heterogeneity in intention to adopt organic strawberry production practices among producers in the federal district brazil abstract despite its benefits adoption of organic farming is low in brazil we used the theory of planned behavior to determine factors that influenced a farmer s decision to adopt organic production methods and identify key social psychological barriers we focused on strawberry production as a model and surveyed 83 conventional strawberry farmers response rate 90 2 and found that attitudes and perceived behavioral control pbc predicted intent to adopt organic production r2 37 2 for farmers interested in conversion beliefs about the improved social financial status from conversion were positively related to their attitude toward conversion and the lack of control over informational and physical resources was negatively related to pbc for farmers disinterested in conversion the influence of their social norms was stronger than for interested farmers and pbc most strongly influenced their intention to convert these results suggest that different strategies should be pursued for encouraging conversion to organic strawberry production for interested farmers their interest may be enhanced by addressing their attitudinal beliefs and allaying concerns over access to technical assistance for disinterested producers it may be important to raise the salience of their positive attitudinal beliefs involve people whose opinions they value and enhance their perceived control over information and risks

the ethics of intertemporal distribution in a warming planet this paper evaluates from the ethical viewpoint current work by economists on intergenerational resource allocation in the presence of global warming we begin by attempting to elucidate the debate that has recently occurred on the appropriate choice of the discountrate weofferthreejustificationsformaximizingthediscountedsumofgenerational utilities and find only one of these to be a satisfactory justification of that practice the pos sibility that the human species may become extinct this implies that a very small discount rate large discount factor should be used we argue that the justification for discounting inherent in the approaches taken by many economists is that of the present generation of hegemon which is unacceptable the role of the ramsey equation in deducing the discount rate in these theories is explained as an alternative to discounted utilitarianism we propose a principle of sustainability we describe optimal paths that have been calculated for the sus tainabilitiarian rawlsian objectivefunction andpathsthatwillsustaingrowthinwelfare at a positive rate we report results concerning optimal paths when the uncertainty of existence of future generations is taken into account in sharp contrast to the utilitarian model it turns out that under some conditions the sustainabilitarian can ignore the uncertainty regarding thedateatwhichhumansbecomeextinct thereisastrikingdifferencebetweenthesolutions of the discounted utilitarian program and the sustainabilitarian program under uncertainty

gender differences in the allocation of assets in retirement savings plans in 1995 40 percent of working men and 32 percent of working women were covered by a defined contribution dc plan a distinguishing characteristic of these plans is that workers can generally choose how their assets are invested using data from the 1992 and 1995 surveys of consumer finances scf this paper examines whether workers differ systematically by gender in the allocation of assets in dc plans previous researchers have reported that many workers tend to invest their retirement assets too conservatively and in particular that women are less likely than men to invest in risky assets such as stocks in the presence of an equity premium a lower propensity by women to invest in stocks could translate into large differences in the accumulation of financial wealth for retirement we establish that gender differences in investment decisions exist though they are more complicated than previous studies have suggested we show that these differences are not completely explained by differences in individual or household characteristics a few studies have examined gender differences in investment decisions vickie l bajtelsmit and jack l vanderhei 1997 richard p hinz et al 1997 these studies use administrative data and report that women tend to invest their retirement funds in less risky vehicles than men michael haliassos and carol c bertaut 1995 use the 1983 scf to examine why such a large fraction of households do not own any stock they report that gender does not have a significant effect on the probability of owning stock though gender differences are not the focus of their paper what these data sources lack haliassos and bertaut being the exception is a rich set of demographic and other variables on households that theory predicts should affect investment behavior this paper adds to the literature by examining gender differences in investment decisions conditioning on such variables the results highlight the importance of including marital status risk aversion measures and the portfolio of assets held outside dc plans when examining gender differences in investment decisions in these plans

are women really more risk averse than men a re analysis of the literature using expanded methods while a substantial literature in economics and finance has concluded that women are more risk averse than men this conclusion merits investigation after briefly clarifying the difference between making generalizations about groups on the one hand and making valid inferences from samples on the other this essay suggests improvements to how economists communicate our research results supplementing findings of statistical significance with quantitative measures of both substantive difference cohen s d a measure in common use in non economics literatures and of substantive overlap the index of similarity newly proposed here adds important nuance to the discussion of sex differences these measures are computed from the data on men women and risk used in 35 scholarly works from economics finance and decision science the results are considerably more mixed and overlapping than would commonly be inferred from the broad claims made in the literature with standardized differences in means mostly amounting to considerably less than one standard deviation and the degree of overlap between male and female distributions generally exceeding 80 in addition studies that look at contextual influences suggest that these contribute importantly to observations of differences both between and within the sexes

optimal growth resource amenities and the preservation of natural environments this paper examines the conditions for which it is optimal to permanently preserve natural environments in which a productive natural resource is found the conditions are more restrictive than those previously indicated in the literature on the economics of natural environments increasing consumption and declining commodity prices are not sufficient to warrant permanent preservation the initial capital stock can be an important determinant of the optimal level of preservation in addition resource amenity values will increase the initial resource price and decrease the rate of growth of the resource price the natural world provides a variety of services to the human community natural resources are essential inputs in the production of goods and services in addition the natural world generates a variety of amenity services including the scientific recreational and aesthetic value of preserved natural environments krutilla 1967 krutilla and fisher 1975a this paper examines the impact of resource amenity values on the optimal growth of an economy which depends upon natural resource inputs for the production of goods and services in particular the paper examines the conditions under which it is optimal to permanently preserve some natural environments in which the productive resource is found the conditions which warrant permanent preservation are more restrictive than previously indicated by the literature on the economics of natural environments increasing consumption and declining commodity prices are not sufficient to warrant permanent preservation in addition the initial capital endowment can be an important determinant of the optimal level of preservation

are women more risk averse we find that single women exhibit relatively more risk aversion in financial decision making than single men using u s sample data we examine household holdings of risky assets to determine whether there are gender differences in financial risk taking as wealth increases the proportion of wealth held as risky assets is estimated to increase by a smaller amount for single women than for single men gender differences in financial risk taking are also influenced by age race and number of children greater financial risk aversion may provide an explanation for women s lower levels of wealth compared with men s jel j16 d81 g11

risk sharing networks and insurance against illness most risk sharing tests on developing country data are conducted at the level of the village generally the full risk sharing hypothesis is rejected this paper uses detailed data on all insurance networks within a village in tanzania networks are not clustered but largely overlapping we test whether full risk sharing occurs within these networks while village level full insurance cannot be rejected for food consumption we find evidence consistent with at least partial insurance of non food consumption via networks

gender based risk aversion and retirement asset allocation this research examines whether women have higher risk aversion than men as demonstrated by their retirement asset allocation the analysis is extended to investigate how retirement asset investment decisions are made in married households initial results suggest controlling for demographic income and wealth differences lead to no significant difference in the proportion of retirement assets held in stocks between women and male faculty for married households with joint investment decision making results indicate that gender differences are a significant factor in explaining individual retirement asset allocation our estimates imply that women faculty are more risk averse than their male spouse jel j16 g11 d10

informal insurance arrangements with limited commitment theory and evidence from village economies recent work on consumption allocations in village economies finds that idiosyncratic variation in consumption is systematically related to idiosyncratic variation in income thus rejecting the hypothesis of full risk pooling we attempt to explain these observations by adding limited commitment as an impediment to risk pooling we provide a general dynamic model and completely characterise efficient informal insurance arrangements constrained by limited commitment and test the model using data from three indian villages we find that the model can fully explain the dynamic response of consumption to income but that it fails to explain the distribution of consumption across households

ecological macroeconomics in the open economy sustainability unequal exchange and policy coordination in a center periphery model abstract this article introduces a novel environmental interpretation of a keynesian coordination game and develops four potential scenarios to remaining within a global carbon emissions constraint with inspiration from research on ecologically unequal exchange eue we demonstrate the drawbacks of present green growth strategies by considering how pollution and resource intensive industries are distributed unevenly in the world economy with large and increasing negative impacts on the periphery the situation may only be exacerbated if the reduction of emissions in the center is based on shifting heavy industries and extractive enterprises to low cost producers in the periphery in this way existing research likely overemphasizes the capacity of green investment policy to achieve sustainable outcomes our scenarios show that achieving global sustainability and improving global equity will require an impressive level of coordination between the center and periphery as well as a significant reduction in the rate of growth degrowth in the center

intertemporal distribution sufficiency and the social cost of carbon abstract we explore how the intertemporal distribution of well being affects the social cost of carbon in contrast to the literature that studies parameters of a particular social welfare function such as the discount rate we shift the focus and directly assume a parametric form for the intertemporal distribution of well being this has the advantage of avoiding explicit discounting choices which has initiated much debate specifically we consider a set of intertemporal distributions that reach a steady state at a pre specified level of sufficient well being or equivalently after a pre specified end of growth horizon we numerically illustrate our results in dice and find that the social cost of carbon increases over proportionally with the sufficiency level of well being while the social cost of carbon in 2015 is us 7 if the sufficiency level is four fold the present level it is us 30 if the sufficiency level is 15 fold and us 100 if the sufficiency level is 26 fold the present level this shows in a transparent way how conceptions of intergenerational distributive justice drive the social cost of carbon

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

household consumption smoothing through ethnic ties evidence from cote d ivoire abstract this paper investigates the hypothesis that households in cote d ivoire take part in spatially diversified risk sharing arrangements with members of their own ethnic group empirical tests are presented using several estimation methods to deal with heteroscedasticity measurement error and extreme value problems to examine whether results are robust across estimation procedures the hypothesis of complete risk sharing within ethnic groups is rejected however there appears to be some partial insurance performed by individual households with other members of the same ethnic group particularly for the households residing in the regions least likely to have access to formal financial arrangements

precautionary saving under liquidity constraints evidence from rural pakistan this paper investigates precautionary saving under liquidity constraints in pakistan using household panel data in particular while we estimates kimball s 1990 prudence parameter we deviate from dynan s 1993 framework by explicitly considering liquidity constraints as in zeldes 1989 by doing so we attempt to differentiate the standard precautionary saving caused by uncertainty from the one due to liquidity constraints furthermore endogenous liquidity constraints are considered to resolve issues of selection biases in this study we document substantial evidence of the presence of precautionary saving in pakistan more specifically the estimated prudence is significantly higher for liquidity constrained households as compared with unconstrained ones the results support the emerging view that facilitating saving may often be more important than finding better ways of lending to the poor

the formation of risk sharing networks this paper examines the formation of risk sharing networks in the rural philippines we find that geographic proximity possibly correlated with kinship is a major determinant of mutual insurance links among villagers age and wealth differences also play an important role in contrast income correlation and differences in occupation are not determinants of network links reported network links have a strong effect on subsequent gifts and loans gifts between network partners are found to respond to shocks and to differences in health status from this we conclude that intra village mutual insurance links are largely determined by social and geographical proximity and are only weakly the result of purposeful diversification of income risk the paper also makes a methodological contribution to the estimation of dyadic models

gender differences in competitiveness and risk taking comparing children in colombia and sweden we explore gender differences in preferences for competition and risk among children aged 912 in colombia and sweden two countries differing in gender equality according to macro indices we include four types of tasks that vary in gender stereotyping when looking at competitiveness running skipping rope math and word search we find that boys and girls are equally competitive in all tasks and all measures in colombia unlike the consistent results in colombia the results in sweden are mixed with some indication of girls being more competitive than boys in some tasks in terms of performance change whereas boys are more likely to choose to compete in general boys in both countries are more risk taking than girls with a smaller gender gap in sweden

changing patterns of wealth distribution evidence from ghana a largely unexplored feature of structural transformation is the change in the composition of an economy s asset holdings in most poor economies assets are concentrated in land in rich economies

an environmental economic measure of sustainable development abstract a central issue in the study of sustainable development is the interplay of growth and sacrifice in a dynamic economy this paper investigates the relationship among current consumption sacrifice and sustainability improvement in a general context and in two canonical stylized economies we argue that the maximin value of utility measures what is sustainable and provides the limit to growth maximin value is interpreted as a dynamic environmental economic carrying capacity and current utility as an environmental economic footprint the time derivative of maximin value is interpreted as net investment in sustainability improvement it is called durable savings to distinguish it from genuine savings usually computed with discounted utilitarian prices

asset smoothing consumption smoothing and the reproduction of inequality under risk and subsistence constraints abstract a growing literature asks whether low wealth agents can accumulate assets over time or whether they are trapped in poverty this paper develops a stochastic dynamic programming model with endogenous asset price risk to explore savings and portfolio decisions in a resource poor environment characterized by risk and subsistence constraints optimal portfolio strategies are found to bifurcate despite divisible assets and fully rational agents wealthier agents acquire a higher yielding portfolio and pursue conventional consumption smoothing poorer agents acquire a less remunerative portfolio and pursue asset smoothing rather than consumption smoothing asset based risk coping thus results in positive correlation between initial wealth and portfolio rate of return

consumption insurance an evaluation of risk bearing systems in low income economies the hypothesis of full risk sharing can be taken to data from low income countries and evaluate formal and informal financial systems in many contexts idiosyncratic risks are high so credit insurance arrangements could be beneficial statistical tests reveal that households in southern india take advantage of these possibilities villages in cote d ivoire and countries in thailand do not do as well the paper includes an empirical description of the devices used to smooth consumption and a theoretical discussion of private information and incentives on ideal operating systems the full information and mechanism design frameworks provide benchmarks for policy analysis

greenhouse gas abatement cost curves of the residential heating market a microeconomic approach in this paper we develop a microeconomic approach to deduce greenhouse gas abatement cost curves of the residential heating sector our research is based on a system dynamics microsimulation of private households investment decisions for heating systems to the year 2030 by accounting for household specific characteristics we investigate the welfare costs of different abatement policies in terms of the compensating variation and the excess burden we investigate two policies i a carbon tax and ii subsidies on heating system investments we deduce abatement cost curves for both policies by simulating welfare costs and greenhouse gas emissions to the year 2030 we find that i welfare based abatement costs are generally higher than pure technical equipment costs ii given utility maximizing households a carbon tax is the most welfare efficient policy and iii if households are not utility maximizing a subsidy on investments may have lower marginal greenhouse gas abatement costs than a carbon tax

asset allocation and individual risk aversion 1992 asset allocation and individual risk aversion financial analysts journal vol 48 no 6 pp 32 37

a review of the stern review on the economics of climate change the stern review calls for immediate decisive action to stabilize greenhouse gases because the benefits of strong early action on climate change outweighs the costs the economic analysis supporting this conclusion consists mostly of two basic strands the first strand is a formal aggregative model that relies for its conclusions primari ly upon imposing a very low discount rate concerning this discount rate aspect i am skeptical of the review s formal analysis but this essay points out that we are actual ly a lot less sure about what interest rate should be used for discounting climate change than is commonly acknowledged the review s second basic strand is a more intuitive argument that it might be very important to avoid possibly large uncertain ties that are difficult to quantify concerning this uncertainty aspect i argue that it might be recast into sound analytical reasoning that might justify some of the review s conclusions the basic issue here is that spending money to slow global warming should perhaps not be conceptualized primarily as being about consump tion smoothing as much as being about how much insurance to buy to offset the small change of a ruinous catastrophe that is difficult to compensate by ordinary savings

in search of homo economicus behavioral experiments in 15 small scale societies we can summarize our results as follows first the canonical model is not supported in any society studied second there is considerably more behavioral variability across groups than had been found in previous cross cultural research and the canonical model fails in a wider variety of ways than in previous experiments third group level differences in economic organization and the degree of market integration explain a substantial portion of the behavioral variation across societies the higher the degree of market integration and the higher the payoffs to cooperation the greater the level of cooperation in experimental games fourth individual level economic and demographic variables do not explain behavior either within or across groups fifth behavior in the experiments is generally consistent with economic patterns of everyday life in these societies

prioritarianism and climate change prioritarianism is the ethical view that gives greater weight to well being changes affecting individuals at lower well being levels this view is influential both in moral philosophy and in theoretical work on social choice where it is captured by a social welfare function swf summing a concave transformation of individual well being numbers however prioritarianism has largely been ignored by scholarship on climate change this article compares utilitarianism and prioritarianism as frameworks for evaluating climate policy it reviews the distinctive normative choices that are required for the prioritarian approach specifying a ratio scale for well being if the prioritarian swf takes the standard atkinson form determining the degree of concavity of the transformation function i e the degree of social inequality aversion and choosing between ex ante and ex post prioritarianism under conditions of risk the article also sketches some of salient implications of a prioritarian swf for climate policy with respect to the social cost of carbon the social discount rate optimal mitigation and the dismal theorem finally it discusses the issue of variable population

a dynamic analysis of human welfare in a warming planet anthropogenic greenhouse gas ghg emissions have caused atmospheric concentrations with no precedents in the last half a million years inducing serious uncertainties about future climates and their effects on human welfare recent climate science supports the view that the climate stabilization will require very low ghg emissions in the future we ask is a path of low emissions compatible with sustainable levels of human welfare with steady growth in human quality of life addressing these questions requires both defining welfare criteria and empirically estimating the possible paths of the economy we specify and calibrate a dynamic model with four intertemporal links education physical capital knowledge and the environment in line with nordhaus 2008a and with the stern review 2007 we assume that ghg emissions allow increased production while a higher stock of atmospheric carbon decreases production our index of human welfare which we call quality of life quol emphasizes education knowledge and the environment affected by greenhouse gas emissions in addition to consumption and leisure thus we avoid a consumptionist fallacy that welfare depends only on commodity consumption and perhaps leisure we reject discounted utilitarianism as a normative criterion and consider two alternatives the first is an intergenerational maximin criterion which maximizes the quality of life of the first generation subject to maintaining at least that level for all successive generations the second is human development optimization that seeks the maximization of the quol of the first generation subject to achieving a given constant rate of growth in all subsequent generations hence our analysis focuses on a human notion of sustainability as opposed to the conventional green sustainability limited to keeping the quality of the environment constant because our dynamic optimization programs defy explicit analytical solutions our approach has been computational as a benchmark we consider a simple model with physical and human capital for which we prove a turnpike theorem we then devise a computational algorithm inspired by the turnpike property to construct feasible although not necessarily optimal paths in the more complex and realistic model our analysis indicates that with ghg emission paths entailing very low emissions in the future positive rates of growth in quol are possible while the first generation experiences a quol higher than the historical reference level we also observe a tradeoff between the quality of life of the first generation and the rate of growth in the quality of life yet generation 1 s sacrifice for the sake of a higher growth rate appears to be small the paths that we compute involve investments in knowledge at noticeably higher levels than in the past

simulating the diffusion of organic farming practices in two new eu member states abstract agriculture continues to be a major contributor to water pollution climate change and loss of biodiversity although policies to encourage farmers to work to higher sustainability standards in food and energy crop production have increased throughout the european union in new member states accession to the european union mostly brought a substantially increased public support to foster the diffusion of certified organic farming however the take up of organic farming is varied for reasons that are not yet well understood in this paper we analyse the diffusion of organic farming through farm populations this involves an understanding of farmer behaviour and how it can change over time we present a generic agent based model that builds on the theory of planned behaviour as framework for understanding and modelling farmers decision making processes the model is applied to high diffusion regions in two new eu member states latvia and estonia the values for the model s parameters are informed by survey data the model reproduces the interdependence of social influence and economic factors social influence alone is shown to make little difference to the model dynamics organic farmers remain organic and conventional farmers remain conventional introducing a change to the environment e g a subsidy results in an increase in the proportion of adopters thus economic factors appear to be more influential than social factors however only when allowing for both the subsidy and social influence do we reveal the whole picture and the combined adoption rate is higher than the sum of the proportion of adopters resulting from just social influence without a subsidy and from just a subsidy without social influence we also compare the effect of the subsidy with the effect of influence from organic farm advisors to develop policy recommendations

once more on intergenerational discounting in climate change analysis reply to partha dasgupta discounting the utilities of future generations in many problems such as climate change analysis has several justifications only one of which can be supported by ethics which postulate that every individual no matter when born has an equal right to well being that justification is that future generations may not exist in an earlier article published here i explained this view and criticized economists who deviate from it the practical aspect of this deviation is to choose discount rates which are far too high thus relegating future generations to lower utility than they a priori have a right to as well many economists continue to rely upon a utilitarian ethic a reliance which is independent of the discounting issue but which i also criticize dasgupta responded to my article the present article is a response to dasgupta

liberal egalitarianism and the harm principle this paper analyses the implications of classical liberal and libertarian approaches for distributive justice in the context of social welfare orderings an axiom capturing a liberal non interfering view of society named the weak harm principle is studied whose roots can be traced back to john stuart mill s essay on liberty it is shown that liberal views of individual autonomy and freedom can provide consistent foundations for social welfare judgements in both the finite and the infinite context in particular a liberal non interfering approach can help to adjudicate some fundamental distributive issues relative to intergenerational justice however a surprisingly strong and general relation is established between liberal views of individual autonomy and non interference and egalitarian principles in the rawlsian tradition

understanding the uptake of organic farming accounting for heterogeneities among irish farmers abstract this paper examines the decisions of irish farmers to convert to organic farming by applying the theory of planned behaviour to control for social influence and technical constraints cluster analysis and principal component analysis are utilised to account for sample heterogeneity and to identify heterogeneities in farmer beliefs regarding adoption of organic methods the results indicate that the impact of economic incentives and technical barriers varies while social acceptance of organic farming constrains adoption these findings suggest that policy incentives mainly based on subsidy payments may be insufficient to increase the organic sector in the presence of social and technical barriers

are women as likely to take risks and compete behavioural findings from central vietnam using controlled experiments to compare the risk attitude and willingness to compete of husbands and wives in 500 couples in rural vietnam we find that women are more risk averse than men and that compared to men women are less likely to choose to compete irrespective of how likely they are to succeed relevant to development programmes concerned with lifting women out of poverty our findings suggest that women may be more reluctant to adopt new technologies take out loans or engage in economic activities that offer higher expected returns in order to avoid setups that require them to be more competitive or that have less predictable outcomes

correcting the climate externality pareto improvements across generations and regions many argue that the present generation must reduce consumption to mitigate future climate change however as significant climate change is due to market failure the correction of market failures by definition gives rise to the possibility of pareto improvements in this paper we examine the implications of pareto improvements both within and across generations we employ the representative consumer model rice 10 a global model including different regions to see how we could potentially distribute any benefits across and within generations such that nobody loses the model shows that different combinations of present and future consumption along the pareto improving frontier yield different combinations of capital investment and emissions we also calculate a conventional social optimum while the social optimum by definition is on the pareto efficiency frontier it is not necessarily on the pareto improving segment of this frontier total emissions and hence temperature change vary significantly across different pareto improving scenarios it obviously matters which generations get the utility gain and one of our results is that for pareto improvements where none of the gain goes to the distant future and allowing transfers total emissions will be higher than in the social optimum even without any welfare gain to the distant future total emissions may be lower in the pareto improving scenarios we have considered than under the social optimum if transfers are not permitted moreover in this case carbon taxes differ substantially across regions for all pareto improvements

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are we consuming too much this paper articulates and applies frameworks for examining whether consumption is excessive we consider two criteria for the possible excessiveness or insufficiency of current consumption one is an intertemporal utility maximization criterion actual current consumption is deemed excessive if it is higher than the level of current consumption on the consumption path that maximizes the present discounted value of utility the other is a sustainability criterion which requires that current consumption be consistent with non declining living standards over time we extend previous theoretical approaches by offering a formula for the sustainability criterion that accounts for population growth and technological change in applying this formula we find that some poor regions of the world are failing to meet the sustainability criterion in these regions genuine wealth per capita is falling as investments in human and manufactured capital are not sufficient to offset the depletion of natural capital

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

sustainability of an economy relying on two reproducible assets evaluating the sustainability of a society requires a system of shadow or accounting values derived from the sustainability objective as a first step toward the derivation of such shadow values for a maximin objective this paper studies an economy composed of two reproducible assets each producing one of two consumption goods the effect of the substitutability between goods in utility is studied by postulating in turn neoclassical diminishing marginal substitutability perfect substitutability and perfect complementarity the degree of substitutability has strong effects on the maximin solution affecting the regularity or non regularity of the program and on the accounting values this has important consequences for the computation of genuine savings and the sustainability prospects of future generations

financial decision making are women really more risk averse 40 males 33 females gain gambling gain domain loss gambling loss domain a contextual frames b abstract gambling frames studies the application of experimental methods provided stronger control of the economic environment in which decisions were made we elicited data which call into question the prevalence of stereotypic risk attitudes in financial decision making first we find that the comparative risk propensity of male and female subjects is strongly dependent on the financial decision setting second and more important we observe no gender differences in risk propensity when subjects face contextual decisions since in practice financial decisions are always contextual our results suggest that the above gender stereotype may not reflect true male and female attitudes toward financial risks i gender specific risk behavior an experimental design our experiment was designed to examine gender specific risk propensity in decisions relevant for investors and managers table 1 gives an overview of the experimental design in the main treatment we implemented risky choices in the form of investment and insurance decisions choice behavior in this treatment henceforth called the context treatment directly measures the risk behavior of male and female subjects in contextual financial decisions we also ran a control treatment in which the same risky choices were presented as abstract gambling decisions this control treatment henceforth called the abstract treatment allows us to validate the risk behavior induced by our experimental procedure in the light of the above mentioned gambling evidence in the context treatment subjects were confronted with risky choices in two different decision contexts subjects first had to complete a series of investment decisions they were then presented with a series of identical choices this time however framed as insur1 wealth effects from income differences outside the laboratory may still affect risk behavior in our experiment they are controlled for in our model 2 experimental instructions are available in german from the authors or in english from our web page www wif ethz ch publikationen htm ance decisions each investment and insurance decision incorporated a choice between a risky lottery and a certain payoff with the series of choices implemented in the two frames we elicited our subjects certainty equivalents for the same four risky lotteries l1 l2 l3 l4 in both contexts we implemented two frames in the context treatment in order to measure the risk propensity of subjects toward both perceived gains and perceived losses in both frames all possible payoffs for each decision were positive in the investment frame these payoffs were also presented as gains while in the insurance frame the same payoffs were presented as losses relative to an initial endowment therefore elicited certainty equivalents in the investment frame measure subjects risk propensities in the gain domain while certainty equivalents in the insurance frame measure risk propensity in the loss domain if in contextual financial decisions female subjects are generally more risk averse than men our results should display ceteris paribus lower female certainty equivalents in both the investment and insurance frames 3 the four lotteries l1 l2 l3 and l4 each had two possible outcomes payoffs in swiss francs 1 sfr a 0 60 and their probabilities were 30 sfr 6 10 sfr 6 30 sfr 2 10 sfr 2 30 sfr 6 10 sfr 6 and 50 sfr 2 20 sfr 2 respectively 4 experimental evidence suggests that individual risk propensity will vary systematically between the gain and loss domain daniel kahneman and amos tversky 1979 383 vol 89 no 2 gender and economic transactions 3y16 my68 mp 383 friday dec 10 08 20 am lp aer my68 figure 1 differences in mean certainty equivalents ce between male and female subjects by frame note certainty equivalents and male female differences are measured in swiss francs in the abstract treatment we confronted a different group of subjects with exactly the same risky decisions as those in the main treatment however as mentioned before all choices in this control treatment were framed as abstract gambling decisions again two frames were implemented in the gaingambling and loss gambling frames we measured the risk attitudes of subjects toward gambles in the gain and loss domain respectively subjects in both treatments were told in advance that one of their choices would determine their experimental earnings further all subjects completed a post experimental questionnaire which yielded information on each subject s disposable income this information is necessary to exclude wealth effects due to income differences outside the laboratory as an explanation of gender specific choice behavior

decreasing relative risk aversion and tests of risk sharing the relative risk aversion rra coefficient of a household whose consumption is close to the subsistence level may be very high for example if consumption is exactly at the subsistence level the household may not be willing to bear any risk if this is the case then the rra coefficient must be a decreasing function of wealth for poor households therefore we should allow the possibility of decreasing rra drra in testing the full risk sharing hypothesis however existing tests in the empirical literature are derived using preferences that exhibit either increasing or constant rra even when they are applied to data containing low income households we therefore use a hyperbolic absolute risk aversion hara utility which implies increasing constant and decreasing rra as special cases to test full risk sharing hypothesis using the international food policy research institute ifpri and the international crops research institute of the semi arid tropics icrisat household level data sets we find evidence in support of the drra hypothesis along with evidence favoring full risk sharing hypothesis at the village level and evidence against the hypothesis at the inter village level when rra is restricted to be constant we replicate the previous results in the literature reject the full risk sharing hypothesis at both levels our tests however reject this restriction and favor drra in almost all cases these results suggest that it is important to allow for drra in testing the full risk sharing hypothesis when data containing low income households are investigated this abstract was borrowed from another version of this item this abstract was borrowed from another version of this item this abstract was borrowed from another version of this item this abstract was borrowed from another version of this item this abstract was borrowed from another version of this this abstract was borrowed from another version of this item

risk and household grain management in developing countries a dynamic model is presented of a household s joint production storage and trade decisions when facing transaction costs and risk in prices and yields grain management decisions balance the goals of maximising profits and reducing consumption price risk model solutions calibrated to chinese data show that grain s consumption role makes it an attractive form of precautionary saving even when households have access to credit the joint nature of production and savings decisions limits the income loss associated with risk coping and the desire to store grain can explain why subsistence households are frequently net purchasers but rarely net sellers of grain

consumption risk sharing in social networks we develop a model of informal risk sharing in social networks where relationships between individuals can be used as social collateral to enforce insurance payments we characterize incentive compatible risk sharing arrangements and obtain two results 1 the degree of informal insurance is governed by the expansiveness of the network measured by the number of connections that groups of agents have with the rest of the community relative to group size twodimensional networks where people have connections in multiple directions are su ciently expansive to allow very good risk sharing we show that social networks in peruvian villages satisfy this dimensionality property thus our model can explain townsend s 1994 puzzling observation that village communities often exhibit close to full insurance 2 in second best arrangements agents organize in endogenous risk sharing islands in the network where shocks are shared fully within but imperfectly across islands as a result network based risk sharing is local socially closer agents insure each other more

on sustainability and social welfare abstract this paper proposes to define sustainability in terms of leaving it possible for future generations to sustain certain defined targets it is shown that variants of genuine savings and the ecological footprint can then serve as indicators of sustainability the link between sustainability and intergenerational welfare is examined and it is shown how to incorporate indicators of sustainability into a social welfare measure including risk in the analysis

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

a review of the stern review on the economics of climate change how much and how fast should we react to the threat of global warming the stern review argues that the damages from climate change are large and that nations should undertake sharp and immediate reductions in greenhouse gas emissions an examination of the review s radical revision of the economics of climate change finds however that it depends decisively on the assumption of a near zero time discount rate combined with a specific utility function the review s unambiguous conclusions about the need for extreme immediate action will not survive the substitution of assumptions that are consistent with today s marketplace real interest rates and savings rates

self production friction and risk sharing against disasters evidence from a developing country summary this paper uses a unique household data set collected in vietnam to empirically test the necessary conditions for an extended version of the consumption risk sharing hypothesis the test explicitly incorporates self production and uses natural disasters such as avian influenza droughts and floods to identify the effectiveness of market and non market risk sharing mechanisms with these additional treatments full risk sharing within each commune cannot be rejected which suggests the presence of omitted variable and endogeneity biases in existing studies that reject full risk sharing we also find that credit constraints have a significant impact although limited commitment is not necessarily serious

is risk fully pooled within the household evidence from ghana using detailed household survey data from ghana this paper examines whether the transitory incomes of individual household members affect household expenditure patterns divided into six sections the themes include risk sharing networks household survey data from ghana theoretical framework of risk sharing within households estimating transitory income and effects on household budget shares the conclusion that transitory incomes earned by different members of the household have different effects on household expenditure patterns this implies that household members do not engage in full risk pooling with each other moreover it is not always the case that all women or all men display similar preferences or risk pooling behavior this suggests complex features within the household risk sharing structure which is more complex than might be hypothesized by a simplistic analysis framed along gender lines

gender differences in risk behavior an analysis of asset allocation decisions in ghana abstract within a developing country context little is known about gender differences in risk preferences as reflected in asset allocation decisions much of the empirical literature within development studies on risk and investment in assets centers on risk coping and risk management strategies of households with some exceptions this literature primarily focuses on household and household level outcomes previous experimental studies have explored gender differences in risk preferences in developing countries with inconclusive results using unique national representative sex disaggregated data with self reported asset ownership and wealth information of individuals within households in ghana from a multi country project the gender asset gap project this paper explores men and women s risk preferences as reflected in asset allocation decisions through a decomposition method typically used to explore gender differences in wage employment the study finds that although women hold significantly fewer risky assets than men in absolute terms and as a proportion of their wealth in the sample men and women do not have systematically different risk preferences the results in this paper differ from the results in many empirical studies in developed countries where women are often found to be more risk averse than men as the first study to look at gender differences in risk aversion in terms of asset allocation with in the developing country context the results from this study provide evidence that gender differences in risk attitudes may vary by cultural context as the growing experimental literature in developing countries suggests