The Empirics of Wetland Valuation: A Comprehensive Summary and a Meta-Analysis of the Literature

Wetlands are highly productive ecosystems, providing a number of goods and services that are of value to people. The open-access nature and the public-good characteristics of wetlands often result in these regions being undervalued in decisions relating to their use and conservation. There is now a substantial literature on wetland valuation, including two meta-analyses that examine subsets of the available wetland valuation literature. We collected over 190 wetland valuation studies, providing 215 value observations, in order to present a more comprehensive meta-analysis of the valuation literature that includes tropical wetlands (e.g., mangroves), estimates from diverse valuation methodologies, and a broader range of wetland services (e.g., biodiversity value). We also aim for a more comprehensive geographical coverage. We find that socio-economic variables, such as income and population density, that are often omitted from such analyses are important in explaining wetland value. We also assess the prospects for using this analysis for out-of-sample value transfer, and find average transfer errors of 74%, with just under one-fifth of the transfers showing errors of 10% or less. † This paper has not been submitted elsewhere in identical or similar form, nor will it be during the first three months after its submission to the Publisher.     

Elicitation of Expert Opinion in Benefit Transfer of Environmental Goods

Benefit transfer is a method for estimating the value of environmental goods that involves the use of past information on identical or similar goods. This paper considers the extent to which benefit transfer can be based on prior distributions elicited from expert opinion. We propose two alternative methods to elicit the parameters of a prior distribution from experts on environmental valuation. An experiment is carried out on the value of National Parks in Spain. The results from the elicited distributions are compared with the information provided by onsite samples of visitors. The results indicate that individual experts made different predictions about the potential value of the policy areas that were diverse and unable to accurately predict the value for each policy site. However, the average across the elicited distributions approaches the estimated distribution with empirical data and accurately predicts the relative values for the two policy sites considered.     

Exploring Benefit Transfer: Disamenities of Waste Transfer Stations

The benefit transfer method was developed as an alternative way to value externalities using values from studies of similar circumstances, carried out at similar sites somewhere else, given the challenges and high costs inherent in assessing the actual cost. Specifically, in order to test the performance of the benefit transfer method, employing hedonic price models, this study focused on estimates of disamenities associated with waste transfer stations at four different cities in Israel. The sites were intentionally selected to represent a variety of circumstances. We transferred the estimated benefit function from a “study site” to a “policy site”. The goodness of fit was examined by comparing the calculated value, with actual data from the policy site. To test the sensitivity of the benefit transfer function to socioeconomic and housing characteristics, it was repeatedly applied to different sets of observations. The findings suggest that a relatively large number of alternative benefit functions are transferable. Statistical inequality outcome regarding the degree of similarity between samples does not unequivocally rule out the appropriateness of transferring environmental values across studies. Transfer errors varied between −21% and +29%, and the absolute average error for all transfers was 15.4%. Errors were lower for transfer between relatively similar cities in terms of size and location and between sub-samples that were similar in socioeconomic characteristics and housing type. However, when a site with very dissimilar data was involved, the average absolute error rose to 19%.     

National and International Benefit Transfer Testing with a Rigorous Test Procedure

Benefit transfer, as a mean to transfer values from existing monetary valuation studies to new policy sites, has been in use for many years. This paper aims to analyze the forecasting quality of benefit transfer by applying a rigoroust-test – also referred to as Accuracy-t-test – that takes into account testing errors which were made in previous surveys. Beside the analysis of national benefit transfers based on two German contingent valuation studies additional efforts were made to investigate into the validity and accuracy of international benefit transfer by considering two Norwegian studies that employed a similar survey design.     

Using structural restrictions to achieve theoretical consistency in benefit transfers

Analysts often extrapolate estimates of the value of environmental improvements reported in prior studies to evaluate new policy proposals, a practice sometimes referred to as “benefit transfer.” Benefit transfer functions are frequently specified based on statistical considerations alone. However, such a purely statistical approach can lead to willingness-to-pay functions that fail to satisfy some aspects of theoretical consistency that may be especially important for policy evaluations. In this paper, we examine several previous meta-analyses of nonmarket valuation studies in light of the adding-up condition, which is one important aspect of theoretical validity. We then use meta-regression to estimate a new willingness-to-pay function for surface water quality improvements intended to be used for benefit transfers. We estimate the meta-regression model using summary results from 51 previously published stated preference studies. An important feature of our approach is that we develop the meta-regression estimating equation to ensure that the resulting benefit transfer function will necessarily comply with the adding-up condition. This is achieved by first specifying a marginal willingness-to-pay function and then deriving an expression for total willingness-to-pay. This leads to a non-linear estimating equation, so we estimate the parameters of the model using non-linear least squares. We discuss the advantages and disadvantages of our approach relative to other structural approaches, and we compare our empirical results to a more traditional nonstructural meta-regression model. Finally, we examine the quantitative importance of imposing the adding-up condition in our case study by performing some illustrative calculations of willingness-to-pay for hypothetical water quality improvements using both structural and non-structural models.     

The impact of income distribution on structural transformation: The role of extensive margin

I study the impact of income distribution on structural transformation. Empirical results suggest that income inequality induces lower share of employment in services sector, and this negative effect gets stronger as income level rises. To explain these facts, I present a multi-sector model with non-homothetic preference and heterogenous agents in terms of different income levels. In equilibrium, the individuals will not consume all the goods available in the market. While the income elasticity falls as income increases at the individual level, it may not at the aggregate level. The extensive margin of consumers is important to understand this result. Within this framework, I show that income inequality may have negative effects on an industry with income elasticity larger than 1. More importantly, this effect is getting stronger as income levels increase.     

我国收入不平等、金融发展和消费需求波动的实证研究:1978～2001

本文考察了收入不平等与总消费需求变动之间的联系,在高收入地区,不平等程度越大似乎消费需求波动越大,而在低收入地区,收入不平等越大,消费需求波动反而较小。本文找到证据表明金融发展水平能有助于解释为什么收入分配在高收入和低收入地区中影响消费需求的短期波动是不同的,本文的政策含义是,加快低收入地区如中西部的经济和金融发展步伐,加大金融发展相机调整的力度。     

An Economic Analysis of Public Transfers

This paper develops simple models of public transfers. The sources of income inequality are differences in ability and in luck. The government employs a redistribution policy that arises from altruistic motives in the case of ability differences. I consider the case where the government re-optimizes income transfers after it observes the outcome of private activities. When the source of income inequality is differences in luck, the economy creates a mutual insurance or provides public goods out of risk-sharing motives. I derive the paradoxical result that a more able individual would not enjoy higher welfare than a less able individual. I also investigate how public transfers react to increases in income level and income inequality.
JEL Classification Numbers: F21, F35.     

中国收入差距的走势和影响因素分析

中国收入差距在过去20年中持续扩大,对经济的持续增长、社会公正与稳定都提出了挑战。本文通过计量模型检验库兹涅茨曲线在中国是否存在,证明收入差距还有继续上升的明显趋势,但其下降阶段不能确证。同时模型分析发现有一系列因素对收入差距的扩大或缩小有重要影响。这包括经济增长方面的因素、收入再分配和社会保障、公共产品和基础设施,以及制度方面的因素。这说明有可能通过合理的政策调整来控制收入差距的继续扩大。文章讨论了这些发现的政策含义。     

Effects of Technology Transfers on the Provision of Public Goods

In this paper, we examine the viability ofcooperative policies oriented to the resolution oftransboundary pollution problems using the theory ofprivate provision of public goods in a two-countrymodel. We analyze the effects on economic welfare ofvoluntary technological transfers oriented to reducingthe emission of pollutants.Our analysis shows that when the atmosphere istaken as a pure public goods, ``a strong paradox' emerges:the advanced country, in spite of the transfer, seesits economic welfare improved while the developingcountry sees it worsen. Moreover, if both a technicaland an income transfer occur, this paradox mightnot be solved. Furthermore, ``a paradoxicalimprovement' occurs when the advanced country does nottake any policy towards the environment but thedeveloping country does: an improvement in the levelof technology in the developing country allows for anexpansion of the level of utility in both countries.On the other hand, in the case where the atmosphere istaken as an impure public goods, when both countriespursue an abatement policy, the transfer of technologyleads to an improvement in welfare in bothcountries.     

Economic Value of Water Quality Improvement by One Grade Level in Erhai Lake: A Willingness-to-Pay Survey and a Benefit-Transfer Study

Water quality in China has seriously deteriorated in recent years. However, very few valuation studies have been conducted to estimate the monetary values associated with water quality changes. As a result, the decision makers can hardly make rational choices with regard to investments in water quality improvement. This paper presents a valuation study conducted in Dali, Yunnan Province, which aims to estimate the total economic value of improving the water quality of Erhai Lake by one grade level. Both the contingent valuation method and the benefit transfer approach are employed in this study. The contingent valuation estimation strategy reveals that, on average, a household located in Dali is willing to pay about 27 yuan per month continuously for 5 years for the water quality improvement, equivalent to 1.7% of the household monthly income. The elasticity of willingness-to-pay with respect to income is estimated to be 0.28. The internal rate of economic return of the proposed pollution control project is estimated to be 13%. The benefit transfer exercise produces a similar estimation on willingness to pay (WTP) values, with a difference of less than 2% compared with the contingent valuation approach. The results indicate the potential reliability of using the benefit transfer approach for valuation estimations in Chinese provinces.     

Household tax evasion

Household members share public goods and make intra-household transfers. We show how these features of the household interact with the tax evasion decision, and identify the dimensions in which household evasion differs from individual evasion. In the model we present two members of a household choose how much to contribute to a household public good and how much self-employment income to evade. We are interested in how different evasion possibilities interact with the contribution decisions to the household public good and the role of income transfers within the household. We show the household evasion decision differs from the individual decision because it affects the outcome of the household contribution game. When household members are taxed as individuals neutrality applies when choices are not constrained. If the evasion level of one household member is constrained then an income transfer can generate a Pareto improvement. When the household members are jointly taxed there is a couple constraint on strategies and corner solutions can emerge.     

Indexing Out of Poverty? Fiscal Drag and Benefit Erosion in Cross-National Perspective

We assess how tax-benefit policy developments in 2001–11 affected the household income distribution in seven EU countries. We use the standard microsimulation-based decomposition method, separating further the effect of structural policy changes and the uprating of monetary parameters, which allows us to measure the extent of fiscal drag and benefit erosion in practice. The results show that despite different fiscal effects, policies overall mostly reduced poverty and inequality and both types of policy developments had sizeable effects on the income distribution. We also find that the uprating of monetary parameters not only had a positive effect on household incomes, meaning fiscal drag and benefit erosion were avoided, but generally also contributed more to poverty and inequality reduction than structural policy reforms.     

The distributional impact of public services when needs differ

Despite a broad consensus on the need to take into account the value of public services in distributional analysis, there is little reliable evidence on how inclusion of such non-cash income actually affects poverty and inequality estimates. In particular, the equivalence scales applied to cash income are not necessarily appropriate when including non-cash income, because the receipt of public services is likely to be associated with particular needs. In this paper, we propose a theory-based framework designed to provide a coherent evaluation of the distributional impact of local public services. The valuation of public services, identification of target groups, allocation of expenditures to target groups, and adjustment for differences in needs are derived from a model of local government spending behaviour. Using Norwegian data from municipal accounts and administrative registers we find that the inclusion of non-cash income reduces income inequality by about 15% and poverty rates by almost one-third. However, adjusting for differences in needs for public services across population subgroups offsets about half the inequality reduction and some of the poverty decrease.     

On the paradoxical case of a consumer-based environmental subsidy policy

We apply an environmentally differentiated duopoly model to the analysis of environmental policy involving consumer subsidies based on the emission levels of the products consumers purchase. More specifically, we consider the environmental and welfare effects of subsidizing consumers who purchase environmentally friendly goods in the case of a partially covered market with a Cournot duopoly. We show that, paradoxically, the subsidy policy degrades the environment, and that the optimal policy depends on the degree of marginal social valuation of environmental damage. That is, if the marginal social valuation of environmental damage is larger than a certain value, a consumer-based environmental subsidy policy is not socially optimal.     

Making Benefit Transfers Work: Deriving and Testing Principles for Value Transfers for Similar and Dissimilar Sites Using a Case Study of the Non-Market Benefits of Water Quality Improvements Across Europe

We implement a controlled, multi-site experiment to develop and test guidance principles for benefits transfers. These argue that when transferring across relatively similar sites, simple mean value transfers are to be preferred but that when sites are relatively dissimilar then value function transfers will yield lower errors. The paper also provides guidance on the appropriate specification of transferable value functions arguing that these should be developed from theoretical rather than ad-hoc statistical approaches. These principles are tested via a common format valuation study of water quality improvements across five countries. While this provides an idealised tested, results support the above principles and suggest directions for future transfer studies.     

收入不平等、政策偏向与最优财政再分配政策

本文构建的理论模型探讨了收入不平等、政策偏向与最优财政再分配之间的关系。模型显示:政策偏向是收入不平等与财政再分配恶性循环的决定因素。当政策偏向于穷人时,最优财政再分配系统的选择是提高税率,扩大对穷人的转移支付;当政策偏向于富人时,最优财政再分配系统的选择是降低税率,减少对穷人的转移支付。依据中国数据的实证研究发现:(1)中国收入不平等不断恶化,针对恶化的不平等而采取的财政再分配政策效果差,没能扭转不平等恶化趋势,政策偏向严重。(2)税收再分配政策偏向富人,使富人税负相对轻于穷人,居民收入不平等加剧;偏向于穷人的转移支付多为消费券(物),导致越扶越贫。为此,需要从调整所得税和转移支付政策等方面采取相关对策。     

村庄选举和收入分配--来自8省48村的证据

运用1986—2002年间8省48村和家庭的调查数据,本文研究了村庄选举的引进如何影响村一级的收入分配,发现引进选举制度使村级基尼系数降低6·4%—8%。我们也分析了选举的时间效应,发现首届选举后的第3—6年间,选举降低收入分配差距的效果最显著。这些结论对正确地认识和完善村庄选举具有重要的参考意义。     

Adjusting for Cultural Differences in International Benefit Transfer

Values for non-market goods can be expected to be sensitive to variations in the cultural contexts of beneficiaries. However, little progress has been made to date in adapting benefit transfer (BT) procedures for cultural variations. Using information from a study that ranked 62 societies with respect to nine attributes of their cultures, we develop an index that is then used to re-weight multiple coastal ecosystem service value estimates. We examine whether these culturally-adjusted BT estimates are statistically different than simply transferring the income-adjusted mean transfer estimates for each coastal ecosystem service from international study sites to the policy site. We find that once differences in income levels have been accounted for, the differences in cultural dimensions between study and policy sites actually have little impact on the magnitude of our transfer estimates. This is not a surprising result given that the majority of the study site estimates are derived from countries that share many ethnic, linguistic and other cultural similarities to the policy site. However, benefit adjustments based on cultural factors could have a much higher impacts in settings different to that investigated here.     

The Role of Banks in Shaping Income Inequality: A Within-Country Study

This paper investigates the role of banks in shaping income inequality. We extend the current literature on the banking–inequality nexus by examining a sample of 103 Italian provinces for the period 2000–2018. We find that a higher banking development decreases income inequality. From a methodological viewpoint, we aim to contribute to the current literature by both adjusting the index of income inequality for the presence of tax evasion in income data and applying different estimation approaches to control for endogeneity. Some policy implications emerge from the findings of this study.