interpreting measures of economic loss evidence from contingent valuation and experimental studies abstract from the standpoint of conventional welfare theory it is surprising that responses to contingent valuation studies of environmental goods have shown a consistent difference between willingness to pay and compensation demanded measures of economic loss this paper examines these results in light of four reasons most often given as grounds for their dismissal new experimental evidence supports an interpretation of the observed disparity in payment and compensation based measures as both real and psychologically meaningful an alternative conceptual framework suggested by prospect theory is outlined and its relevance for economic assessments of potential environmental change is discussed briefly

a review of wta wtp studies abstract willingness to accept wta is usually substantially higher than willingness to pay wtp these constructs have been studied for roughly 30 years and with a wide variety of goods this paper reviews those studies we find that the less the good is like an ordinary market good the higher is the ratio the ratio is highest for non market goods next highest for ordinary private goods and lowest for experiments involving forms of money a generalization of this pattern holds even when we account for differences in survey design ordinary goods have lower ratios than non ordinary ones we also find that ratios in real experiments are not significantly different from hypothetical experiments and that incentive compatible elicitation yields higher ratios

valuing non market goods using contingent valuation abstract contingent valuation is a technique being developed by economists for the valuation of environmental commodities not traded in markets this paper discusses the major problem areas associated with this method of value estimation these comprise bias strategic hypothetical and design biases the discrepancy between willingness to pay and compensation demanded the aggregation procedure the choice of question format and non use values some evidence from comparative studies is reported and comments made on the accuracy of contingent valuation answers finally the conditions under which contingent valuation seems to operate best are set out

publicly vested values for fish and wildlife comment meyer s conclusion from these four observations is that natural resource asset services must loom large in individual utility functions indeed he implicitly ranks the loss of public recreational opportunity on a qualitative par with loss of home family or other important components of living quality p 228 other scholars for example dwyer and bowes 1978 have reacted differently to these same observations they conclude that weakness in the survey instruments eliciting wts responses seems likely p 1009 meyer himself touches on this area which i would characterize as that of strategic behavior he says quoting from another of his papers while it has long been recognized by theorists that the reality of an actual payment may tend to shift requests for compensation downward from initial hypothetical levels evidence from the present study raises the clear possibility that an increased reality of an actual specified injurious impact may tend to shift requests for compensation upward meyer 1978 p 20 an alternative explanation then for the four observations above is that the apparent conflict arises from strategic responses to survey questions asking about wtp and wts the strategic considerations involved may be characterized as follows

valuing environmental commodities some recent experiments a general model of consumer behavior is proposed to assess six recent experiments that have attempted to reveal preferences for environmental goals each experiment used a mix of both the techniques and the theory of demand for non market commodities and each was designed to estimate a non market attitude associated with the environment and to analyze potential biases in the techniques the six cases show some consistency in results the linkage within the contingent market between the environmental attribute institutional setting and the bidding instrument must be realistic and accepted by the respondent to avoid biased results possibly the most important result is the replication of results using a traditional property value study and a contingent bidding approach all evidence obtained to date suggests that hedonic studies of property values or wages travel costs and survey techniques all yield values well one order of magnitude in accuracy 41 references 2 tables

on the valuation of uncertainty in welfare analysis thisarticle developsa general model of private and public choice under temporal uncertainty the model incorporatesthe effectsof ris k preferencesand the pros pect of future learning into both the individual and aggregate valuationsof public projects the analys isprovidesnew ins ightson individual valuation itsimplicationsfor benefit cos t analys isand the characterization of paretoefficiency under uncertainty it also resolves some of the confusion in the option value and quasioption value literature private and public decisions typically involve many sources of uncertainty including uncertainty about prices income technology environmental quality health etc temporal uncertainty is also common where some of the risk 1 getsresolved over time due to learning additionally private and public decisions often exhibit some form of irreversibility implying that current choicescan affect the ability of decision makers to be flexible and to adjust their future choices in response to forthcoming information when uncertainty and irreversibility are both present welfare analys isgainscomplexity and importance although considerable progress has been made since weisbrod s seminal article a better understanding of the roles of uncertainty and irreversibility in welfare analys improve our ability aseconomis ts to communicate the importance of risk in project evaluation to public decision makers

identifying willingness to pay for heterogeneous goods with factorial survey methods abstract it has been difficult to estimate underlying willingness to pay parameters for attributes of heterogeneous goods such as environmental quality though hedonic price functions this paper links sociological factorial survey analysis with hedonic price analysis vignettes are multidimensional vectors constructed orthogonally differences among vignette ratings allow estimation of individual valuations of the attributes the paper establishes a theoretical framework linking the two analyses vignette and hedonic price functions are then estimated and linked at the margin to provide dollar values for marginal vignette ratings ratios of these ratings are then used to impute willingness to pay for attributes

adjustment of wages and equilibrium unemployment in a ricardian global economy abstract this paper develops a dynamic ricardian model of the world economy exhibiting endogenous wages and equilibrium unemployment it is shown that international trade serves to give workers an increased stake in job holding and in general equilibrium leads to higher real earnings and lower equilibrium unemployment economic shocks emanating in one country affect the trading partner s equilibrium unemployment rate by shifting the terms of trade the generality of the results are discussed along three dimensions replacing efficiency wages with bargaining in labor market introducing role for market sizes and factor proportion differences and introducing firm specific training to generate dynamics

the stern review a deconstruction using a simple model designed for transparency but nonetheless calibrated to support the much quoted damage estimates of the stern review of the economics of climate change we demonstrate significant sensitivity of those results to assumptions about the pure rate of time preference the time horizon and the rates of risk and equity aversion used to compute certainty and equity equivalent annuities most importantly we demonstrate enormous sensitivity to presumed constant regional vulnerability and underlying assumptions about adaptive capacity manipulation of any of these parameters one at a time across reasonable ranges can diminish damage estimates by as much as 84 or in the case of extending the time horizon with the review s low discount rate increase damage estimates by 900 we also confirm the usual result that limiting atmospheric concentrations to specific benchmarks above 400 ppm cannot eliminate all damages nonetheless we applaud the stern review author team for reconfirming that the climate problem can be approached productively as an economic problem whose solutions can be explored with the tools of decision analysis 2008 elsevier ltd all rights reserved

willingness to pay measures and expectations an experiment in studies of the willingness to pay for various environmental commodities services it is typically explicitly or implicitly assumed that the respondent has perfect has perfect foresight this paper which is based on a questionnaire completed by examining if and how the value of a hunting permit is affected by the hunter s expectations regarding the outcome of the hunting in particular the willingness to pay is estimated as a function of expected values as well as variances of different variables using a question which reflects an extension of jensen s inequality to the multivariate case as well as measures of downside risk it is shown that risk attitudes are important determinants of the willingness to pay for a hunting permit

the stern review and the costs of climate change mitigation responding to the dual critique and the tol and yohe paper in the previous issue of world economics professor anderson counters a number of assertions made in those papers including the claims that the stern review is alarmist or scaremongering biased in its estimates and was not reviewed by peers he points to a number of areas where the authors either got it wrong or seriously misrepresented the review

valuing public goods a comparison of survey and hedonic approaches although the theory of public goods has progressed rapidly since paul samuelson s seminal article the empirical measurement of the value of demand for public goods only recently has received increased attention perhaps the best known and most widely accepted empirical approach has been the use of hedonic prices wherein for example it is assumed that either wages or housing values reflect spatial variation in public good characteristics of different communities this indirect approach based on theoretical work of charles tiebout kelvin lancaster sherwin rosen and others has proven quite successful among public goods or bads which have been valued using the hedonic approach are climate i hoch air pollution robert anderson and thomas crocker d harrison and d rubinfeld social infrastructure r cummings et al and other community characteristics such as noise level j nelson and ethnic composition ann schnare an alternative approach is to directly ask households or individuals to state their willingness to pay for public goods using survey techniques despite arguments that strategic bias will invalidate survey results there exists the need for an alternative to the hedonic approach as an example consider the case of a remote and unique scenic vista valuable to recreators which is threatened by air pollution from a proposed coal fired plant a typical situation in the western united states although it is possible in principle to impute the value of clean air and visibility from the relative decline in local visitation which might follow construction of a power plant information on the value of visibility at the site is needed prior to construction for socially optimal decision making on plant location and pollution control equipment the hedonic approach is unavailable both because the scarcity of local population as opposed to recreators makes use of wage or property value data impossible and because scenic vistas may themselves be unique for these reasons a randall et al first applied survey methods for valuing visibility and other environmental effects of large coal fired power plants in the four corners region of new mexico since this initial application the survey approach has been widely used to value environmental commodities where market data for hedonic analysis is difficult to acquire see for example brookshire ives and schulze rowe et al brookshire et al other early attempts to value public goods using the survey approach include r davis peter bohm and j hammack and g brown although results of using the survey approach for estimating the value of public goods appear to be internally consistent replicable and consistent with demand theory see schulze et al little work on external validation has been reported thus the purpose of this paper is to report on an experiment designed to validate the survey approach by direct comparison to a hedonic property value study the los angeles metropolitan area was chosen for the experiment because of the well defined air pollution problem and be assistant professor university of wyoming assistant professor university of missouri rolla associate professor university of wyoming and professor university of wyoming respectively the research reported here was funded under a grant methods development for assessing air pollution control benefits from the u s environmental protection agency we would like to give special thanks to alan carlin and shelby gerking for their helpful suggestions and contributions additional helpful comments were received from a myrick freeman iii john tschirhart and james murdoch all conclusions are of course our sole responsibility

valuing environmental damage the purpose of this paper is to review the most important parts of the economic theory and measurement of environmental damage the paper is structured as follows section 2 introduces the willingness to pay concept and money measures such as the compensating variation and the equivalent variation this section also offers an interpretation of money measures in terms of the outcome of a referendum section 3 defines the total value of an environmental asset in order to give the reader an idea of the complexity of the money measures used in recent empirical studies section 4 and 5 introduce risk or uncertainty and discuss the choice of money measure in a risky world in section 6 three frequently employed methods for the estimation of money measures are introduced the paper ends with some remarks regarding the limitations of these approaches to decision making copyright 1990 by oxford university press

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

the impact of climate change on the balanced growth equivalent an application of fund the stern review added balanced growth equivalents bge to the economic climate change research agenda we first propose rigorous definitions of the bge for multiple regions and under uncertainty we show that the change in the bge is independent of the assumed scenario of per capita income for comparable welfare economic assumptions as the stern review we calculate lower changes in bge between a business as usual scenario and one without climate impacts with the model fund than the stern review found with the model page we find that mitigation policies give even lower changes in bge and argue that those policy choices should be the focus of the research effort rather than total damage estimates according to our results the current carbon tax should be below 55 tc sensitivity analyses show that the stern review chose parameters that imply high impact estimates however for regionally disaggregated welfare functions we find changes in bge that are significantly higher than the results from the stern review both for total damage as for policy analysis with regional disaggregation and high risk aversion we observe fat tails and with that very high welfare losses

willingness to pay and compensation demanded experimental evidence of an unexpected disparity in measures of value aside from possible income effects measures of the maximum amounts people will pay to avoid a loss and the minimum compensation necessary for them to accept it are generally assumed to be equivalent unexpectedly wide variations between these sums however have been noted in survey responses to hypothetical options this paper reports the results of a series of experiments that confronted people with actual money payments and cash compensations the results indicate that the compensation measure of value seems to exceed significantly the willingness to pay measure which would appear to call into some question various rules of entitlement damage assessments and interpretations of indifference curves

are there environmental limits to cost benefit analysis this paper considers the problem areas found in applying cost benefit analysis cba to projects involving environmental costs or benefits this is particularly relevant given recent moves by the uk government to include environmental valuations in cba exercises and in other related appraisal activities following the publication of the pearce report the paper argues that a major problem lies in placing monetary values on non market goods the paper also addresses the problems of i differences between citizen and consumer values ii complexity of ecosystems iii irreversibility and uniqueness and iv intergenerational equity and discounting the extent to which cba is an institution open to capture is also discussed

measuring the existence value of wildlife what do cvm estimates really show two research programs are brought together to contribute to the growing body of work on alternatives to standard welfare based approaches to environmental valuation and policy the first is the theoretical literature undermining the new welfare

payoff dominance vs cognitive transparency in decision making i introduction there is a general question about how well laboratory markets work in eliciting true preferences given the low opportunity costs of making errors as in harrison 1989 vernon smith 1982 set out a series of conditions that must be adhered to if a laboratory market investigation is to provide insight into economic behavior in naturally occurring markets the opportunity cost question posed above is covered under smith s payoff dominance and reward saliency precepts for laboratory market experiments if the experimental setting is to elicit true preferences from the subjects the monetary payoffs in the experiment must be salient and dominate potential extraneous influences on subject behavior this paper reports on three series of experiments which employ the becker degroot marshak bdm mechanism to investigate the interaction between payoff dominance reward saliency and cognitive effort in the decision task the bdm mechanism is well suited to this task because it involves only individual choice is theoretically incentive compatible and offers a high degree of experimenter control over payoffs initial information and feedback on the results of decisions becker degroot and marschak 1964 introduced the following preference elicitation mechanism individuals state the most they would be willing to pay wtp 1 for a good then a random price is drawn from a distribution known to the individuals if the stated value is greater than or equal to the random price the individual buys the good at the randomly determined price otherwise the individual does not buy the good the bdm bidding mechanism can be shown to be incentive compatible the intuition is straightforward it is not in the individual s interest to understate true wtp if the random buying price falls between the stated wtp and the true wtp the individual has foregone a beneficial trade it is also not in an individual s interest to overstate true wtp if the random buying price is greater than the true value but less than the stated value the individual will be required to buy the good at a price greater than true wtp a more formal proof is easy to construct 2 let v the true value of one unit of the auction good b the bid submitted to purchase one unit of the good r the price randomly determined to be paid if the good is purchased p r probability that price r is randomly selected y sup o initial income u y utility a function of money income and the value of the good and e initial monetary balance provided in an experiment in the wtp version of the bdm auction the good is purchased if b greater than or equal to r with the subject paying only r and not purchased if b less than r in experiments using the bdm the subject cannot bid more than the experimental balance e so it must be that v less than e if the experiment is to be demand revealing assuming that subjects maximize expected utility they will submit bid b that maximizes eu integral of p r u y sup o e v r dr between limits b and 0 integral of p r u y sup o e dr between limits e and b the first integral describes the expected payoff for random prices r below the bid b and the second integral describes the expected payoff for random prices between the bid b and the maximum possible bid as limited by the balance e the maximum over b occurs when the derivative of eu with respect to b is zero in other words when deu db p b u y e v b u y e 0 so long as p b greater than 0 i e there is some probability the offered bid will be the price the above implies that the maximum occurs when b v in other words it is individually optimal to submit a bid b equal to one s true value v for the commodity although the bdm is incentive compatible in theory it is an empirical question whether it has this property in practice