normality this article shows how extreme value theory can be useful to know more precisely the characteristics of the distribution of asset returns and finally help to chose a better model by focusing on the tails of the distribution an empirical analysis using equity data of the us market is provided to illustrate this point

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

specifications of social welfare in economic studies of climate policy overview of criteria and related policy insights an important assumption in economic studies of climate policy is the social welfare function this paper shows that applying distinct decision or social welfare criteria can result in different optimal policies of climate control notably if climate change impacts are uncertain first decision criteria in current climate economic studies are reviewed next the most important alternatives are discussed including their mathematical formalization and incorporation in economy climate models most of these alternative criteria suggest more stringent climate policies to be optimal than the standard discounted utilitarianism approach however several important welfare criteria have not or hardly seen any application in the economic analysis of climate policy we conclude that there is clear need for systematic research on this theme for which the current review provides a solid basis

tail relation between return and volume in the us stock market an analysis based on extreme value theory abstract using daily data of the s p 500 index from 1950 to 2015 we investigate the relation between return and transaction volume in the statistical distribution tails associated with booms and crashes in the us stock market we use extreme value theory peaks over threshold method to study the extreme dependence between the two variables we show that the extreme correlation between return and volume decreases as we consider larger events in both the left and right distribution tails from an economic viewpoint this paper contributes to a better understanding of the activity of market participants during extreme events our empirical result is consistent with the economic explanation by gennotte and leland 1990 of extreme price movements based on misinterpretation of trades by market participants

option value an exposition and extension this article examines the role of the discount rate in making decisions that will have significant implications for the environment the authors begin by providing a rationale for discounting in general and by describing the main factors that determine

integration of environmental concerns into economic analyses of projects and policies in an operational context abstract the efficient use of natural resources both mineral and biological as well as man made capital and human resources is a vital prerequisite for economic and social development one key role of ecological economics is to help value environmental and natural resources more precisely and internalize the cost and benefits of using such resources into the decision making process this paper reviews current economic approaches to the analysis of projects and policies and discusses possibilities for better intergrating environmental concerns into public decision making it reviews current practices as they relate to project analysis the analysis of economic policies and national income accounting a major need at present is not for more theory or techniques but for application of existing methodology and approaches to concrete problems particularly in developing countries the major objective should not be to provide fine turned numbers but to indicate orders of magnitude some project and policy alternatives can be ruled out in this fashion also one can often identify the key estimates to which the decision is sensitive and focus more refined analyses on them cost benefit analysis should be used to the extent possible alongside one needs to consider and to the extent possible rigorously analyze consequences and risks that cannot be measured in monetary terms and use for example multi criteria analysis where possible this together with sound judgement are at present the best inputs into decision making

valuation for renewable energy a comparative review abstract environmental cost benefit analysis is applied for the evaluation of renewable energy projects since some benefits and costs do not have monetary values economic valuation techniques are applied to estimate them this paper reviews the literature on the valuation evaluation of renewable energy resources and summarizes the methods used in them it discerns four main streams of valuation in renewable energy the first is economic welfare oriented and comprises stated and revealed preference methods the second is the financial option analysis with a financial background the third is emergy analysis which is mostly an ecological engineering based method with capable economic links and the fourth is again economic but not welfare based the paper discusses the main directions discerned in these studies and recognizes first that proper valuation takes place only in the first method while the other methods describe only evaluation procedures and second that there is a research gap that has yet to be filled in as compared to other areas of environmental resource and energy economics

bequests credit rationing and in situ values in the faustmann pressler ohlin forestry model the problem of determining the optimal time to stop the pure aging process has a 150 year history in forestry the success of the rotation model lies in the fact that it is taken to be theoretically sound empirically testable and has clear practical relevance nonetheless empirical findings show that timber supply depends on variables missing from the original formulation previous research has addressed the problem by abandoning the pure aging description of forests this study demonstrates that the optimal aging process becomes forest owner specific under imperfect land and capital markets and if the owner has in situ preferences

long term substitutability between environmental and man made goods abstract substitutability between environmental and man made goods plays a major role in the sustainability debate the notion of substitutability covers a continuous spectrum with perfect substitutability at one end and poor substitutability at the other in this paper it is shown that if economic growth sustains a sharp distinction emerges between perfect and poor substitutability without any intermediate interpretation of substitutability if poor substitutability prevails environmental resources will eventually constitute the major part of total consumption value we relate our results to baumol s disease and assess the implications of this phenomenon for the compensation of environmental losses

the role of property rights in economic research on u s wetlands policy abstract the purpose of this essay is to define the role of resource economics in the development of u s wetlands policy i argue that the optimal pollution model based on maximation of net benefits of wetland protection is for the most part not directly applicable to the creation of wetlands policy for two reasons 1 the delineation of property rights among wetland owners and the general public as opposed to the maximization of net benefits is the more fundamental political issue and therefore drives policy making 2 the predominant public benefits of wetlands fall into the economic category of nonuse values which are very difficult to define and measure in a policy relevant way and the public s legal rights to them have not been established these conclusions indicate that resource economics research that focuses upon 1 the economic significance to interested parties of alternative delineations of property rights 2 development of policy tools appropriate for each possible property rights delineation and 3 the relative cost effectiveness of these policy tools is most useful for policy making

intergenerational resource rights efficiency and social optimality the discipline of economics is generally defined as the science of the allocation of scarce resources between competing social objectives given an initial distribution of resources between economic agents how would they behave so as to improve their welfare according to the pareto criterion the agents would exchange commodities until the opportunities for fruitful exchange were fully exhausted and no agent could be made better off without rendering at least one other agent worse off pareto efficiency is a powerful concept in microeconomic analysis provided that the initial distribution of property rights is equitable allocative efficiency gives rise to the best of all possible worlds acknowledging that the assumptions of perfect competition are often violated firms are monopolistic information is incomplete and externalities exist economists have argued for the modification of institutions so that economic reality will conform more closely to the assumptions of the model that yields such gratifying results but microeconomic theory has always maintained that allocative efficiency is in itself insufficient to maximize social welfare bator 1957 a social welfare function is required to discriminate a social optimum among the array of efficient allocations that correspond to alternative assignments of property rights though economists have posited alternative functional forms for the sake of pursuing conceptual arguments welfare functions have remained elusive constructs for well known theoretical and practical reasons consequently a sharp line of demarcation has been drawn between questions of efficiency the province of economics and equity the principal focus of ethical and political discourse in resource economics however the line demarcating efficiency and equity is often crossed the term optimal depletion appears regularly where only efficient depletion is meant while political debates about resource exploitation over time are laden with questions of the proper distribution of our natural patrimony between generations resource economists have predominantly espoused particular use rules that guarantee efficiency but overlook potential improvements in social welfare achievable through the reassignment of property rights across generations we document the evolution and current status of the misuse of the term optimal depletion in section ii we develop a simple two generation three period general equilibrium model in section iii to illustrate how alternative distributions of resource rights between generations relate to alternative pareto efficient solutions in section iv we demonstrate how different social welfare functions affect the optimal solution and associated assignment of resource rights between generations

ecological economic modeling and valuation of ecosystems abstract we are attempting to integrate ecological and economic modeling and analysis in order to improve our understanding of regional systems assess potential future impacts of various land use development and agricultural policy options and to better assess the value of ecological systems starting with an existing spatially articulated ecosystem model of the patuxent river drainage basin in maryland we are adding modules to endogenize the agricultural components of the system especially the impacts of agricultural practices and crop choice and the process of land use decision making the integrated model will allow us to evaluate the indirect effects over long time horizons of current policy options these effects are almost always ignored in partial analyses although they may be very significant and may reverse many long held assumptions and policy predictions this paper is a progress report on this modeling effort indicating our motivations ideas and plans for completion

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