david pearce and the economic valuation of biodiversity david pearce was a pioneer in the economic valuation of biodiversity his work powerfully influenced both later economists who worked in the field and natural scientists and practitioners who gained and appreciation of the importance of economics to their efforts pearce often applied the paradigm of demonstration followed by appropriation the values of biodiversity must first be demonstrated to those who make decisions concerning its survival and then appropriated by them the later step will be possible when market and policy failures are rectified so as to allow the realization of conservation values while pearce wrote extensively on these themes he was also acutely aware of the limitations of the paradigm rosy projections of values that could not be realized and appropriated would be of little practical use and pearce often cautioned against excesses of optimism yet he also clearly believed that there are compelling if not always easily demonstrated reasons for conservation i argue in this paper that pearce s seminal work on the valuation of biodiversity cannot be understood without some appreciation of his philosophical perspective pearce would have described himself as a pragmatist however his pragmatism was grounded in the belief that it is both expedient and ethical to recognize that communities in some of the poorest corners of the world will only conserve biodiversity if they are justly compensated for the sacrifices they must make to do so

remittances from international migration a comparison of el salvador and nicaragua i use household data from el salvador and nicaragua to examine the determinants of remittances from international migration nearly twice as many households in san salvador the capital of el salvador receive remittances from relatives abroad than do households in managua the capital of nicaragua and of those who receive remittances the average remittances received in san salvador is over double that in managua 119 month to 45 month the difference is explained by differences in the behavioral coefficients and by differences in the self selection bias of those who remit out of the pool of emigrants between the two countries excerpt

joint confidence intervals for income shares and lorenz curves in a recent paper beach and davidson 1983 extended the principles of statistical inference to lorenz curves and income shares by establishing the asymptotic distribution and covariance structure of a vector of lorenz curve ordinates corresponding to a set of quantile abscissae one can thus use the lorenz curve and income shares no longer just as descriptive devices for summarizing distribution information but now also as analytical tools for comparing alternative distributions and carrying out conventional statistical inference on them it would clearly be desirable however to extend and complement this work by providing a method for computing a set of joint confidence intervals about these income shares and for illustrating graphically a joint confidence band about a set of estimated lorenz curve ordinates the present paper provides a new and simple technique for doing this when analyzing differences between sets of income shares or lorenz curves one typically wants to elicit more detailed information than is provided by a standard joint chi square test on the overall set of shares that is when the hypothesis of two sets of shares being the same is rejected we generally want to know further which particular differences in shares are different from zero and of these nonzero differences which are positive and which negative savin 1980 a natural way of providing such information is through multiple comparison procedures developed in this paper in a recent work richmond 1982 has developed a general method of finding multiple comparison intervals that is particularly suited to the present problem and in this situation appears to dominate other conventional alternatives in contrast for example to scheff s s projection method richmond s approach focuses on a set of primary points of interest income shares among a more general set of points including the lorenz curve ordinates and optimizes the joint confidence interval lengths on this primary set of points since estimated lorenz curve ordinates are built up from underlying income shares these shares perhaps further supplemented are natural choices for the primary set the method however also provides a joint confidence band that geometrically bounds the set of lorenz curve ordinates and interpolated segments between them the present

progress along the path evolving issues in the measurement of genuine saving more than 10 years since a practical linkage between sustainable development and a measure of national wealth expanded to include natural and environmental resources was first posited the empirical estimation of adjusted net savings dubbed genuine saving has evolved considerably in this paper we take stock of both progress achieved and the challenges that remain we begin by recalling the key points made in pearce and atkinson 1993 ecol econ 8 103 which presented the first cross country estimates of savings rates adjusted to reflect depletion and degradation of the environment we then briefly summarise the evolution of the theoretical argument linking savings and sustainability however the main focus of this paper is an aspect that concerned david pearce greatly namely the evolution of the measurement of genuine savings we identify and consider the empirical evidence with regard to two particular measurement issues the valuation of exhaustible resources and environmental degradation common to the both issues are concerns about measuring changes in national wealth in real world economies

international comparisons of welfare and poverty dominance orderings for ten countries inference based stochastic dominance procedures are applied to luxembourg income study data to rank ten western countries in terms of standards of living and poverty first order dominance comparisons ranks more than 50 percent of all pairwise comparisons and second order generalized lorenz dominance adds another 25 percent truncated dominance analysis is used to make inferences about poverty and up to 98 percent of the truncated distributions are ordered the results differ substantially from those obtained when only relative incomes and inequality are considered

down and out in north america recent trends in poverty rates in the united states and canada this paper examines why canadian poverty rates fell relative to u s poverty rates during the periods 1970 1979 and 1979 1986 during the 1970s the principal reason for declining canadian poverty rates is higher economic growth during the 1980s however differences in government transfer policy are the main cause of relative poverty change in the two countries virtually all of the 3 3 point fall in relative canadian u s poverty rates from 1979 to 1986 can be attributed to expansions in the canadian transfer system and simultaneous contractions in u s transfers

dynamic sustainability assessment the case of russia in the period of transition 1985 2008 abstract russia has experienced twenty years of economic and social change which had a substantial impact on the regional and sectoral patterns of the development of its economy infrastructure the quality of the environment and the well being of its people the current economic revival offers new opportunities and presents new challenges for the sustainable development of russia the paper employs the un sustainable development framework of indicators and assesses sustainability of russia using multi criteria evaluation methods namely the uncertainty randomization multi criteria evaluation method analysis and synthesis of parameters under information deficiency aspid the analysis covers economic environmental and social trends in russia s development in 1985 2008 and assesses sustainability of this development from the point of view of multiple criteria the results show the potential of employment of multi criteria methods for the sustainability assessment at the macro level and offer useful insights into multidimensional nature of sustainability and the role of priority setting in the evaluation process such an analysis reveals the degree of harmoniousness of sustainable development policy it shows how different sets of priorities determine the outcome of multidimensional analysis of sustainability and could potentially help in assessing progress and designing new policy instruments this paper is one of the first to apply multi criteria methods to the macro sustainability analysis in the dynamic setting

beyond implicit prices recovering theoretically consistent and transferable values for noise avoidance from a hedonic property price model using a two stage hedonic pricing methodology we estimate a system of structural demand equations for different sources of transport related noise in the first stage we identify market segments using model based clustering techniques and estimate separate hedonic price functions hpfs for each segment in so doing we show how a semiparametric spatial smoothing estimator outperforms other standard specifications of the hpf in the second stage we control for non linearity of the budget constraint and identify demand relationships using techniques that account for problems of endogeneity and censoring of the dependent variable our estimated demand functions provide welfare estimates for peace and quiet that we believe to be the first derived from property market data in a theoretically consistent manner

savings remittances and return migration abstract using a vast west german data set the paper shows that savings and remittances of migrants can be well explained by remigration plans and economic as well as demographic variables however the planned future duration of residence in germany has a negative and significant effect only on remittances

a theory of remittances as an implicit family loan arrangement abstract the idea of an implicit and informal loan agreement between family members to explain migrants remittances is not new but its implications have not been fully explored in the theoretical literature many empirically testable propositions may be derived from this hypothesis when trying to explain why emigrants remit what the time profile of remittances is how it depends on the intent to stay on the expected length of stay and on interest rates what use people make of remittances and how the home family consumption behavior is affected by the economic prospects in the receiving country furthermore this theory yields many interesting policy prescriptions for less developed countries wishing to maximize the remittance flow from emigrants

how substitutable is natural capital one of the recurring themes in the sustainability literature has been the extent to which a loss of natural capital can be made up for in welfare terms by an increase in other forms of capital this issue was raised early on in the debate on sustainability by pearce and has never really been resolved this paper is an empirical attempt to measure the degree of substitutability between different forms of capital a nested ces production function is used to allow flexibility in the estimated elasticities of substitution also within this specification natural resources and other inputs are combined in different levels of the function thus allowing for different levels of substitutability institutional and economic indicators are also incorporated in the production function estimated results show that the elasticities derived from functions involving land resources were generally around one or greater implying a fairly high degree of substitutability furthermore changes in trade openness and private sector investment have a statistically significant and direct relationship on the efficiency of production and hence on income generation no statistically significant relationship between income and any of the institutional indicators was found

air pollution and green accounts a simple model treating air emissions as cumulative pollutants is used to derive measures of green net national product the model implies that pollution emissions are properly valued at their marginal social costs in the measurement of green nnp the level of genuine savings net savings less the value of resource depletion and pollution emissions is shown to provide a useful indicator of sustainable development recent figures on the social costs of fuel cycles are used to derive genuine savings measures for the uk and other european nations several countries had negative genuine savings during the 1980s

re evaluating differences in poverty among central city suburban and nonmetropolitan areas of the us poverty in the united states varies greatly by location the difference in poverty intensity among locations however has only been evaluated by the official poverty measure the headcount ratio which has several drawbacks the official poverty statistics also suffer from use of a single arbitrary poverty line this paper uses a recently developed distribution sensitive measure of poverty and 1990 census data to reconsider the difference among central city suburban and nonmetropolitan poverty levels as well as differences among us regions instead of using a single arguable poverty line this paper lets the poverty line vary over an income range so that conclusions are more robust we check for significance of differences across locations by applying some recently developed methods of statistical inference

are international remittances altruism or insurance evidence from guyana using multiple migrant households abstract while international remittances provide significant disposable income for many households in less developed countries there is no consensus on migrants remittance motivation two principal competing explanations for remittances are altruism and risk sharing this paper employs previously unanalyzed data to bring new evidence to the debate we develop a simple theoretical model that yields distinct testable predictions for each motivation among the model s testable predictions is differential remittance behavior by migrants from households with multiple versus single migrants under altruism and risk sharing our estimation finds significant differences in remittance behavior of multiple and single migrants and these differences support the altruistic incentive to remit

international comparisons of poverty intensity index decomposition and bootstrap inference this paper proposes an alternative formulation for the sen shorrocks thon sst index of poverty intensity that is appropriate for survey data with sampling weights it also decomposes the sst index into the poverty rate the average poverty gap ratio among the poor and the overall gini index of poverty gap ratios to account for sampling variation in estimates of poverty intensity this paper uses the bootstrap method to compute confidence intervals and presents international comparisons using luxembourg income study lis data from the 1970s to the 1990s cross sectional and longitudinal analyses indicate that the percentage change in poverty intensity can be approximated by the sum of percentage changes in the poverty rate and average poverty gap ratio since changes in the overall gini index of poverty gap ratios are negligible in the early 1970s poverty intensity in canada and the united states was almost indistinguishable but in the 1970s canadian poverty intensity decreased large increases in poverty intensity occurred in the 1980s in the united states the united kingdom and sweden

on the intergenerational allocation of natural resources it is known hartwick and others that under standard assumptions a society that invests in reproducible capital the competitive rents on its current extraction of exhaustible resources will enjoy a consumption stream constant in time it is shown here that this result can be interpreted as saying that an appropriately defined stock of capital including the initial endowment of resources is being maintained intact and that consumption can be interpreted as the interest on that patrimony this seems like a useful rule of thumb for policy

savings growth and the path of utility we derive an expression relating the change in instantaneous utility to the growth of net genuine saving in an economy with multiple stocks and externalities that maxi mizes welfare in the utilitarian sense this result is then shown to hold for decentralized competitive efficient economies as well to yield an extension of the hartwick rule instan taneous utility is non declining along a development path if genuine saving is decreasing by way of example the rule is applied as a constant genuine saving rate rule in a simple dasgupta heal solow stiglitzeconomy the rule yields a path with unbounded consump tion and higher wealth than on the standard hartwick constant consumption path jel classification q01 q56 o13

does nnp growth indicate welfare improvement abstract we show that instantaneous increases in real nnp over time are an accurate indicator of true dynamic welfare improvements this highlights a connection between the theory of green or comprehensive national income accounting and the theory of real price indices

motivations to remit evidence from botswana in this article a theory of motivations to send remittances is described and tested with data from botswana altruism is one of the motivations tested and found to be an insufficient explanation for remittances among migrants in botswana a refinement of the model stipulates a modified altruism or enlightened self interest in this model the relationship between the migrant and family is tempered by an implicit understanding of mutual benefit the household strategy may be to encourage some members to migrate as a means of spreading risk and sharing gains the household strategy is similar to an insurance policy where migration is to places where market potential is high the risks incurred might be high the example is given of migration during a drought in botswana migrant remittances were greater in households with more cattle or households with more to lose drought alone was not statistically related to remittances increases in remittances were related to increased levels of education it is suggested that repayment was the motive for parents investment in migrants education migrants gains are identified as the potential for an inheritance the security of channeling investments through a trusted family member and security in having a home to return to it is pointed out that the altruism and family remittances from urban migration were strategies that bridged the simple dynamic of either urban development or rural development impacting on family welfare it is suggested that household models of economy adopt some measure to express the relationship of household wealth to remittances from urban migrants

remittances and savings from international migration theory and evidence using a matched sample abstract the central question of this paper concerns the implications of remittance flows for migrants and their origin households in the country of origin this paper represents the first attempt to present a disaggregated view of international remittance flows using a matched sample of international migrants and their origin families i investigate two types of remittances transfers to the home family and savings in the country of origin the empirical evidence provides support for the altruistic model of transfer behavior wealthier origin families tend to receive lower transfers other things being equal however remittances sent to finance origin country investments are positively associated with origin household wealth the estimation strategy addresses two common problems that arise in investigating remittance behavior omitted variable bias and the measurement of origin household resources

wealth accounting exhaustible resources and social welfare the empirical literature on natural resource accounting uses methods which implicitly or explicitly entail measuring changes in total resource asset value when an exhaustible resource is depleted in contrast the growth theoretic literature on saving social welfare and sustainable development is built upon a central finding that the change in real wealth as measured by net or genuine saving is proportional to the change in social welfare we show that the change in total wealth exceeds the change in real wealth in optimal and non optimal models of resource extracting economies this suggests that the change in social welfare is over estimated when the change in total resource asset value is used as the measure of depletion a simple empirical exercise using world bank data on adjusted net saving reinforces the results from theory

estimating remittance functions for pacific island migrants there is concern that pacific island economies dependent on remittances of migrants will endure foreign exchange shortages and declining living standards as remittance levels drop due to lower migration rates and the belief that migrants willingness to remit decreases over time the empirical validity of the remittance decay hypothesis has never been tested from survey data on tongan and western samoan migrants in sydney this paper estimates remittance functions using tobit regression analysis it is found that the remittance decay hypothesis has no empirical validity and migrants are motivated by factors other than altruistic family support including asset accumulation and investment back home c 1997 elsevier science ltd

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

national accounts and environmental resources in the paper optimal growth theory is used to derive the appropriate definition of the net national product concept when there are environmental resources and environmental damage to take into account the basic conclusions are that conventional defined np should be corrected by deducting environmental damage and adding the value of the net change of all resources

capital theory and the measurement of sustainable development an indicator of weak sustainability the measurement of sustainable development is not without considerable difficulties yet this should not detract from the positive advances that can be made in this direction in this paper we present one form that a weak sustainability indicator can take derived from a simple but intuitive savings rule it incorporates the idea that the level of overall capital stock should be non decreasing although subject to qualification at this stage some interesting results emerge from the application of the rule to 18 countries

ecosystem services and regional development an application to sweden this study carries out interregional comparisons of development and sustainable use of natural capital with and without inclusion of non marketed ecosystem services a simple dynamic model of an open economy shows that appropriate adjustment of conventional income accounts includes flow and stock components but excludes explicit entrance of pollution calculations are made for swedish regions and for two types of ecosystem services pollution sequestration and recreational services provided by three types of ecosystems forests agricultural landscape and wetlands when comparing the adjusted and non adjusted regional income accounts it is shown that the two measurements generate significantly different pictures of regional income and growth regions that are traditionally considered as relatively less growth promoting are shown to hold important sources of wealth from natural capital while counties that are rich in conventional accounts fall behind when adjusting for values of changes in natural capital

determinants of remittances the case of the south asian community in manchester this paper investigates the remittance behaviour of the south asian community using new data from indian pakistani and bangladeshi households in manchester the findings show that standard variables such as income employment education linkages to the home country and host country are important determinants of remittances although remittances are sent mainly for consumption purposes those sent for land acquisition and savings have stronger association with the amount of remittances in addition we find strong evidence for the remittance decay hypothesis for indian and pakistani migrants but not for bangladeshi migrants

comparing augmented sustainability measures for scotland is there a mismatch we estimate and compare two empirical measures of the weak sustainability of an economy for the first time the change in augmented green net national product gnnp and the interest on augmented genuine savings gs yearly calculations are given for each measure for scotland during 1992 1999 augmentation means including using projections to 2020 changed production possibilities enabled by exogenous technical progress or changing oil prices the change in augmented gnnp and the interest on augmented gs are both always positive showing no sustainability problem for scotland then according to the assumptions underlying our weak sustainability calculations however the former greatly exceeds the latter even when macroeconomic fluctuations are taken into account this is a mismatch which poses an unresolved problem with the theory resolving it may require respecifying the utility functions used in mainstream growth theory

wealth and sustainable development the role of david pearce green net national product was thought to be one way of measuring sustainable income however david pearce understood that a better measure of sustainable development was to look at what a generation is leaving in form of capital assets to later generations in this article his arguments and insights are highlighted against recent theoretical advances

climate change environmental and technology policies in a strategic context there are a number of features of climate change which make it one of the most challenging problems confronting policy makers and policy analysts in this paper we consider three such features i climate change is a global pollutant so there are strategic interactions between governments over climate policy ii cutting greenhouse gas emissions can have significant cost effects across a number of sectors of the economy raising concerns about the implications of climate change policy on competitive advantage iii the long time scales on which climate change operates means that an important dimension of climate change policy is policy towards r d to cut the costs of dealing with climate change in ulph and ulph 1996 ulph a ulph d 1996 in carraro c katsoulacos y xepapadeas a eds environmental policy and market structure kluwer dordrecht pp 181 208 we presented a model to analyse these issues but considered only environmental policies in this paper we extend that analysis to allow for both a richer set of policy instruments environmental and technology policies and a richer strategic context

remittances and the brain drain revisited the microdata show that more educated migrants remit more two of the most salient trends in migration and development over the last two decades are the large rise in remittances and in the flow of skilled migrants however recent literature based on cross country regressions has claimed that more educated migrants remit less leading to concerns that further increases in skilled migration will impede remittance growth micro data from surveys of immigrants in 11 major destination countries are used to revisit the relationship between education and remitting behavior the data show a mixed pattern between education and the likelihood of remitting and a strong positive relationship between education and amount remitted intensive margin conditional on remitting at all extensive margin combining these intensive and extensive margins yields an overall positive effect of education on the amount remitted for the pooled sample with heterogeneous results across destinations the micro data allow investigation of why the more educated remit more showing that the higher income earned by migrants rather than family characteristics explains much of the higher remittances migration brain drain and education

poverty in america 1970 1990 who did gain ground an application of stochastic dominance criteria employing simultaneous inequality tests in a partial panel atkinson 1987 proposed stochastic dominance criteria for analysing poverty which under certain conditions establish orderings of states for any poverty line and any poverty measure within given class refocusing debate on the nature of the income distribution of the poor employing new empirical techniques these criteria are implemented for the united states from 1970 to 1990 using the panel study of income dynamics results highlight the pivotal role of family size scale economies in consumption indicate different experiences for white versus non white groups and suggest that optimism over the progress of the poor is not warranted copyright 2003 john wiley sons ltd

genuine savings leading indicator of sustainable development abstract the world bank recently began publishing estimates of countries genuine savings a comprehensive measure of net investment across all forms of capital natural and human as well as produced this article presents the first empirical investigation of the consistency of the bank s estimates with the hypothesis that net investment should equal the difference between a country s average future consumption and its current consumption results show that the bank s estimates are consistent only with weak versions of this hypothesis and then only for developing countries moreover a simple autoregressive integrated moving average arima model outperforms any net investment measure comprehensive or conventional as a predictor of the difference between current and future consumption in sum the bank s net investment estimates tend to move in the same direction as the difference between current and average future consumption in developing countries but they have little value for predicting the mag

natural resources national accounting and economic depreciation abstract the current value hamiltonian in an aggregate optimal growth problem with heterogeneous capital stocks including exhaustible renewable and environmental stocks is the nnp function routine substitutions reveal that the using up of natural resource stocks is representable as easy to interpret economic depreciation magnitudes we obtain true nnp inclusive of natural resource stock diminution implications for actual national accounting practices are also discussed

capital gains and income arising from nonrenewable resources should capital gains be included in income arising from nonrenewable resources in the present paper i show that capital gains from a nonrenewable resource can be divided into two terms real price change effects and real interest rate change effects by application of sectoral income theory developed by asheim and wei environ res econ 42 65 87 2009 only the former term is part of real income of the resource and the latter term should not be included this result is significant in the sense that all change in real resource wealth can be included as part of real income only if future real interest rates are assumed to be constant hotelling rule always implies that capital gains from nonrenewable resources coincide with real interests on resource wealth net investment generated from the resource cancels out current cash flow from the resource and real income comes from price change effects

remittances and temporary migration in this paper we study the remittance behavior of immigrants and how it relates to temporary versus permanent migration plans we use a unique data source that provides unusual detail on remittances and return plans and follows the same household over time our data allows us also to distinguish between different purposes of remittances we analyze the association between individual and household characteristics and the geographic location of the family as well as return plans and remittances the panel nature of our data allows us to condition on household fixed effects to address measurement error and reverse causality we use an instrumental variable estimator our results show that changes in return plans are related to large changes in remittance flows

making a difference how environmental economists can influence the policy process a case study of david w pearce can environmental economists influence policy if so how this paper addresses these two questions using the late david pearce s career as a case study influence can be exercised but pearce s career shows that certain conditions must be met the first is desire he wanted to influence policy and directed a high proportion of his efforts to doing so he focused particular attention on the power centres of his time the oecd world bank european commission un uk government his influence was aided by his status and location as a professor in a prestige university ucl in a major global city london his messages were consistent and clear theory is important and can be used to frame most environmental challenges as regards both explanation and solution externalities can be valued assessing benefits and costs of options is important market signals taxes etc and incentives generally are powerful shapers of behaviour stock of capital human built natural is a key measure of sustainability he communicated simply and clearly in words and phrases that ministers for finance and journalists could understand all of the broadsheet newspapers in england financial times guardian independent telegraph times were grist to pearce s mill of advocacy for environmental economics he provided the blueprint books that could be read on a commute and summaries to the media that they could fit into a 1 000 word piece he didn t seek out but neither did he shirk controversy he worked with various interest groups and politicians but never to the point were he was co opted he initiated and directed the msc in environmental and resource economics that created an ever widening and influential pool of advocates for his ideas finally he achieved a prodigious academic output that ensures a sort of immortality and provided the intellectual ballast the enabled his policy influence

gaining ground poverty in the postwar united states official measures of poverty in the united states are compiled by the bureau of the census by comparing a household s income level to a prespecified threshold from a theoretical perspective it is more appropriate to evaluate the level of poverty using a consumption based measure of household welfare in this paper i evaluate the level of poverty using expenditure data from the consumer expenditure survey i find that consumption based poverty rates are much lower than those based on income the trend in the poverty rate in the united states is sensitive to the price index and equivalence scales used to adjust the poverty thresholds

statistical tests of changes in u s poverty 1975 to 1990 since president lyndon johnson declared the war on poverty three decades ago scholars have devoted many volumes to analyzing characteristics of poverty evaluating effectiveness of antipoverty policies and measuring changes in poverty unfortunately most poverty studies have focused primarily on the incidence of poverty rather than on both the incidence of poverty and the income distribution within the poor population although a k sen s 23 seminal work on measurement of poverty demonstrated the importance of constructing and using a distribution sensitive poverty measure in evaluating poverty the u s federal government still uses the proportion of poor as virtually the only indicator of poverty with few exceptions such as bishop formby and smith 5 most recent scholarly works on poverty issues including sawhill 21 hanratty and blank 17 and slesnick 24 are also concerned exclusively with the incidence of poverty and use a single poverty line in this study we demonstrate that a more comprehensive look at poverty using distribution sensitive measures and multiple poverty lines yields a different picture of poverty changes over time compared to what official u s statistics portray practically the comparison of poverty changes can be decomposed into three parts 1 setting a poverty line an income threshold below which a person is defined as poor this step is also called the identification of the poor and is very important in poverty study 2 choosing a method to aggregate individual poverty into overall poverty different methods of aggregating may lead to different conclusions about poverty changes therefore an appropriate method is essential for poverty study and 3 statistical inference since conclusions about poverty changes are drawn from a random sample of the population it is important to know whether the estimated poverty

on the measurement of poverty official statistics in the united states and the united kingdom show a rise in poverty between the 1970 s and the 1980 s but scepticism has been expressed with regard to these findings in particular the methods employed in the measurement of poverty have been the subject of criticism this paper re examines three basic issues in measuring poverty the choice of the poverty line the index of poverty and the relation between poverty and inequality one general theme running through the paper is that there is a diversity of judgments which enter the measurement of poverty and that it is necessary to recognize these explicitly in the procedures adopted there is likely to be disagreement about the choice of poverty line affecting both its level and its structure in this situation we may only be able to make comparisons and not to measure differences and the comparisons may lead only to a partial rather than a complete ordering the first section of the paper discusses the stochastic dominance conditions which allow such comparisons illustrating their application by reference to data for the united states the choice of poverty measure has been the subject of an extensive literature and a variety of measures have been proposed in the second section of the paper a different approach is suggested considering a class of measures satisfying certain general properties and seeking conditions under which all members of the class which includes many of those proposed give the same ranking those sceptical about measures of poverty often assert that poverty and inequality are being confounded the third section of the paper distinguishes four different viewpoints and relates them to theories of justice and views of social welfare

do remittances diminish social violence abstractthis paper represents the first attempt to formalise the relationship between remittances and social violence by developing a model that predicts that migrants remittances lead to the reduction of social violence in the recipient economy under the condition that remittances increase the average product of labour using homicide data as an indicator of social violence we tested our model s prediction controlling for the endogeneity problem with appropriate instruments we found that remittances tend to reduce social violence we performed sensitivity analysis on remittances in the empirical specification and found it robust with an unchanged negative sign

do we really care about biodiversity this paper addresses from an economic perspective the issue of global biodiversity conservation it challenges the perception that the world really cares a great deal about biodiversity and is prepared to pay the full cost of maintaining this stock of natural capital despite the existence of a plethora of international agreements there still seems to be a global deficit of care surrounding efforts to combat challenges such as those posed by global warming and biodiversity conservation more light can be thrown on the degree of care by measuring both the actual expenditures and the stated willingness to pay for biodiversity conservation however actual expenditures are much lower than willingness to pay estimates recorded in the published literature using the criteria that the right amount of conservation effort is one where the marginal economic benefits from conservation just equal the marginal costs of conservation the paper explores the biodiversity conservation conundrum and concluded that on the available evidence the world does not care too much about this natural capital stock and bequests to future generations

assessing the performance of the uk emissions trading scheme the uk s climate change programme introduced an emissions trading scheme ets for greenhouse gases firms in over 40 industrial sectors which have negotiated climate change agreements setting quantitative energy efficiency targets can use the ets to trade over and under compliance with these targets in parallel a limited number of firms have become major participants in the ets as a result of an auction of subsidies for additional abatement commitments the paper describes the uk arrangements and assesses the economic efficiency and environmental effectiveness of the ets drawing on evidence of participants behaviour both in the incentive auction and in subsequent trading

harvesting in an integrated general equilibrium model harvesting of prey biomass is analyzed in an integrated ecological economic system whose submodels a predator prey ecosystem and a simple economy are microfounded dynamic general equilibrium models these submodels are interdependent because the ecosystem responds to harvesting through the reactions of optimizing individual organisms by changing the provision of public ecosystem services to consumers general analytical results are derived regarding the impact of harvesting policies on short run equilibria of both submodels on population dynamics and on stationary states of the integrated model a key insight is that prey biomass carries a positive ecosystem price which needs to be added as a tax mark up to the economic price of harvested biomass to attain allocative efficiency further information on the dynamics is gained by resorting to numerical analysis of the policy regimes of zero harvesting laissez faire harvesting and efficient harvesting it is a matter of weighing costs and benefits of taking action whether the action is the inert one of leaving resources alone in order to conserve them or whether it involves exploiting a resource for so called material ends pearce 1976 p 320

investing exhaustible resource rents and the path of consumption we set out dollar valued net national product for an economy with a wasting essential stock oil deposit we take up maintaining capital intact and locally unchan ging consumption the percentage change in net investment or genuine savings relative to the market rate of interest denotes whether current consumption is rising