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The standard test for scope sensitivity in contingent valuation studies determines whether the response to changes in scope is statistically significant; it does not address whether the magnitude of response is appropriate given the specified changes in scope. We examine contingent valuation studies that implemented scope tests to determine what they imply about the adequacy of response to scope. We find that in the vast majority of studies, the magnitude of response cannot be assessed. Only three studies permit such an assessment: Samples and Hollyer (1990), Diamond et al. (1993) and Chapman et al. (2009). The first two papers find that responses to their surveys did not vary adequately with scope. The third study passed the standard scope test, but we show that the magnitude of response in this study is inadequate by straightforward methods of assessment and cannot be explained by diminishing marginal utility or substitution. More research is needed on this issue, including wider application of adding-up tests on incremental parts, as well as the development of other methods that permit an assessment of the magnitude of response or other tests of rationality. [Copyright &y& Elsevier]

: Internet is an increasingly popular data collection mode for stated preference research in environmental economics. However, little is known about how this survey mode may influence data quality and welfare estimates. As part of a national contingent valuation (CV) survey estimating willingness to pay (WTP) for biodiversity protection plans, we assign two groups of respondents either to an Internet or face-to-face (in-home) interview mode. Our design aims to better isolate measurement effects from sample composition effects by drawing both samples from the same sample frame. We find little evidence of social desirability bias in the interview setting or satisficing (shortcutting the response process) in the Internet survey. The share of “don''t knows”, zeros and protest responses to the WTP question with a payment card is very similar between modes and equality of mean WTP cannot be rejected. Results are fairly encouraging for the use of Internet in CV as stated preferences do not seem to be significantly different or biased compared to face-to-face interviews. [Copyright &y& Elsevier]

A survey was designed to elicit donations for delaying inevitable aquatic invasions of inland water bodies within a respondent's region. Surveys were distributed throughout the United States. Assuming all aquatic species groups invade simultaneously, our results suggest that the average person was willing to make a one-time payment of $48 to delay low to high impacts one year (aggregates to nearly $4billion for all U.S. households). By comparison, the federal government currently (2006) invests $394million annually for all invasive species (aquatic and terrestrial) prevention and early detection/rapid response. [Copyright &y& Elsevier]

The contingent valuation method is a widely used, yet controversial approach for valuating unpriced public goods in environmental and ecological economics. There is ongoing debate about the validity of the willingness-to-pay statements this method elicits particularly then when ethically or morally 'charged' public goods are assessed. It has been assumed that a considerable portion of the public holds deontological stances toward and applies analytical moral reasoning to such goods, which distort willingness-to-pay statements and subsequent cost-benefit analyses based on stated economic values. Results from studies in developmental and moral psychology, however, indicate that the majority of people base moral choice, and subsequently trade-offs, on social norms, affective reactions, and moral intuition rather than on analytical moral reasoning. This article presents a small focus-group study of people in the UK (n =18), exploring whether their responses supports the idea that a considerable percentage of the public holds deontological stances towards the environment that influence their willingness to pay for environmental goods. The article contributes to the discourse on the validity of willingness-to-pay statements. From a broader perspective, it scrutinizes the importance of analytical moral reasoning and suggests that affective judgments and intuition are relevant to environmental valuation. [Copyright &y& Elsevier]

Abstract: This paper explores and contrasts the different social processes of valuation now appearing as economic means of valuing the environment. Monetary valuation via stated preference approaches has been criticised for assuming well formed and informed preferences and excluding a range of sustainability concerns such as rights, fairness and equity. Deliberative monetary valuation (DMV) in small groups is a novel hybrid of economic and political approaches which raises the prospect of a transformative and moralising experience. Critics of standard contingent valuation approaches have advocated this as offering a way forward. However there has been a lack of clarity as to the means of obtaining values, the expected outcomes and their role. Moving to group settings of deliberation raises concepts of social willingness to pay and accept which are distinct from an aggregate of individual value, although this does not seem to have been widely recognised. A new classification of values is presented appropriate to the literature trying to merge economic and political processes. Values associated with the individual may be exchange values, charitable contributions or fair prices, while social values can be speculative, expressive or arbitrated. The use of DMV is shown to result in different values due to variations in the institutional setting and process of valuation. [Copyright &y& Elsevier]

Abstract: The standard metaphor of market failure is an impediment to the crafting of environmental policy that can escape policy lock in. Sustainability requires a policy process that can avoid this lock in. Sustainability concerns the creation of dynamic human processes that can respond to—indeed anticipate—unanticipated feedback from biological processes. [Copyright &y& Elsevier]

Abstract: This research examines the impact of uncertainty on contingent valuation responses using (1) a survey of Canadian landowners about willingness to accept compensation for converting cropland to forestry and (2) a survey of Swedish residents about willingness to pay for forest conservation. Five approaches from the literature for incorporating respondent uncertainty are used and compared to the traditional random utility model with assumed certainty. The results indicate that incorporating uncertainty has the potential to increase fit, but could introduce additional variance. While some methods for uncertainty can be an improvement over traditional approaches, it is imperative to exercise caution when making systematic judgments about the effect of uncertainty on contingent valuation responses. [Copyright &y& Elsevier]

Abstract: This paper examines empirically the relative influence of the degree of endangerment of wildlife species and their stated likeability on individuals'' allocation of funds for their conservation. To do this, it utilises data obtained from the IUCN Red List, and likeability and fund allocation data obtained from two serial surveys of a sample of the Australian public who were requested to assess 24 Australian wildlife species from three animal classes: mammals, birds and reptiles. Between the first and second survey, respondents were provided with extra information about the focal species. This information resulted in the dominance of endangerment as the major influence on the allocation of funding of respondents for the conservation of the focal wildlife species. Our results throw doubts on the proposition in the literature that the likeability of species is the dominant influence on willingness to pay for conservation of wildlife species. Furthermore, because the public''s allocation of fund for conserving wildlife species seems to be more sensitive to information about the conservation status of species than to factors influencing their likeability, greater attention to providing accurate information about the former than the latter seems justified. [Copyright &y& Elsevier]

Abstract: It is commonly assumed that respondents'' lack of familiarity with the valued resource causes invalid and unreliable responses in contingent valuation surveys. With non-users'' valuations, mainly motivated by non-use values, the issue is also closely linked to the discussion of the measurement of non-use values. This paper re-examines the impact of previous use on respondents'' willingness to support nature conservation, their motives for valuing the resource and the validity of responses. The users'' and non-users'' characteristics differed, but there was no difference between the groups in their willingness to support sustained conservation. However, those planning to visit the area in the near future were more likely to pay for conservation than other respondents, even if they did not have previous use experience. Users considered their income constraint somewhat more carefully and were more aware of conservation-related issues than non-users. However, there was no difference in the validity of the WTP responses of the groups. Thus, there seems to be no rationale from a point of view of validity to restrict CVM analysis only to those individuals who have previous experience of the resource, which is in line with the basic premise of CVM. Furthermore, non-use values remained as significant motives for valuing the resource even if the use of the resource was intensive. Therefore, if the existence of a large non-use value component is considered as problematic in general, the problem is likely to exist for all respondent groups and not only for non-users. [Copyright &y& Elsevier]

Abstract: This paper examines the viability of an alternative (to willingness-to-pay) method of eliciting values for farm animal welfare improvements. The matching method, common in the health and safety literature, appears to perform well, generating results that, as might be expected, are driven both by scheme-specific variables and individual respondent characteristics. However, the results do not converge well with equivalent willingness-to-pay based values from the same population. One interpretation of this result is that benefit–cost ratios from stated preference studies are arbitrary phenomena with obvious implications for any policymaking based on such findings. [Copyright &y& Elsevier]

Abstract: The debate on the relevance of monetary valuation of environmental goods has often hinged around the convergence of stated and revealed preferences, and in turn the actual money choices of respondents. In this paper, we report two separate experiments conducted in southeastern Nigeria to compare irrigators'' stated willingness to pay for a river basin restoration scheme designed to mitigate soil and water pollution problems in their farms with their actual expenditures to mitigate the same pollution problems. We found that the farmers'' stated and revealed preferences were significantly correlated but yielded significantly different means at 5% level. While econometric analysis reveals a systematic association between key socioeconomic variables and farmers'' stated WTP, lending credence to the CVM within its theoretical framework, analysis of the qualitative follow-ups reveals inconsistencies in some farmers'' stated and revealed preferences that cannot be satisfactorily explained on the basis of economic theory alone. While individual utility maximisation was a dominant driver of both stated and revealed preferences for most farmers, lack of environmental awareness, information complexity, risk aversion and peer pressure were seen to limit the ability and willingness of the least educated segment of the sample to make apparently rational economic decisions in both markets. Overall, the results question the use of convergent and/or theoretical validity arguments for justifying and/or criticising the use of stated preference experiments in environmental policy. [Copyright &y& Elsevier]

Abstract: Policy makers have responded to concerns over declining levels of biodiversity by introducing a range of policy measures including agri-environment and wildlife management schemes. Costs for such measures are relatively easy to establish, but benefits are less easily estimated. Economics can help guide the design of biodiversity policy by eliciting public preferences on different attributes of biodiversity. However, this is complicated by the generally low level of awareness and understanding of what biodiversity means on the part of the general public. In this paper we report research that applied the choice experiment and contingent valuation methods to value the diversity of biological diversity. Focus groups were used to identify ecological concepts of biodiversity that were important and relevant to the public, and to discover how best to describe these concepts in a meaningful and understandable manner. A choice experiment examined a range of biodiversity attributes including familiarity of species, species rarity, habitat, and ecosystem processes, while a contingent valuation study examined public willingness to pay for biodiversity enhancements associated with agri-environmental and habitat re-creation policy. The key conclusions drawn from the valuation studies were that the public has positive valuation preferences for most, but not all, aspects of biodiversity, but that they appeared to be largely indifferent to how biodiversity protection was achieved. Finally, we also investigate the extent to which valuation workshop approaches to data collection can overcome some of the possible information problems associated with the valuation of complex goods. The key conclusion was that the additional opportunities for information exchange and group discussion in the workshops helped to reduce the variability of value estimates. [Copyright &y& Elsevier]

Abstract: In an original extension of contingent valuation methodology (CVM), support for a proposed environmental regulation is examined under three alternative polluter-pay specifications. Using a statewide random telephone sample of Washington State''s electorate, one scenario asks respondents for their support absent any CV price and absent any information regarding what producers will pay. A second scenario asks willingness to pay (WTP) providing only a CV price but no polluter-pay information. A third scenario asks respondents for their support giving both a CV price and a percentage of total costs producers will pay. Extending the CV methodology, this percentage varies randomly between respondents. Absent any price or firm cost sharing information, some respondents assume producers are absorbing the costs. Providing a CV price reverses this assumption, and reduces support even after controlling for price. When the CV price is given along with the percentage, WTP increases the larger the percentage. Within each scenario support also varies according to whether the type of industry being regulated is small and competitive, or monopolistic. [Copyright &y& Elsevier]

Abstract: This paper is about how institutions determine choices and the importance of this for environmental policy. The model of individual rational choice from neoclassical economics is compared with the model of socially determined behavior. While in the first case, institutions are either exempted from or understood as mere economizing constraints on behavior, the latter perspective views institutions as basic structures necessary also to enable people to act. The paper develops a way to integrate the individualistic model into the wider perspective of social constructivism by viewing it as a special form of such construction. On the basis of this synthesis three issues with relevance for environmental economics are discussed. First, the role of institutional factors in the process of preference formation is emphasized. Next, the role of institutions for the choice of desired states of the environment is analyzed. Finally, the effect of various policy instruments to motivate people to produce these states is discussed. It is concluded that the core policy issue is to determine which institutional frameworks are most reasonable to apply to which kind of problem. Issues, which from the perspective of neoclassical economics are pure technical, become serious value questions if understood from an institutional perspective. [Copyright &y& Elsevier]

Abstract: Instead of assuming that each individual has a single point value for a good or service in her mind, we believe that an individual''s valuation of an environmental quality improvement is best viewed as a random variable with an associated distribution. To measure individuals'' valuation distributions, we propose a contingent valuation elicitation procedure based on a stochastic payment card approach that presents each respondent with numerical likelihood that the respondent would agree to pay a specified amount in order to implement an environmental improvement plan. An empirical pilot study was conducted in Sofia, Bulgaria to illustrate the implementation of this stochastic payment card and to contrast it with the traditional referendum elicitation procedure. In this pilot study the results obtained using the stochastic payment card approach are significantly lower than those obtained from the referendum model. [Copyright &y& Elsevier]

A study was undertaken to estimate the benefits and costs of riparian restoration projects along the Little Tennessee River in western North Carolina. Restoration benefits were described in terms of five indicators of ecosystem services: abundance of game fish, water clarity, wildlife habitat, allowable water uses, and ecosystem naturalness. A sequence of dichotomous choice contingent valuation questions were presented to local residents to assess household willingness to pay increased county sales taxes for differing amounts of riparian restoration. Results showed that the benefits of ecosystem restoration were a non-linear function of restoration scale and the benefits of full restoration were super-additive. We estimated the costs of riparian restoration activities by collecting and analyzing data from 35 projects in the study area. After adjusting our estimated valuation function for socio-economic characteristics of the local population, the benefit/cost ratio for riparian restoration ranged from 4.03 (for 2 miles of restoration) to 15.65 (for 6 miles of restoration). Riparian restoration in this watershed is therefore an economically feasible investment of public funds at all measured spatial scales. [Copyright &y& Elsevier]