profits and poverty certification s troubled link for nicaragua s organic and fairtrade coffee producers abstract governments donors and ngos have promoted environmental and social certification schemes for coffee producers as certified market channels are assumed to offer higher prices and better incomes additionally it is presumed that these certifications contribute to poverty reduction of smallholders yet gross margins profits and poverty levels of certified smallholder coffee producers have not yet been quantitatively analyzed applying random sampling techniques our quantitative household survey of 327 randomly selected members of conventional organic and organic fairtrade certified cooperatives in nicaragua is complemented by over a hundred qualitative in depth interviews the results show that although farm gate prices of certified coffees are higher than of conventional coffees the profitability of certified coffee production and its subsequent effect on poverty levels is not clear cut per capita net coffee incomes are insufficient to cover basic needs of all coffee producing households certified producers are more often found below the absolute poverty line than conventional producers over a period of ten years our analysis shows that organic and organic fairtrade farmers have become poorer relative to conventional producers we conclude that coffee yield levels profitability and efficiency need to be increased because prices for certified coffee cannot compensate for low productivity land or labor constraints

asset inequality matters an assessment of the world bank s approach to poverty reduction the fight against poverty has been adopted by the multilateral development banks as their principal objective almost three decades after robert mcnamara announced that the world bank s fundamental work was to improve the lives of the poor its new president james wolfensohn has reiterated that poverty reduction is the world bank s principal purpose similarly in 1994 the inter american development bank set social progress and social equity as its central objective the emphasis in the international institutions contrasts with disappointing results in the real world although life expectancy school enrollmuent and other indicators of social wellbeing have improved dramatically across the developing world and although the proportion of the poor has declined in the last few decades the absolute number of poor people in the world has actually increased today about 1 3 billion people in less developed countries still subsist on less than 1 per day world bank 1980 1990 1996 the case of latin america is dramatic while in the 1970 s the number of poor fell it nearly doubled in the 1980 s increasing from about 80 to almost 150 million and in the last few years the number of poor now 33 percent of the total population has failed to fall despite economic recovery birdsall and londofio 1997 the contrast between the multilateral banks goals and these disappointing results suggests the need for a critical reassessment of their approach to poverty reduction in this paper we describe the approach reflected in the work of world bank economists and based on new empirical work assess its relevance for latin america

on success and dissolution of the labor managed firm in the capitalist economy labor managed firms lmfs in the developed capitalist economy exhibit an interesting life cycle pattern often they come into existence as a way of reorganizing insolvent entrepreneurial profit maximizing firms yet successful lmfs tend to be assimilated to the entrepreneurial modus operandi in the long run i propose a simple theoretical model that explains this lmf phenomenon as the outcome of the lmf s interaction with outside markets especially competitive spot labor markets the interpretations and limitations of the model are also discussed as the basic framework is extended to deal with imperfections in capital markets and with contractual labor markets

multi period mean variance portfolio selection with stochastic interest rate and uncontrollable liability abstract while the literature on dynamic portfolio selection with stochastic interest rates only confines its investigation to the continuous time setting up to now this paper studies a multi period mean variance portfolio selection problem with a stochastic interest rate where the movement of the interest rate is governed by the discrete time vasicek model invoking dynamic programming approach and the lagrange duality theory we derive the analytical expressions for both the efficient investment strategy and the efficient mean variance frontier of the model formulation we then extend our model to the situation with an uncontrollable liability

the economics of poverty traps and persistent poverty an asset based approach abstract longitudinal data on household living standards open the way to a deeper analysis of the nature and extent of poverty while a number of studies have exploited this type of data to distinguish transitory from more chronic forms of income or expenditure poverty this paper develops an asset based approach to poverty analysis that makes it possible to distinguish deep rooted persistent structural poverty from poverty that passes naturally with time due to systemic growth processes drawing on the economic theory of poverty traps and bifurcated accumulation strategies this paper briefly discusses some feasible estimation strategies for empirically identifying poverty traps and long term persistent structural poverty as well as relevant extensions of the popular foster greer thorbecke class of poverty measures the paper closes with reflections on how asset based poverty can be used to underwrite the design of persistent poverty reduction strategies

the rationale of the mean standard deviation analysis skewness preference and the demand for money publisher summary this chapter discusses the rationale of the mean standard deviation analysis skewness preference and the demand for money in january 1969 issue of the review of economic studies karl borch and martin feldstein separately criticized the widely used mean variance analysis of portfolio selection borch contended that any system of upward sloping mean standard deviation e s indifference curves can be shown to be inconsistent with the basic axiom of choice under uncertainty he pointed out that one can always pick any two points on an upward sloping indifference curve to represent two bernoulli distributions with probability 1 p of gaining the same amount x in both the cases and probability p of gaining y1 in the case of one distribution and y2 in the case of the second distribution with y2 y1 if the second distribution represents the point to the northeast of the other point then by the dominance axiom the second distribution must be preferred to the first which contradicts the basic meaning of indifference curves feldstein by using a log utility function and a lognormal distribution for investment outcome showed that e s indifference curves for a risk averter need not be convex downwards though upward sloping they would change from convex to concave once the standard deviation of the outcome exceeds the mean multiplied by on the face of it this seems to suggest that risk aversion might decrease as risk is increased beyond a certain extent

continuous time mean variance asset allocation a time consistent strategy abstract we develop a numerical scheme for determining the optimal asset allocation strategy for time consistent continuous time mean variance optimization any type of constraint can be applied to the investment policy the optimal policies for time consistent and pre commitment strategies are compared when realistic constraints are applied the efficient frontiers for the pre commitment and time consistent strategies are similar but the optimal investment strategies are quite different

exploring double side selling in cooperatives case study of four coffee cooperatives in rwanda apart from the difficulty to attract new members leakage of sales outside the cooperative is a major challenge for the coffee cooperatives in rwanda local independent traders still constitute a major market for coffee producers yet cooperatives also accept the produce from non members and pay them the same price our objective in this paper is to analyse the importance of this phenomenon of double side selling we collected data from a sample of 170 coffee farmers we use a probit model to analyse characteristics linked to cooperative membership and to study double side selling we describe the trade relationships between farmers and the cooperative on the one hand and between farmers and traders on the other by the attributes of transaction costs involved in the trade of coffee membership characteristics include easy access to labour land tenure risk aversion and mutual trust between farmers and cooperatives management preference to sell to traders can be explained by the trust farmers seem to have in them after the repeated transactions in credit and basic consumption items and by long term relationships in the community

dynamic mean variance portfolio selection with borrowing constraint abstract this paper derives explicit closed form solutions for the efficient frontier and optimal investment strategy for the dynamic mean variance portfolio selection problem under the constraint of a higher borrowing rate the method used is the hamilton jacobi bellman hjb equation in a stochastic piecewise linear quadratic plq control framework the results are illustrated on an example

why capital suppliers usually hire workers what we know and what we need to know abstract a fundamental question for economics is why large firms in market economies usually assign control rights to capital suppliers rather than labor suppliers a diverse collection of answers can be found in the literature but unfortunately little theoretical consensus has emerged and few attempts have been made to resolve this issue through systematic empirical investigation this paper reviews a number of different hypotheses clustering around work incentives the financing of firms and collective choice we identify the strengths and weaknesses of each approach filling in theoretical gaps where necessary and conclude with some suggestions for empirical research

a multi period fuzzy portfolio optimization model with minimum transaction lots abstract in this paper we consider a multi period fuzzy portfolio optimization problem with minimum transaction lots based on possibility theory we formulate a mean semivariance portfolio selection model with the objectives of maximizing the terminal wealth and minimizing the cumulative risk over the whole investment horizon in the proposed model we take the return risk transaction costs diversification degree cardinality constraint and minimum transaction lots into consideration to reflect investor s aspiration levels for the two objectives a fuzzy decision technique is employed to transform the proposed model into a single objective mixed integer nonlinear programming problem then we design a genetic algorithm for solution finally we give an empirical application in chinese stock markets to demonstrate the idea of our model and the effectiveness of the designed algorithm

union wage differentials product market influences and the division of rents this paper examines the extent to which product market conditions limit the ability of trade unions to establish wage differentials over nonunion pay the mean union pay differential is estimated to be of the order of 8 percent to 10 percent in establishments with some degree of product market power but zero in establishments facing competitive product market conditions when competitive conditions are faced a preentry closed shop and high union coverage of the industry are both required it is estimated that only 5 percent of the establishments in which there are significant differentials over nonunion pay face generally competitive product market conditions copyright 1990 by royal economic society

do labour managed firms benefit from agglomeration panel data on the entry of labour managed firms in the basque country are used to test for the presence of agglomeration externalities a variety of controls are employed to deal with the identification problem that confronts any attempt to measure such effects consistent with theoretical arguments we find evidence of positive non industry specific externalities among labour managed firms our results do not rule out the additional presence of industry specific externalities among such firms but do indicate an absence of externalities flowing from capitalist to labour managed firms

modernizing peasant agriculture lessons from el palmar colombia abstract this paper examines the short run and anticipated long run output and income results of the modernization of production in a colombian peasant community el palmar the study finds that in the short run there were increases in output and in producer income as well as increases in local employment and trade opportunities which benefited land poor households however the incidence of extreme poverty in the community was still high after 10 years of modernization the gains from modernization had been limited by the failure of the projects to achieve stable low risk increases in the productivity of peasant resources and many producers had pulled back from adoption of full technological packages in favor of selective and limited adoption the lessons from the community of el palmar are applied to an assessment of the peasant modernization program of the colombian government where it is shown that the problems encountered in el palmar are reflective of problems with the colombian modernization strategy in general the conclusion drawn is that the income gains that can be achieved from the modernization of peasant production in the context of peasant land scarcity and the poor market conditions for traditional peasant products are limited

information asymmetry and international strategic alliances abstract this paper examines how information asymmetry affects cross border strategic alliance formation by us firms over the period 2000 2008 we construct a measure information costs based on both geographical distance and the proportion of worldwide gdp the partner s home country represents consistent with our expectations we find an inverse association between information costs and cross border strategic alliances when considering the proportion of alliances formed with publicly quoted overseas partners we find this is unaffected by the level of information costs but rather the level of stock market development tax rate and general economic conditions information costs are however significantly negatively related to alliances with overseas private organizations our results offer clear support for the on going importance of information asymmetry in corporate decision making

the latte revolution regulation markets and consumption in the global coffee chain abstract coffee is a truly global commodity and a major foreign exchange earner in many developing countries the global coffee chain has changed dramatically as a result of deregulation new consumption patterns and evolving corporate strategies from a balanced contest between producing and consuming countries within the politics of international coffee agreements power relations shifted to the advantage of transnational corporations a relatively stable institutional environment where proportions of generated income were fairly distributed between producing and consuming countries turned into one that is more informal unstable and unequal through the lenses of global commodity chain analysis this paper examines how these transformations affect developing countries and what policy instruments are available to address the emerging imbalances

effect of certified organic production systems on poverty among smallholder farmers empirical evidence from kenya summary this study evaluates the effect of certified organic production on poverty in smallholder production systems data was collected from cross sectional survey of local market oriented peri urban vegetable and rural honey producers in kenya poverty was measured using the multidimensional poverty methodology and endogenous switching probit model used to assess the effect of certified organic production on multidimensional poverty findings were that certified producers were less likely to be multidimensional poor compared to their counterfactual case of not participating in organic certification schemes additionally noncertified producers would be less likely to be poor if they were to participate in organic certification production

fair trade organic coffee production in nicaragua sustainable development or a poverty trap abstract this article assesses the impact of fair trade organic coffee production on the well being of small scale farmers in nicaragua studying the results of organic management is crucial for evaluating the advantages of fair trade because approximately half of all fair trade coffee is also organically certified a wide range of farmers representatives of cooperatives and export companies in nicaragua were interviewed during seven months of field work between 2005 and 2008 fair trade organic production raises farmer income when low intensity organic farming is an alternative to low intensity conventional farming however low intensity farming produces very little coffee in the case of the most marginalized farmers keeping these farmers in poverty with higher intensities of management the economic advantages of fair trade organic production largely depend on prices in the mainstream market

fair trade organic coffee rural livelihoods and the agrarian question southern mexican coffee families in transition summary we use a random sample of coffee producing households in southern mexico to compare opportunities associated with government subsidies and migration to the role of fair trade organic coffee in household livelihoods although land and labor returns among fair trade organic coffee growers are higher than for conventional growers differences in yields are more important than price premiums moreover investment in education and labor opportunities outside coffee dominate those in fair trade organic coffee the results highlight the value of an integrated approach to the agrarian question that improves productivity and prices and supports other pathways for improving incomes

converting asset holdings into livelihood an empirical study on the role of household agency in south africa summary this paper analyzes the complexities of converting assets into livelihood and the role that agency constraints play drawing inspiration from the capabilities approach and using household data from south africa linkages between assets and agency are identified by decomposing asset endowments impact on future livelihood by employing a method of path analysis akin to early heritability of traits studies theoretical asset based studies of chronic poverty are bridged with capabilities literatures the interaction between assets and agency is shown to be as important as asset to asset complementarities the results have wide ranging policy implications

the effect of specialty coffee certification on household livelihood strategies and specialisation abstract farm certification is rapidly becoming a sine qua non for access to specialty coffee markets at the centre of these changes are smallholder coffee producers responsible for 80 of global coffee production although rural households are known to depend on more than agricultural production alone the literature on specialty coffee and certification has rather narrowly focused on coffee income and production in this study broader impacts are explicitly taken into account household income was decomposed into categories corresponding to specific income generating activities and coffee income was broken down into price yield and area effects results show that coffee certification encourages farmers to specialise in coffee production increasing coffee income but not total household income at least not in the short run the time and effort required to attain the higher coffee income offered by certified production means farmers have to give up other activities this substitution effect cancels out the income effect such that there is no increase in total household income the lack of an effect on total household income suggests the return to the additional labour effort required for certified coffee production is not higher than in other activities questioning the benefits of certification for small scale producers

two moment decision models and expected utility maximization two moment decision models are consistent with expected utility maximization only if the choice set or the agent s preferences are restricted this paper identifies a restriction which is sufficient to ensure this consistency and confirms that it holds in many economic models the implications for economic analysis are then derived two different approaches to representing an agent s preferences over strategies yielding random payoffs are in wide use under the mean standard deviation ms approach the agent is assumed to rank the alternatives according to the value of some function defined over the first two moments of the random payoff while the expected utility eu criterion assumes that the expected value of some utility function defined over payoffs is used instead the fact that there are these two competing approaches has generated a considerable literature some authors are concerned with the advantages and disadvantages of each while others deal with conditions under which the potentially different approaches would yield the same results or at least approximately so space does not

mean variance model for portfolio optimization problem in the simultaneous presence of random and uncertain returns the determination of security returns will be associated with the validity of the corresponding portfolio selection models the complexity of real financial market inevitably leads to diversity of types of security returns for example they are considered as random variables when available data are enough or they are considered as uncertain variables when lack of data this paper is devoted to solving such a hybrid portfolio selection problem in the simultaneous presence of random and uncertain returns the variances of portfolio returns are first given and proved based on uncertainty theory then the corresponding mean variance models are introduced and the analytical solutions are obtained in the case with no more than two newly listed securities in the general case the proposed models can be effectively solved by matlab and a numerical experiment is illustrated

fuzzy multi period portfolio selection with different investment horizons abstract this paper considers a fuzzy multi period portfolio selection problem with v shaped transaction cost compared with the traditional studies assuming that assets have the same investment horizon we handle the practical but complicated situation in which assets have different investment horizons within the framework of credibility theory a mean variance model is formulated with the objective of maximizing the terminal return under the total risk constraint over the whole investment alternatively a variation is given by minimizing the total risk under the terminal return constraint a fuzzy simulation based genetic algorithm fsga is designed and three numerical examples are given to illustrate the effectiveness of the proposed approach

cooperative firms in hard times this paper develops a simple principal agent model to determine the occupational choice of some individuals between entering the labor market as workers and setting up a labor managed firm the start up requires external credit which is provided by a monopolistic lender we show that the occupational choice depends on both the reservation utility of workers and the loan profitability of the bank

effects of fair trade certification on social capital the case of rwandan coffee producers summary fair trade certification may have important social effects on small scale producers but empirical evidence is limited we conducted logistic regressions using data from a 2009 survey of rwandan coffee farmers to estimate the link between fair trade and social capital measured as farmer trust and participation while controlling for various other factors that could influence social capital particularly membership in a cooperative organization the results show a negative association between fair trade and farmer trust in cooperative leadership and a positive association with a perceived higher level of participation of women social capital is linked most significantly to farmers interaction with their neighbors

why is labour managed firm entry so rare an analysis of uk manufacturing data abstract why are there so few labour managed entrants in market economies we address this question by analysing a panel of labour managed entrants into uk manufacturing industries using poisson and negative binomial random effects models our main finding is a significant negative relationship between entry counts and both the capital labour ratio and the variance of profits this is consistent with long standing theoretical arguments that labour managed firms face problems in raising capital and spreading risk

strategic investment and the co existence of labour managed and profit maximising firms the authors examine firm profitability in mixed duopoly equilibrium with one labor managed lm firm and one profit maximizing pm firm and with strategic investment conventional wisdom suggests that firms deviating from profit maximization will suffer forced exit in the long run the authors reverse this conclusion in mixed lm pm duopoly with strategic investment no equilibrium can have both firms making zero profits and pm profitability implies lm profitability but not the converse adverse parameter shifts would cause the pm firm to exit first empirical evidence is consistent with this prediction of robust market survivability of lm firms

the development of private fresh produce safety standards implications for developing mediterranean exporting countries integration into global markets offers the potential for more rapid growth and poverty reduction for poorer countries however market barriers within advanced economies to agricultural imports have made it harder for developing countries to take full advantage of this opportunity this article examines the impact of increasing demands for food safety and quality by european food retailers and how the fundamental structure and culture of supplier organisations required by european retail chains are a major entry barrier for developing mediterranean fresh produce exporting countries and for developing countries in general the long term solution for such countries to sustain an international demand for their products lies in structural strategic and procedural initiatives that build up the trust and confidence of importers retailers in the quality and safety assurance mechanisms for their produce

rural poverty in latin america determinants and exit paths abstract while rural poverty in latin america has declined over the last three decades success has been uneven across countries and rural poverty remains huge reduction in the number of rural relative to urban poor has been mainly the outcome of migration not of successful rural development we show that rural incomes are explained by the asset position of households and the characteristics of the context where assets are used given heterogeneity in asset positions and contexts many strategies to escape poverty consequently exist we identify four paths out of poverty exit agricultural pluriactive and assistance successful rural development to promote the agricultural and pluriactive paths requires a wholesale new approach based on regional development decentralization and participation agricultural technology has a role to play in these two strategies in latin america however the bulk of the benefits from technological change has been captured through indirect effects via the price of food employment creation and contributions to aggregate growth

a possibilistic mean semivariance entropy model for multi period portfolio selection with transaction costs abstract this paper deals with a multi period portfolio selection problem with fuzzy returns a possibilistic mean semivariance entropy model for multi period portfolio selection is presented by taking into account four criteria viz return risk transaction cost and diversification degree of portfolio in the proposed model the return level is quantified by the possibilistic mean value of return the risk level is characterized by the lower possibilistic semivariance of return and the diversification degree of portfolio is measured by the originally presented possibilistic entropy furthermore a hybrid intelligent algorithm is designed to obtain the optimal portfolio strategy finally the comparison analysis between the possibilistic entropy model and the proportion entropy model is provided by two numerical examples to illustrate the efficiency of the proposed approaches and the designed algorithm

small firm entry in us manufacturing a cross section empirical analysis examining the entry behavior of small firms is provided in this paper while the authors find that certain traditional market structure characteristics and entry barriers have a strong impact on small firm entry behavior the reliance upon innovative strategy by small firms also explains a significant amount of the variation in the pattern of entry by small firms they conclude that small firm entry is at least partially determined by entry barriers industry specific characteristics facilitating retaliatory conduct by incumbent firms and the reliance upon innovative strategy by small firms copyright 1989 by the london school of economics and political science

portfolio optimization under loss aversion abstract we present an integrated methodological approach for selecting portfolios the proposed methodology is focused on incorporation of investor s preferences in the mean risk framework we propose a risk measure calculated with the downside part of the portfolio return distribution which we argue captures better the practical behavior of the loss averse investor we establish its properties study the link with stochastic dominance criteria point out the relations with conditional value at risk and lower partial moment of first order and give the explicit formula for the case of scenario based portfolio optimization the proposed methodology involves two stages firstly the investment opportunity set efficient frontier is determined and secondly one single preferred efficient portfolio is selected namely the one having the highest expected utility value three classes of utility functions with loss aversion corresponding to three types of investors are considered the empirical study is targeted on assessing the differences between the efficient frontier of the proposed model and the classical mean variance mean cvar and mean lpm1 frontiers we firstly analyze the loss of welfare incurred by using another model instead of the proposed one and measure the corresponding gain loss of utility secondly we assess how much the portfolios really differ in terms of their compositions using a dissimilarity index based on the 1 norm we describe and interpret the optimal solutions obtained and emphasize the role and influence of loss aversion parameters values and of constraints three types of constraints are studied no short selling allowed a certain degree of diversification imposed and short selling allowed

how much more do growers receive for fair trade organic coffee abstract i use a representative sample of coffee growing households in southern mexico to estimate the price premium and gross income gain from participating in fair trade organic markets through grower cooperatives for the 2004 2005 season ft organic growers received an average premium of 12 8 cents per pound yielding a gross income gain of 5 of total household income or about 26 dollars per household member the gain is net of the costs of cooperative participation but not of other costs incurred to become certified and suggests that price premiums alone have a limited potential to increase household returns from growing coffee more broadly speaking the finding raises questions about the persistence of substantial price premiums associated with social or environmental labeling initiatives

notes a reformulation of a mean absolute deviation portfolio optimization model the purpose of this note is to present a reformulation of the model presented by konno and yamazaki 1991 in their paper it was claimed that under the assumption that there is no upper limit on the investment in an asset the number of nonzero assets in the optimal portfolio is at most 2t 2 where t is the number of time periods in the data base used to approximate the parameters of the return distributions of the assets the formulation we present which is shown to be equivalent to that of konno and yamazaki has a bound of t 2 on the number of nonzero assets in the optimal portfolio

portfolio optimization with disutility based risk measure abstract in this paper we propose a quantile based risk measure which is defined using the modified loss distribution according to the decision maker s risk and loss aversion the properties related to different classes of disutility functions are established a portfolio selection model in the mean risk framework is proposed and equivalent formulations of the model generating the same efficient frontier are given the advantages of this approach are investigated using real world data from nyse the differences between the efficient frontier of the proposed model and the classical mean variance and mean cvar are quantified and interpreted extensive experiments show that the efficient portfolios obtained by using the proposed model exhibit lower risk levels and an increased satisfaction compared to the other two mean risk models

a risk return model with risk and return measured as deviations from a target return two attribute risk and return models are very popular in the economics and finance literature for analyzing decisions under uncertainty their popularity stems primarily from the intuitive appeal of the dichotomy into risk and return and from the ease with which the concepts can be diagrammed in two dimensions the most commonly used risk return model is the mean variance model in which risk is measured as the variance and return by the mean of the probability distribution over outcomes the mean variance model has a number of shortcomings which are widely known but of particular concern here are the facts that 1 mean variance dominance is neither necessary nor sufficient for second degree stochastic dominance 2 unless the form of the probability distribution is restricted mean variance is consistent with von neumann morgenstern utility theory only if the utility function is quadratic and 3 as peter fishburn has noted

variance vs downside risk is there really that much difference abstract the popularity of downside risk among investors is growing and mean return downside risk portfolio selection models seem to oppress the familiar mean variance approach the reason for the success of the former models is that they separate return fluctuations into downside risk and upside potential this is especially relevant for asymmetrical return distributions for which mean variance models punish the upside potential in the same fashion as the downside risk the paper focuses on the differences and similarities between using variance or a downside risk measure both from a theoretical and an empirical point of view we first discuss the theoretical properties of different downside risk measures and the corresponding mean downside risk models against common beliefs we show that from the large family of downside risk measures only a few possess better theoretical properties within a return risk framework than the variance on the empirical side we analyze the differences between some us asset allocation portfolios based on variances and downside risk measures among other things we find that the downside risk approach tends to produce on average slightly higher bond allocations than the mean variance approach furthermore we take a closer look at estimation risk viz the effect of sampling error in expected returns and risk measures on portfolio composition on the basis of simulation analyses we find that there are marked differences in the degree of estimation accuracy which calls for further research

estimation risk in portfolio selection the mean variance model versus the mean absolute deviation model konno and yamazaki konno h k yamazaki 1992 mean absolute deviation portfolio optimization model and its applications to tokyo stock market management sci 39 519 531 propose the mean absolute deviation mad model as an alternative to the mean variance mv model they claim it retains all the positive features of the mv model saves the investor computing time and does not require the covariance matrix this paper shows that ignoring the covariance matrix results in greater estimation risk that outweighs the benefits in both models estimation error is more severe in small samples small observations relative to the number of assets and for investors with high risk tolerance the mv model s lower estimation risk is most striking in small samples and for investors with a low risk tolerance

credit rationing or entrepreneurial risk aversion an alternative explanation for the evans and jovanovic finding abstract evans and jovanovic ej evans d jovanovic b 1989 an estimated model of entrepreneurial choice under liquidity constraints journal of political economy 97 4 808 827 claimed that in a credit market with collateral based lending credit rationing occurs if more collateral increases startups adjusting the model to incorporate uncertainty and decreasing absolute risk aversion this relationship can be explained as a risk averter s response to the lowered riskiness of self over wage employment

confronting the coffee crisis can fair trade organic and specialty coffees reduce small scale farmer vulnerability in northern nicaragua summary this paper links changing global coffee markets to opportunities and vulnerabilities for sustaining small scale farmer livelihoods in northern nicaragua changing governance structures corporate concentration oversupply interchangeable commodity grade beans and low farm gate prices characterize the crisis in conventional coffee markets in contrast certified fair trade and organic are two alternative forms of specialty coffee trade and production that may offer opportunities for small scale producers a research team surveyed 228 farmers to measure the impact of sales on organic and fair trade markets the results suggest that participation in organic and fair trade networks reduces farmers livelihood vulnerability 2004 elsevier ltd all rights reserved

an expected regret minimization portfolio selection model abstract fuzzy portfolio selection has been widely studied within the framework of the credibility theory however all existing models provide only concentrated investment solutions which contradicts the risk diversification concept in the classical portfolio selection theory in this paper we propose an expected regret minimization model which minimizes the expected value of the distance between the maximum return and the obtained return associated with each portfolio we prove that our model is advantageous for obtaining distributive investment and reducing investor regret the effectiveness of the model is demonstrated by using an example of a portfolio selection problem comprising ten securities in the shanghai stock exchange 180 index

entry and exit from manufacturing industries symmetry turbulence and simultaneity some empirical evidence from greek manufacturing industries 1982 1988 the interdependence between entry and exit of firms into manufacturing industries is the focus of this research when both entry and exit equations are estimated separately the results support the existence of strong symmetry in their determinants when however entry and exit are estimated within a simultaneous equation framework the empirical evidence does not offer sufficient grounds to support the notion that entry and exit are simultaneously linked instead it seems that they are two contemporaneously related processes which respond in like fashion to the structural characteristics found in particular industries their linked response is also extended to factors unaccounted for by the individual entry and exit formulations and this expresses itself in significant contemporaneous correlation between the entry and exit equation residuals the change in the identities of firms operating implied by the positive correlation between entry and exit may then be attributed to industry turbulent condition

changing asset endowments and smallholder participation in higher value markets evidence from certified coffee producers in nicaragua this paper examines the capacities of smallholders in nicaragua to exploit new linkages to certified coffee markets following the coffee crisis data on livelihood assets were collected from 292 households which were clustered to test how differences in outcomes asset building reflect variations in initial asset endowments the results suggest that most households built particular elements of their asset base and increased their resilience to future shocks however households struggled to make effective use of the gains for intensifying their livelihoods of the least endowed households few made investments in the scale or productivity of coffee and most continued to depend heavily on subsistence production and seasonal off farm income for survival in conclusion improved market access alone even under relatively favorable market conditions and with considerable external support will have uncertain impacts on rural poverty if the underlying constraints on household assets and investments are not addressed concurrently