total factor productivity and the environmental kuznets curve a comment and some intuition abstract chimeli and braden chimeli ariaster b braden john b 2005 total factor productivity and the environmental kuznets curve journal of environmental economics and management 49 366 380 derive a necessary and sufficient condition under which inter country differences in total factor productivity can yield an environmental kuznets curve they argue that their results emphasize the importance of differences in total factor productivity across countries as well as the need for decreasing returns to scale in pollution abating technologies for the existence of an environmental kuznets curve we show that their proposition 1 is equivalent to proposition 2 in lieb lieb christoph m 2002 the environmental kuznets curve and satiation a simple static model environment and development economics 7 429 448 this implies that even in chimeli and braden s model contemporaneous changes in the marginal rate of substitution between environmental quality and consumption on the demand side and the marginal rate of transformation between these goods on the supply side drive the pollution income relationship this is a very general condition that does not rely on either differences in total factor productivity or decreasing returns to scale in abatement and which is widely applicable

ipo underpricing and flotation methods in taiwan a stochastic frontier approach adopting stochastic frontier analysis this article studies the pricing model and underpricing phenomenon of the initial public offerings ipos in taiwan and further elucidates the potential impact of offering mechanisms on underpricing the sampling period is from 1996 to 2003 in which 647 ipos are selected empirical results suggest that issuing firms with greater earning potentials less risk or less asymmetric information have lower underpricing furthermore the variables included to explain underpricing are mostly significant especially the proxy variable for flotation method observed mean ipo underpricing is 20 59 in the sample period compared to 17 12 for the subgroup using the auction method this statistically significant difference implies that the introduction of the auction method can help reduce ipo underpricing

rural urban poverty differences in transition countries summary this paper uses new poverty data based on household level surveys to analyze changes in rural poverty and rural urban poverty differences in 23 transition countries of central and eastern europe and the former soviet union the paper presents a series of hypotheses to explain differences across countries and changes over time

the empirical analysis of the determinants for environmental technological change a research agenda abstract technological change is usually considered a necessary albeit not sufficient condition for a transition to sustainability however the empirical analysis of the determinants to environmental technological change has not received too much attention in the environmental ecological economics literature and many open questions remain in this context based on a careful review of the literature this paper argues that further analysis should address several issues at different levels i e regarding the conceptual framework the thematic scope of the studies some methodological issues and other aspects related to the environmental policy variable first an integrated conceptual framework which takes into account the interplay between relevant variables influencing environmental technological change i e factors internal and external to the firm and characteristics of the environmental technologies and all the stages of this process with a greater emphasis on the invention stage should be developed other aspects should then be tackled including a focus on several themes i e a greater attention to cross sectoral technologies the barriers to different types of environmental technologies the international dimension of environmental technological change and environmental technological change in small and medium size enterprises methodological issues combination of case studies and econometric modelling and several issues related to the environmental policy variable

x efficiency and economies of scale in pension fund administration and investment pension funds operating costs impair pension benefits so it is crucial for pension funds to operate at the lowest cost possible in practice we observe substantial differences in costs per member for dutch pension funds both across and within pension fund size classes this article presents new estimates of scale economies of pension funds and is the first that also measures pension fund x inefficiency we use a unique supervisory data set which distinguishes between administrative and investment costs and apply various approaches and models our estimates show large economies of scale for pension fund administrations but modest diseconomies of scale for investment activities we also found that many pension funds have substantial x inefficiencies for both administrative and investment activities the two kinds of inefficiency differ across types of pension funds therefore most pension funds should be able to improve their cost performance and hence increase pension benefits

the environmental kuznets curve and flow versus stock pollution the neglect of future damages in this paper we offer a possible explanation for the empirical finding that the pollution income relationship pir for flow pollutants is an environmental kuznets curve ekc i e inverted u shaped but that the pir for stock pollutants is monotonically rising we analyse an overlapping generations model with two pollutants the flow pollutant causes immediate damages but the stock pollutant harms the environment only in the future hence a succession of myopic governments lets stock pollution grow with income in contrast the flow pollutant follows an ekc whose downturn might be caused by the neglect of future damages and by ever rising stock pollution without the stock pollutant the pir for the flow pollutant can increase monotonically we also show that the turning point of the ekc for the flow pollutant lies at lower levels of income and of flow pollution if stock pollution is high and harmful this casts doubts on most empirical ekc studies because they assume that the turning point occurs at the same income level in all countries however it is consistent with recent empirical findings that the income level at the turning point of the ekc varies across countries

household production and environmental kuznets curves examining the desirability and feasibility of substitution this paper provides a theoretical explanation for the widely debatedempirical finding of environmental kuznets curves i e u shaped relationships between per capita income and indicators of environmentalquality we present a household production model in which the degradationof environmental quality is a by product of household activities householdscan not directly purchase environmental quality but can reduce degradation by substituting more expensive cleaner inputs to production for less costlydirty inputs if environmental quality is a normal good one expectssubstitution towards the less polluting inputs so that increases in incomewill increase the quality of the environment it is shown that this onlyholds for middle income households poorer households spend all income on dirty inputs when they buy more as income rises the pollution also rises they do not want to substitute as this would reduce consumption ofnon environmental services for environmental amenities that are alreadyabundant thus as income rises from low to middle levels a u shape can result yet an n shape might eventually result as richer households spend all income on clean inputs further substitution possibilities are exhausted thus as income rises again pollution rises and environmental quality falls

a few goodmen surname sharing economist coauthors we explore the phenomenon of coauthorship by economists who share a surname prior research has included at most three economist coauthors who share a surname ours is the first paper to have four economist coauthors who share a surname as well as the first where such coauthors are unrelated by marriage blood or current campus jel y9

does s kuznets s belief question the environmental kuznets curves this paper examines the link between pollution and income the main purpose is to assess whether the introduction of income inequality in a environmental kuznets curve ekc analysis can give new insights into the relationship between pollution and economic growth the ekc hypothesis proposes that there is an inverted u shape relation between environmental degradation and income per capita we question this common result in a simple model where the income inequality evolution is exogenous and where the planner could use only one instrument for a set of parameter values we find for example a two hump curve jel classification d3 h4 q2 est ce que le postulat de s kuznets remet en question les courbes environnementales a la kuznets cet article analyse la relation entre pollution et revenu l objectif de cet article est de montrer comment la prise en compte de l inegalite des revenus dans une analyse de la courbe environnementale de kuznets peut modifier la relation entre pollution et croissance l hypothese de la courbe environnementale de kuznets revient a supposer l existence d une forme en u inverse entre la degradation de l environnement et le revenu par tete cet article remet en cause ce resultat a l aide d un modele simple dans lequel l inegalite du revenu evolue de maniere exogene et ou le planificateur ne peut utiliser qu un seul instrument pour certaines valeurs des parametres du modele nous trouvons que la relation entre la pollution et le revenu suit une courbe a deux bosses

extrinsic versus intrinsic problems of agricultural cooperation anti incentivism in tanzania and china peasant willingness to engage in collective farming and the efficiency of collective farms once established may be preconditioned on local self determination participatory control discriminating work incentives and external manoeuvrability in the absence of such preconditions whether or not there exist economies of scale sufficient to offset effectively minimised incentive problems cannot be determined anti incentivism bureaucratic controls and extractive external environments are identified as factors inhibiting successful collective farming in both tanzania and china explanations of these tendencies in the two countries are sought in their political economies and ideological structures

citations in economics measurement uses and impacts i describe and compare sources of data on citations in economics and the statistics derived from them constructing data sets of the post publication citation histories of articles published in the top five journals in the 1970s and 2000s i examine distributions and life cycles of citations compare citation histories of articles in different subspecialties in economics and present evidence on the history and heterogeneity of those journals impacts and the marginal citation productivity of additional coauthors i use a new data set of the lifetime citation histories of over 1 000 economists from thirty universities to rank economics departments by various measures and demonstrate the importance of intra and interdepartmental heterogeneity in productivity throughout the discussion summarizes earlier work including the impacts of citations on salaries and nonmonetary rewards and how citations reflect judgments about research quality in economics and the importance of economic ideas

accumulation of assets in farms covered by the fadn farm accountancy system in poland the economic and eco efficiency context the primary objective of the article is to identify the accumulation processes in farms in poland based on the economic size as well as the context of eco efficiency from the perspective of environmental sustainable value in addition the importance of subsidies in generating accumulation was specified and the context of eco efficiency was taken into account analysis of the environmental context was carried out with the use of the assessment of subsidies for public goods and return to cost ratio rtc based on the concept of sustainable value sv cross analysis has shown that with the transition to groups of farms with an increasing economic size the situation was more favourable from the perspective of the accumulation rate and its level per 1 ha subsidies play a significant role in shaping accumulation it was observed that the higher rate of accumulation associated with the transition to groups of farms with greater economic strength is accompanied by an increase in eco efficiency through the prism of the rtc indicator larger but not the largest farms are more efficient in using the transformation of environmental inputs into production output which does not mean that they exert an absolutely lower environmental pressure

some models for estimating technical and scale inefficiencies in data envelopment analysis in management contexts mathematical programming is usually used to evaluate a collection of possible alternative courses of action en route to selecting one which is best in this capacity mathematical programming serves as a planning aid to management data envelopment analysis reverses this role and employs mathematical programming to obtain ex post facto evaluations of the relative efficiency of management accomplishments however they may have been planned or executed mathematical programming is thereby extended for use as a tool for control and evaluation of past accomplishments as well as a tool to aid in planning future activities the ccr ratio form introduced by charnes cooper and rhodes as part of their data envelopment analysis approach comprehends both technical and scale inefficiencies via the optimal value of the ratio form as obtained directly from the data without requiring a priori specification of weights and or explicit delineation of assumed functional forms of relations between inputs and outputs a separation into technical and scale efficiencies is accomplished by the methods developed in this paper without altering the latter conditions for use of dea directly on observational data technical inefficiencies are identified with failures to achieve best possible output levels and or usage of excessive amounts of inputs methods for identifying and correcting the magnitudes of these inefficiencies as supplied in prior work are illustrated in the present paper a new separate variable is introduced which makes it possible to determine whether operations were conducted in regions of increasing constant or decreasing returns to scale in multiple input and multiple output situations the results are discussed and related not only to classical single output economics but also to more modern versions of economics which are identified with contestable market theories

resource allocation and use under collective rights and labour management in peruvian coastal agriculture a critical issue in the evaluation of labour management as a development policy is its impact on production in an effort to contribute to that evaluation and to the economics of labour management this study analyses production data collected from cooperative firms established by the peruvian agrarian reform the data present an unusual opportunity for careful microeconomic analysis of the reform itself as well as an opportunity to confront and refine existing propositions about the effects of the collective property rights of labour management on production property rights may affect production because of their effort on incentives for conventional resource allocation decisions they may also affect intrafirm principal agent decisions which determine the intensity with which given resources are utilised beginning with ward s i 958 paper a number of theoretical studies have compared labour managed and capitalist resource allocation and an approximate consensus has emerged about conditions under which differences occur in this study measures of the allocative behaviour of peruvian firms are estimated and compared with the theoretically expected behaviour of both capitalist and peasant agricultural producers the impact of collective ownership on the intensity of resource utilisation i e technical efficiency of the observable production function arouses greater theoretical dispute than the resource allocation question a collective assignment of property rights may weaken supervisory authority which can control free rider externality problems within the production process on the other hand participation of labour in management may foster cooperative attitudes and other social control devices which can fulfill the same functions as hierarchical supervision existing literature offers the competing hypotheses that labour management leads either to a breakdown in intrafirm coordination and the observable technical efficiency of production as jensen and meckling i 979 claim or to an improvement as vanek i 969 claims the results of the present paper do not unequivocably support either view instead they portray a diversity in labour managed production performance and suggest the importance of policy and institutional factors which condition the impact of labour management on production the results also provide a

livelihoods and farm efficiency in rural georgia this study contributes to the literature on the role of livelihood strategies in rural growth and poverty reduction it distinguishes between livelihood diversity strategies that contribute to sustainable growth in household incomes and those that mainly have a coping function it suggests that typically the contribution of livelihood diversity to growing household income is through relaxing dependence on credit for access to capital in this scenario livelihood diversity would lead to higher technical efficiency in agriculture via investment and thereby to higher household incomes survey data from georgia are introduced and used to test these hypotheses using a bayesian stochastic frontier approach the findings are relevant to defining more clearly the scope and aims of policies to stimulate the rural non farm economy in developing and transition countries

transition and integration in europe implications for agricultural and food markets policy and trade agreements several central and eastern european countries are on their way to becoming members of the european union agriculture and agricultural policy is an important issue in eu enlargement this paper reviews the changes that have occurred in the agricultural and food sector of the ceecs and draws implications for the impact of eu enlargement on agri food markets and policy first those countries which have reformed most rapidly and most thoroughly are now doing best and their reform efforts have resulted in significant recovery and efficiency improvements second the impact of eastern enlargement will be less dramatic than initially feared although some uncertainty remains the possibility that the accession of the ceecs into the cap will cause a conflict with wto commitments has been reduced but cannot be excluded for some specific commodities depending on the ceec supply evolution however the likelihood of a wto conflict and the impact on the cap will depend more on the outcome of the negotiations in the wto millennium round than on enlargement similarly the impact of enlargement on the eu budget depends mostly on the political decision on the allocation of direct payments to ceec farmers and or of the extent of structural funds for ceecs

the impact of the 1999 cap reforms on the efficiency of the cop sector in spain the cereal oilseeds and protein crop sector cop occupies a prominent position within the european union s agricultural sector within spain the cop sector accounts for almost a third of total agricultural guidance and guarantee fund expenses and half of the utilized agricultural area uaa the cop sector is not only relevant because of its physical and economic magnitude but also because of the political attention it receives the common agricultural policy cap reforms that occurred during the 1990s paid special attention to this sector this article aims to determine the impacts of agenda 2000 on a sample of spanish cop farmers production decisions by using an output oriented stochastic distance function the distance function allows for an assessment of the reform motivated changes on total output input used input composition and crop mix it also permits an assessment of the impacts of the reform on farms technical efficiency results show that the reform has shifted the production frontier inward and changed output composition in favor of voluntary set aside land with respect to input composition agenda 2000 induced a decrease in land fertilizers pesticides and other inputs in favor of labor in addition agenda 2000 has had a negative impact on technical efficiency

bias and precision in the dea two stage method in data envelopment analysis dea the two stage method is a popular procedure for accounting for exogenous influences on efficiency with the conventional two stage method a dea is first conducted using only traditional endogenous inputs and outputs then the first stage dea scores are regressed on the environmental contextual exogenous inputs of interest the regression outcomes are used to identify exogenous inputs that influence the first stage dea scores to a statistically significant degree and to adjust dea scores to account for these influences herein it is demonstrated empirically that the conventional method exhibits substantial bias and low precision with the degree of bias and precision affected by input variance and correlation a reverse two stage procedure that yields estimates without the bias and precision problems that compromise the validity of the conventional method s estimates is suggested

on a clear day you might see an environmental kuznets curve we shed some new light on the environmental kuznets curve ekc and show how it can be viewed as a particular form of equilibrium relationship where technology and preference parameters determine the shape of the curve in contrast to most of the literature on the ekc we estimate a theoretically consistent model on long run data swedish sulfur emission covering the period 1900 2002 furthermore we test and date structural change the model suggests four regimes 1900 1918 1919 1933 1934 1967 and 1968 2002 generating four rather different patterns for pollution over time the policy conclusions are consonant with pearce s general view about the ekc there is no theoretical presumption that it has an inverted u shape nor should any country try to grow out of the environmental problems without analyzing the benefits and costs of so doing

on nonparametric supply response analysis in this paper we explore the usefulness of nonparametric methods in the investigation of production behavior and the estimation of price elasticities of output supply and input demand functions the approach can handle the situation where some data points are not consistent with production theory the method is illustrated by estimating supply demand elasticities of outputs and inputs in u s agriculture

a reexamination of the role of income for the trade and environment debate recent work on the relationship between international trade and the environment has found small but negative effects of increased openness on measures of pollution for the average country on a panel of 128 countries it is shown that like previous studies the trade intensity effect is negative and significant for the average country for emissions of four localized pollutants so2 nox co and vocs however trade intensity effects are not uniform across countries of different income levels in fact a strong non monotonicity exists in trade intensity elasticities it is found that countries with relative world incomes less than 0 5 or greater than 2 5 tend to have positive trade intensity elasticities while countries with relative world incomes between 0 5 and 2 5 tend to have negative trade intensity elasticities the results imply that both factor abundance and pollution haven effects may be at work but that the dominance of one effect over the other depends on a country s level of development

trade openness and environmental quality international evidence we examine the relationship between trade openness and the environment in a cross country panel using the emission of particulate matter pm10 as the basic indicator of environmental quality the panel cointegration test results show a long run relationship between particulate matter emissions trade openness and economic growth we find that increased trade openness leads to environmental degradation for the global sample however the results differ according to the income of countries trade openness has a benign effect on the environment in high income countries but a harmful effect in middle and low income countries these results are generally robust to different measures of trade openness and environmental quality interestingly and significantly the results are consistent with the popular notion that rich countries dump their pollution on poor countries finally we find evidence of a feedback effect between trade openness and particulate matter emissions for the global sample as well as different income groups of countries

efficiency analysis of german electricity distribution utilities non parametric and parametric tests this study applies non parametric and parametric tests to assess the efficiency of electricity distribution companies in germany traditional issues in electricity sector benchmarking are addressed such as the role of scale effects and optimal utility size as well as new evidence specific to the situation in germany labour capital and peak load capacity are used as inputs and units sold and the number of customers as output the data cover 307 out of 553 german electricity distribution utilities a data envelopment analysis dea is applied with constant returns to scale crs as the main productivity analysis technique whereas stochastic frontier analysis sfa with distance function is the verification method the results suggest that returns to scale play but a minor role only very small utilities have a significant cost advantage low customer density is found to affect the efficiency score significantly in particular in the lower third of all observations surprisingly east german utiliti

nonhomothetic growth models for the environmental kuznets curve we show the role of the elasticity of substitution between general consumption and the environment in environmental degradation specifically our numerical experiments demonstrate for a wide range of models exponential utility generates the environmental kuznets curve without adding any special assumptions with exponential utility the elasticity of substitution and hence the substitution effect between consumption and the environment are both decreasing in income hence when income is low society the government readily gives up environmental quality in return for more consumption but it does not want to substitute consumption for the environment anymore once it becomes wealthy enough

spatial allocation and the shadow pricing of product characteristics abstract the paper considers an industry transforming primary commodities farm products into processed commodities food products it focuses on the allocation of embedded characteristics carbohydrate protein etc both across space and among commodities the approach generates a spatial competitive market equilibrium of production consumption transformation and trade for both primary and processed commodities along with the spatial distribution of shadow prices for the product characteristics the model provides a basis for analyzing the allocation and pricing of agricultural products food products and characteristics in spatial markets the empirical usefulness of the model is illustrated in the context of regional resource allocation in the u s dairy sector

a consumption based theory of the environmental kuznets curve abstract most theories about the inverted u relationship between pollution and income termed the environmental kuznets curve ekc are production side theories emphasizing pollution and abatement technologies production side theories are implicitly based on the assumption of low factor mobility and the absence of pollution as a variable in the utility function both assumptions are called into question by the empirical evidence of ekcs for i pollutants that are long lived and not easily shiftable and ii regional cross sections with free labor mobility hazardous waste sites are a prime example this paper develops a stylized model of the ekc based on perfect mobility of households and labor it represents the first attempt at developing a consumption side model of the ekc

farm strategy self selection and productivity can small farming groups offer production benefits to farmers in post socialist romania abstract this paper addresses two questions why are romanian farmers continuing to place land in cooperative forms of farming when theory suggests that private farming is more productive and are there efficiency gains to be had from cooperative farming endeavors results from an econometric selection model suggest that smaller endogenously developed farming cooperatives such as family societies provide benefits over private farming strategies under certain conditions this paper questions the wholesale rejection of cooperation around production and challenges policy to move away from the typically dichotomized presentation of agrarian structure as being a trade off between private small scale farming and large scale collective farming

too small to be beautiful the farm size and productivity relationship in bangladesh this paper examines the agricultural productivity farm size relationship in the context of bangladesh features of bangladesh s agriculture help overcome several limitations in testing the inverse farm size productivity relationship in other developing country settings a stochastic production frontier model is applied using data from three rounds of a household panel survey to estimate simultaneously the production frontier and the technical inefficiency functions the correlated random effects approach is used to control for unobserved heterogeneous household effects methodologically the results suggest that the stochastic production frontier models that ignore the inefficiency function are likely mis specified and may result in misleading conclusions on the farm size productivity relationship empirically the findings confirm that the farm size and productivity relationship is negative but with the inverse relationship diminishing over time total factor productivity growth driven by technical change is found to have been robust across the sample across farm size groups the relatively larger farmers experienced faster technical change which helped them to catch up and narrow the productivity gap with the smaller farmers

the environmental kuznets curve ekc theory part a concept causes and the co2 emissions case abstract the main purpose of this study is to capture the main features of the environmental kuznets curve ekc concept according to the ekc theory the process of economic growth is expected eventually to limit the environmental degradation created in the early stages of development the ekc concept leads many researchers from the early 1990s to assume that each economy should focus on its growth and any environmental problems will be eventually eliminated by the process of economic growth several studies attempt to test empirically the ekc hypothesis using data on many countries and examining various types of environmental degradation while other studies examine the underlying factors that may drive such a relationship this article reviews the evolution of the ekc concept and the possible causes of an ekc pattern like the distribution of income the international trade pollution haven hypothesis structural changes technical progress and improvements in energy efficiency institutions and governance and consumer preferences as co2 emissions are a pollutant with global effects several studies deal with the possible ekc pattern for co2 emissions and these studies are discussed separately the various critiques on the ekc concept are reviewed in the second article of this work

first author conditions evidence from finance journal coauthorship we study the trend and the author name ordering rule in finance publication using the publication records of 21 core finance journals during the period from 1990 to 2004 we empirically model the underlying factors that affect the alphabetical ordering rule among multi authored finance articles we find that the choice of alphabetical ordering is based on the quality of the article institutional heterogeneity team size and cultural factors the central argument rests upon the need to signal and the importance of signalling within the context of bargaining behaviour among coauthors the probability of choosing alphabetical name ordering rule is associated with high article quality higher ranked institutions smaller research team and the presence of european authors

global land investments in the bio economy evidence and policy implications for countries dependent on agriculture the recent wave of investor interest in farmland could in principle help set in motion a virtuous cycle of economic growth and poverty reduction a large literature documenting failure of such investments documents the risks involved to appreciate associated opportunities and challenges we review past experience quantify country level potential for area expansion versus intensification and identify determinants of countries attractiveness for investors in the initial stages of the land rush the fact that weak land governance seems to increase rather than reduce land demand justifies an emphasis on improving institutions transparency and accountability while at the same time providing concrete suggestions for policy and research

how do journal quality co authorship and author order affect agricultural economists salaries utilizing an original data set containing annual salaries and peer reviewed publication histories for 326 faculty members from top ranked ph d granting programs we examine the labor market for academic agricultural economists the results suggest that higher quality publications have a greater impact on annual earnings that sole authored articles have a higher return than multi authored articles and that no wage premium exists for being the lead author of a non alphabetic article

collaboration incentives endogenous selection into single and coauthorships by surname initial in economics and management many prior studies suggest that default alphabetical ordering of coauthors in economicsconfers disproportionate professional advantages on those with an early surname initialbecause of the greater prominence it gives to the first author however these studies do notconsider that authors select into coauthorships according to the incentives identified wedevelop a model of endogenous selection into single and coauthorships around the principlethat no one wants to be second author when they expect to provide the larger contribution i e are of higher quality we test it with authorship data from economics with man agement which does not use default alphabetical ordering as a benchmark we predict foreconomics that lower quality authors with an early surname initial would be less desirablecoauthors whereas higher quality authors with a late initial would have a lower desire tocoauthor most desired are early initial authors of high quality who are therefore advan taged in forming high quality collaborations the combined effect predicts citation rankincreases with surname initial for single authored papers and decreases for coauthored we find both effects for economics when compared to management and absolutely ourfindings indicate that part of the advantage enjoyed by early surname initial authors in eco nomics could be due to the higher ability among them having more incentive compatiblecollaborators rather than merely to greater prominence

the impact of china s economic reforms on agricultural productivity growth this paper presents a method for assessing the relative importance of price increases and strengthened individual incentives due to the introduction of the responsibility system for the post 1978 increase in china s agricultural productivity data on post 1978 chinese agricultural performance suggest that a little over three quarters of the measured productivity increase is due to payment system changes and the remainder to price increases we also use our method to calculate incentive indices giving an estimate of the fraction of their marginal product that peasants received under the pre 1978 regime

technical efficiency in developing country agriculture a meta analysis abstract a meta analysis is performed to review empirical estimates of technical efficiency te in developing country agriculture the objective of the study is to contribute to a better understanding of the factors that influence estimates of mean te a data set of 51 observations of te from 32 studies is used in order to test if specific characteristics of the data and econometric specifications account for systematic differences in the efficiency estimates results using the two limit tobit procedure indicate that factors such as primal versus dual number of fixed inputs and number of variable inputs increase average te estimates on the other hand using the cobb douglas functional form and cross sectional data yields a lower level of te other factors including the number of variables in the model crop type stochastic versus deterministic frontiers and sample size do not seem to significantly affect estimates of te across studies

production organization and efficiency during transition an empirical analysis of east german agriculture enterprise restructuring is expected to improve efficiency in transition economies with data from former east germany we compare the efficiency of family farms and partnerships with large scale successor organizations of the collective and state farms lsos using parametric and nonparametric techniques we show that lsos display lower technical efficiency than do family farms and partnerships but that this difference is small and declining during transition mainly as a result of structural changes in agriculture family farms are not as scale efficient as partnerships and lsos and partnerships are superior to all other organizational forms

are there limits to growth a simple theoretical model of pollution is developed that generates an inverted u shape relationship between per capita income and environmental quality this model is then used to study long run growth the same inverted u shape is shown to appear in time series and the prospects for sustained growth are shown to hinge on whether increasingly strict environmental regulation is compatible with a constant rate of return on capital implementation is also studied tax and voucher schemes are shown to have an advantage over direct regulation because they provide the correct incentives for capital accumulation copyright 1998 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

the performance of private and cooperative socialist organization postwar yugoslav agriculture socialist enterprises in yugoslav agriculture show higher levels of productivity than private producers the author examines the sources of these differences with total factor productivity estimates based on sectoral aggregate cobb douglas production functions which permit separation of environmental policy and organizational effects the results support the following conclusions cooperative socialist enterprises are not inherently inefficient and can even outperform private producers both types of producers were responding to their environment and their differential rates of technological change reflect the different constraints they faced and socialist enterprises exhibited technology adoption behavior similar to nonsocialist enterprises elsewhere copyright 1987 by mit press

is private farming more efficient than socialized agriculture this paper examines the technical efficiency of state and private farms in poland for the period 1960 74 we find that the average technical efficiency of the two types of farms does not differ although the dispersion of efficiency levels is greater among state farms than among private ones we do find clear evidence of allocative inefficiency with state farms oversupplied with fertilizer and machinery

aggregating capacity limiting separable inputs 1 introduction in many empirical studies on productivity researchers frequently need to use data on capital goods in their analyses unfortunately capital goods are extremely heterogeneous and data on them are difficult to capture in a single measure there are many different types and vintages of capital goods in the same firm it is very difficult to gather all information on all capital goods in practice capital goods are aggregated into one input named capital recent studies that aggregate capital goods are fare grosskopf and tyteca 1996 who used the installed generating capacity as capital acemoglu and zilibotti 2001 who applied the perpetual inventory method to recover capital from investment mathijs and swinnen 2001 who adopted the deflated book value of fixed assets as capital and taymaz and saatci 1997 who used the depreciation allowance as capital though each method has its merits there may be information loss during the process of aggregating capital goods five possible types of errors during the aggregation process are identified here they are i error of separability there is a close relation between input aggregation and separability when different capital goods are separable from other inputs it is possible to find an aggregate of capital goods without information loss in this case there is no error of separability if capital goods are not separable from other inputs however and we aggregate them then actually we are approximating the production function by a separable function mak 1988 noted that the success of approximating a nonseparable function depends on whether that function is close enough to a separable function thus when the technology is not separable the error of separability occurs when the production function is not close to a separable function the error of separability is even larger ii error of formula suppose the production function is approximated by a separable function then there is a way to aggregate capital goods if the formula we use to aggregate capital goods cannot give us an aggregation consistent with that separable function then we face the error of formula iii error of measuring opportunity costs some measures of capital require information about prices of capital goods in economic theories all prices of inputs are the opportunity costs of using those respective inputs if the prices used do not reflect opportunity costs then this error occurs iv error of the deflator when we need to add up capital goods bought in different periods by using price information we have to deflate the values if an inappropriate deflator is chosen then there is an error of the deflator v error of accounting practices information reported by firms follows bookkeeping rules the value of fixed assets for example may not be the same as the concept of capital in economics thus investment and fixed assets may be biased this problem is larger when firms in different industries or countries are compared whether or not there is the error of separability depends on the structure of the technology it is beyond the control of researchers though we must cope with the error of separability what we can do is to avoid the other four errors in this paper i link the literature on separability with that on maximum capacity in favor of using the output capacity of plants to aggregate heterogeneous capital goods we find that when some inputs are separable in the production function their maximum capacity can be used as an aggregate measure for them this aggregate measure is economically meaningful and empirically tractable this paper is organized as follows section 2 discusses the properties of capacity limiting inputs section 3 relates capacity limiting inputs to separability section 4 comments on some applications of aggregating captial goods section 5 concludes the paper

technical and scale efficiency of crop and livestock farms in poland does specialization matter l efficacite technique et d echelle des exploitations agricoles polonaises est calculee par la methode data envelopment analysis l etude porte sur les differences selon l orientation productive en grandes cultures ou elevage a deux dates de la transition en 1996 et en 2000 l article examine de plus la variabilite statistique des resultats d efficacite ceux ci sont revus a la lumiere des intervalles de confiance construits gr ce au bootstrapping en moyenne les exploitations d elevage ont une efficacite technique et d echelle superieure aux exploitations de grandes cultures l efficacite d echelle est toutefois tres elevee pour les deux orientations l inefficacite technique semble donc due principalement a une inefficacite technique pure c est a dire a une gestion inefficace la faible education des agriculteurs en est une raison majeure en 2000 64 des exploitations d elevage et 86 des exploitations de grandes cultures presentaient des retours d echelle croissants ce resultat suggere des recommandations politiques afin de supprimer les incitations a garder une structure operationnelle fragmentee et de stimuler le marche de la terre il s agit en particulier d ameliorer la legislation concernant la location des terres et de modifier le systeme de retraite agricole

approaching the environmental sustainable value in agriculture how factor endowments foster the eco efficiency abstract small and labor intensive farms guarantee a higher degree of environmental sustainability compared to rich capital intensive farms this paper offers a methodological contribution to the value based sustainability approach consisting in computing a modified indicator of environmental sustainable value using this approach the authors test how factor endowments such as capital land and labor contribute to environmental sustainable value using a long term panel of region representative european union farm accountancy data network farms in 2004 2015 the seminal within between specification was employed to control time variant and time in variant space heterogeneity of european regions the articles main finding is that higher capital endowment and lower labor intensity is beneficial for environmental sustainable value the result that farming with higher labor endowment might be less eco efficient contradicts the commonly known perception of this problem in light of our findings we conclude that the pro investment direction of the common agricultural policy should be followed but one size fit all policy is not working

first author conditions this paper provides a theoretical explanation for the persistent use of alphabetical name ordering on academic papers in economics in a context in which market participants are interested in evaluating the relative individual contribution of authors it is an equilibrium for papers to use alphabetical ordering moreover it is never an equilibrium for authors always to be listed in order of relative contribution in fact we show via an example that the alphabetical name ordering norm may be the unique equilibrium althoug multiple equilibria are also possible finally we charaterize the welfare properties of the noncooperative equilibrium and show it to produce research of lower quality than is optimal and than would be achieved if coauthors were forced to use name ordering to signal relative contribution

rural reforms and agricultural growth in china this paper employs province level panel data to assess the contributions of decollectivization price adjustments and other reforms to china s agricultural growth in the reform period decollectivization is found to improve total factor productivity and to account for about half of the output growth during 1978 84 the adjustment in state procurement prices also contributed positively to output growth its impact came mainly from the responses in input use the effect of other market related reforms on productivity and output growth was very small reasons for slowdown in agricultural growth after 1984 are also analyzed copyright 1992 by american economic association

a within farm efficiency comparison of silvopasture systems with conventional pasture and forestry in northeast argentina agroforestry which has multiple inputs and outputs would benefit from scrutiny of economic efficiency because levels of adoption have not met expectations previous literature estimated the efficiency of agricultural systems using data envelopment analysis however the vast variability between farms makes comparing systems difficult this study uses paired within farm comparisons of silvopasture a combination of planted trees and pasture to conventional cattle ranching and plantation forestry to evaluate the relative technical efficiency silvopasture proves to be more efficient than conventional cattle ranching forestry demonstrated increasing returns to scale cattle raising demonstrated decreasing returns to scale for large scale farmers and silvopasture was intermediate jel d24 o13

performance evaluation of the english premier football league with data envelopment analysis this paper uses data envelopment analysis dea to evaluate the performance of english premier league football clubs from 1998 99 to 2002 03 combining sport and financial variables the paper evaluates how close the clubs are relative to the frontier of best practices analysing how they manage sport as well as financial results managerial implications of the research are devised

market deregulation trade liberalization and productive efficiency in bangladesh agriculture an empirical analysis the impact of trade liberalization and of market deregulation in general on the performance of agriculture remains contentious and empirical issue in the literature following the random coefficient frontier modelling framework this paper attempts to contribute to this debate by computing the farm specific productive efficiency indices in bangladesh agriculture before and after reform it also examines the impact of some farm specific and policy variables on productive efficiency the empirical results show that there are wide variations in productive efficiency across farms and regions and the average efficiency of all regions increased modestly by 8 percentage points from the pre reform to post reform period the efficiency differentials are largely explained by farm size infrastructure households off farm income and the reduction of government anti agricultural bias in relation to trade and domestic policies the implication of these results suggests the need for further policy reform to augment p

technical efficiency and farm size a conditional analysis the relationship between technical efficiency and size might be affected by farm heterogeneity we analyse this relationship conditional on a set of control variables these control variables are chosen using a production model where technical efficiency is introduced as a parameter as a result technical efficiency affects both the input demand and the output supply of a profit maximising producer the empirical application explores these issues using panel data of dairy farms in spain

collectivization and china s agricultural crisis in 1959 1961 the agricultural crisis in china in 1959 61 after the initial success of the collectivization movement resulted in 30 million extra deaths in this paper a game theory hypothesis proposes the main cause of this catastrophe i argue that because of the difficulty in supervising agricultural work the success of an agricultural collective depends on a self enforcing contract in which each one promises to discipline oneself a self enforcing contract however can be sustained only in a repeated game in the fall of 1958 the right to withdraw from a collective was deprived the nature of the collectivization was thus changed from a repeated game to a one time game as a result the self enforcing contract could not be sustained and agricultural productivity collapsed the empirical evidence is consistent with this hypothesis

the economics of agricultural decollectivization in east central europe and the former soviet union 1989 include both the privatization of agricultural production assets and the restructuring of state and collective farms farm restructuring and more specifically the breakup of large scale agricultural production units into individually operated farms a process we define as decollectivization differ considerably for the various ece and fsu countries differences in decollectivization can be observed across countries between regions within a country and over time we argue that these differences are not random this article identifies the factors that affect the decollectivization process and shows how they are consistent with empirically observed differences in agricultural decollectivization in ece and fsu countries the decollectivization process is a consequence of the decision of collective farm members to leave the collective production framework and start up individual farms factors affecting this decision are the expected productivity and profitability of individual farming relative to collective farming and the costs for individuals to leave the collective farm and start up an individual farm these costs are affected by land reform privatization and decollectivization regulations the relative productivity of individual versus collective farming depends on the distribution of collective farmers productivity the prereform average collective farm productivity and the advantages and disadvantages of individual farming compared to collective farming the literature on decollectivization identifies both advantages and disadvantages in collective production some of which would not extend beyond the transition period disadvantages include high transaction costs associated with the monitoring of labor and inefficiencies due to the right of

inventorship and authorship as attribution rights an enquiry into the economics of scientific credit abstract authorship and inventorship are attribution rights upon which individual scientists build their reputation and career social and legal norms concerning their distribution within research teams are currently criticized for failing to inform third parties on individual contributions we examine the case of teams engaged in the double disclosure of their research results through both publications and patents and model the negotiation process taking place between junior or female team members and the senior male ones we suggest that the former may give up inventorship in order to secure authorship even when entitled to the both based on a sample of 680 patent publication pairs related sets of patents and publications we show that very frequently one or more authors of a publication do not appear as inventors of a related patent this is less likely to happen for first and last authors which is in accordance both with our model and the prevailing legal norms on inventorship however the probability of exclusion from inventorship also declines with seniority and increases for women which is compatible with our model only

measuring and explaining scale efficiency with the parametric approach the case of greek tobacco growers estimates of technical and scale inefficiencies of tobacco farms in greece during the period 1991 1995 are obtained by using the parametric approach the degree of technical efficiency was found to be lower than the degree of scale efficiency and thus a greater portion of overall inefficiency is due to producing below the production frontier than to producing at an inefficient scale in addition the vast majority of farms in the sample exhibited suboptimal scale implying that output should be expanded to reach the optimal scale empirical results are provided to determine the impact of various socioeconomic demographic and geoclimatic indicators on technical and scale efficiency

efficiency in social versus private agricultural production the case of yugoslavia this paper extends the work of michael l boyd 1987 by examining the question of efficiency in yugoslavian agricultural production using the stochastic production frontier the authors fin d the private sector produces with higher output efficiency than the social sector next they examine regional efficiency differences the authors findings reinforce earlier analysis of the economic impact of regional development policy pursued in yugoslavia less developed republics appeared unable to utilize efficiently the large volume of investment resources allocated from the more developed republics via the central government copyright 1993 by mit press

success and failure of reform insights from the transition of agriculture this paper analyzes the linkages between the reform strategies in transition countries and economic performance the authors focus on agriculture because of the sharpness of the policy changes fundamental differences among countries and relative simplicity of agricultural relationships the authors document post reform performance in the transition countries of asia and europe the authors show how a pricing reform and subsidy reductions b land rights reform and policies that affect farm restructuring and c the presence institutions that facilitate exchange either markets or market substitutes affect output and productivity the paper ends with general lessons on reforms and transition

economic efficiency in polish peasant farming an international perspective one decade following the market transition in poland the agricultural sector still exhibits low productivity policy makers often describe the sector as fragmented and inefficient to understand why small scale farming in poland is inefficient despite longstanding secure property rights a survey of economic efficiency in southern agriculture was conducted and compared with limited studies of efficiency in poland the most important issues particularly related to farm size and efficiency are price risk uncertainty and low rural development comparative studies across regions with varying institutional arrangements and economic organization are powerful but must be made carefully and critically

transition and agricultural labor reforms have strongly affected agricultural employment in transition countries but in remarkably different ways we present a theoretical model and an empirical analysis to explain differences in labor adjustment during transition we show that the differences are due to a combination of variations in initial conditions and differences in reform policies and effects the removal of price distortions and subsidies caused wage and price adjustments during transition and a reduction in labor demand in agriculture surplus labor outflow from agriculture was further stimulated by the privatization of the farm assets as they improve incentives and remove constraints for optimal factor allocation and structural adjustment the shift to individual farms which was especially strong in labor intensive production systems with low labor productivity in agriculture has reduced the outflow of labor from agriculture by improving farm governance and labor efficiency although this effect was mitigated by losses in scale economies due to disruptions and market imperfections in transition in general labor outflow was considerably lower on individual farms than on corporate farms due to a combination of factors related to human capital access to finance and physical capital in the last section of the article we present a general framework for understanding labor adjustments in transition countries specifically we show that there are several patterns of labor transition in one pattern followed by e g the czech republic and hungary there is initially a strong survival of the restructured large scale corporate farms that have laid off many workers in the second phase of transition gradually the importance of individual farms increases in other countries such as romania the opposite has happened in these countries there is an immediate strong shift to individual farms while labor use increases on average in agriculture after this initial phase the shift to individual farms continues albeit more slowly and labor use in agriculture starts to decline finally our analysis shows that in countries such as russia and ukraine much of the surplus labor is still employed by little reformed former collective and state farms major adjustments await more progress in agricultural and general reforms

total factor productivity and the environmental kuznets curve abstract empirical studies support the environmental kuznets curve hypothesis ekc for some pollutants as income increases pollution increases reaches a peak and eventually decreases while relying mostly on cross sectional data the interpretations assert that the ekc is a by product of economic growth over time in doing so and in neglecting the role of important country specific characteristics these studies overlook potential econometric problems and introduce policy misconceptions differences in total factor productivity tfps account for much of the variation in income across countries with important implications for environmental quality we develop a theoretical model where different tfps produce a cross sectional ekc even if the dynamic path of environmental quality to its steady state in individual countries suggest otherwise the cross sectional ekc depends on diminishing returns to scale in environmental protection on the curvatures of the utility function with respect to consumption and of the environmental protection function and the elasticities of steady state consumption and environmental expenditures with respect to variation in tfps

the boundaries of firms as information barriers when contracts are incomplete the property rights theory of firms suggests that ownership of physical assets provides better outside options which in turn strengthen the owner s incentives to invest in the enterprise this approach is less suitable for human capital firms such as management consulting that lack physical assets this article develops an alternative theory for integration that sheds light on the boundaries of human capital firms in particular when a relationship between parties includes large potential externalities reducing the outside option of each party will be beneficial integration provides this reduction by blurring the contribution of individual parties within the firm and thus lowering their independent market valuation unlike some results in the property rights literature the results here are robust to variations in ex post bargaining solution

land market imperfections and agricultural policy impacts in the new eu member states a partial equilibrium analysis this article analyses how transaction costs and imperfect competition in the land market affect the welfare effects of agricultural subsidies in the new eastern member states of the european union benefits of land subsidies end up with landowners in new eastern member states also with imperfections in the new eastern member states land markets with unequal access to subsidies small tenant farmers may even lose out from the subsidies decoupling of payments shifts policy rents to farmers but constrains productivity enhancing restructuring using reserve entitlements to mitigate this effect reduces the intended benefits on distortions and target efficiency

social efficiency of entry in a vertically related industry we provide a new perspective to the literature on social desirability of entry by showing that if the input supplier has market power social desirability of entry of the final goods producers depends on returns to scale entry in the final goods market can be socially insufficient under constant returns to scale technology but it can be socially excessive under decreasing returns to scale technologies if the cost of entry is low so that the final goods market is sufficiently competitive hence the anti competitive entry regulation policies are more justifiable if the final goods market is characterised by decreasing returns to scale technologies

reforms globalization and endogenous agricultural structures in this paper i draw lessons from two quasi natural experiments the transition process in former communist countries and the rapid globalization of food chains on the optimality of farms and agricultural structures more generally i argue that a the farm structures that have emerged from the transition process are much more diverse than expected ex ante b this diversity is to an important extent determined by economic mechanisms which are influenced by initial conditions eg technology and reform policies c non traditional farm structures have played an important role during transition since they were optimal to address the specific institutional and structural constraints imposed by the transition process d there is more diversity than often argued in the farms that are integrated in global food chains e endogenous institutional contracting innovations in food chains may lock existing farm structures in a long run institutional framework and f indicators based on farm structures are not a good measure of welfare effects of the globalization of food chains

research note the researcher as a consumer of scientific publications how do name ordering conventions affect inferences about contribution credits when researchers from different fields with different norms collaborate the question arises of how name ordering conventions are chosen and how they affect contribution credits in this paper we answer these questions by studying two disciplines that exemplify the two cornerstones of name ordering conventions lexicographical ordering i e alphabetical ordering endorsed in economics and nonlexicographical ordering i e ordering according to individual contributions endorsed in psychology inferences about credits are unambiguous in the latter arrangement but imperfect in the former because alphabetical listing can reflect ordering according to individual contributions by chance we contrast the fields of economics and psychology with marketing a discipline heavily influenced by both based on archival data consisting of more than 38 000 journal articles we show that the three fields have different ordering practices in two empirical studies with 351 faculty and graduate student participants from all three disciplines as well as in a computer simulation we show that ordering practices systematically affect and shape the allocation of perceived contributions and credit whereas strong disciplinary norms in economics and psychology govern the allocation of contribution credits a more heterogeneous picture emerges for marketing this lack of strong norms has detrimental effects in terms of assigned contribution credits

consistency in performance rankings the peru water sector regulators can utilize a number of alternative methodologies for comparing firm efficiency but these approaches need to be robust to be accepted by stakeholders this study evaluates the consistency of water utility performance rankings for peruvian water utilities the results indicate that data envelopment analysis dea and stochastic frontier analysis sfa yield similar rankings in this case in addition the techniques have comparable success for identifying the best and worst performing utilities however these rankings based on sophisticated statistical techniques are not highly correlated with those developed by the peruvian water regulator sunass this result does not invalidate the performance rankings obtained by the regulator since those rankings are based on more dimensions of utility performance however they illustrate the importance of developing sound techniques for identifying weak utilities improvements in sector performance require that benchmarking be given greater attention t

institutional reform and labor reallocation during transition theory evidence from polish agriculture abstract reallocation of agricultural labor during transition differs widely between regions and countries our analysis shows that agricultural labor reallocation in poland is determined by a the dramatic adjustment of prices and production costs caused by price liberalization and subsidy cuts b regional differences in farm organization and the impact of institutional reforms on these organizations c structural problems constraining intersectoral mobility the latter limit the benefits from the institutional reforms long term efficiency gains and sustainable rural development are conditional upon reducing such structural constraints and improving the functioning of the labor market

farm size productivity and returns to scale in agriculture revisited a case study of wine producers in south africa abstract the inverse relationship between farm size and productivity has almost become a stylised fact in the economic development literature most of the studies contributing to this preception have been flawed by methodological shortcomings and the request is that these studies be treated with caution using recent farm survey data from the wine producing areas of the western cape of south africa this study attempts to overcome some of the methodological problems distinguishing between partial and total productivity measures using data envelopment analysis most of the wine grape producers were found to operate under constant returns to scale co operative membership seemed to overcome the economies of scale associated with processing and marketing the inverse relationship between farm size and both land productivity and total factor productivity is weak not consistently negative and differs between regions thus caution must be used when advocating rural development policies based on the inevitability of an inverse relationship existing in all sectors and production regions of agriculture

behavioural and material determinants of production relations in agriculture in this essay we develop a framework for analysing the major institutions governing the production and exchange of output and the primary factors of production in rural areas the analysis incorporates general considerations of risk and information constraints jointly with the principal material attributes of agriculture and of agricultural production factors the framework is used to analyse barriers to the existence of the major intertemporal and factor markets it is applied specifically to land scarce environments for which it provides an internally consistent explanation for many of the well documented institutional features of such settings in addition the analysis provides new implications for among other phenomena the inter relationships among ownership holdings operational scale family size and factor productivity for the scarcity of animal rental markets and use of animals as collateral for the renting out of land by small landowners and for the existence of plantations for certain crops

economic growth and environmental degradation when preferences are non homothetic we study the dynamics of pollution in an economic growth model with non homothetic preferences we characterize the forces that may drive the evolution of the income pollution relationship along the development process in particular we disentangle the standard accumulation mechanism which determines the intertemporal allocation of pollution from a mechanism based on the non homotheticity of preferences which leads the intratemporal allocation of expenditure between consumption and pollution abatement to depend on income as the economy develops and aggregate income grows up the fraction of income devoted to abatement increases if the income elasticity of abatement is larger than unity in this case the pollution may decrease with income even when the elasticity of pollution with respect to abatement is smaller than the elasticity of pollution with respect to emissions we numerically illustrate how this demand based mechanism determines the dynamic relationship between pollution and aggregate income

estimating technical efficiency of australian dairy farms using alternative frontier methodologies technical efficiency is estimated and examined for a cross section of australian dairy farms using various frontier methodologies bayesian and classical stochastic frontiers and data envelopment analysis the results indicate technical inefficiency is present in the sample data also identified are statistical differences between the point estimates of technical efficiency generated by the various methodologies however the rank of farm level technical efficiency is statistically invariant to the estimation technique employed finally when confidence credible intervals of technical efficiency are compared significant overlap is found for many of the farms intervals for all frontier methods employed the results indicate that the choice of estimation methodology may matter but the explanatory power of all frontier methods is significantly weaker when interval estimate of technical efficiency is examined

on impatience economic growth and the environmental kuznets curve a dynamic analysis of resource management the paper presents a dynamic analysis of natural resource management and investigates some key factors that affect optimal management and resource conservation using a recursive specification of time preferences we show how endogenous discounting and impatience can affect the motivation for both capital investments and environmental preservation we examine the relationships between economic growth and environmental quality endogenous discounting provides new insights in the economic dynamics underlying the environmental kuznets curve by treating growth as endogenous we examine how externalities and economic growth interact with each other we investigate how economic development can contribute to an increased demand for environmental preservation as an important new result we also show how poverty can contribute to environmental degradation

measuring technical efficiency and productivity growth a comparison of sfa and dea on norwegian grain production data this article compares data envelopment analysis and stochastic frontier analysis to assess efficiency and productivity growth of norwegian grain producers previous studies have dealt with either one of them and less of both for the assessment of productivity growth or regress malmquist productivity indices are derived from both approaches the data cover a 10 year period we find consistency between the approaches to the extent that 1 there are potentials for efficiency improvements but the magnitudes depends on the model applied and by segmentation of the data set 2 there has been a productivity improvement in the sector on average in the interval 30 38 in the period studied and 3 technical change has had the greatest impact on productivity indicating that producers have a tendency to catch up with the front runners in general policy makers are warned not to be indifferent with respect to the approach used for efficiency and productivity measurement as these may give different results

trading off volatility and distortions food policy during price spikes this paper analyses the trade off between price distortions and reduced volatility when governments intervened in agricultural and food markets during the recent food price spikes we develop a model to derive how much distortions a government would introduce when it cares about price stability in a situation with limited policy options we show that there is a trade off and identify the optimal combination of distortions and stability for given international price shocks and interest groups preferences for stability we compare these theoretical findings with empirical indicators on actual government interventions in staple food markets we find that several countries have been able to reduce short run price volatility in the domestic markets while at the same time allowing structural medium and long term price changes to pass through to producers and consumers however this is not the general case for many countries even when explicitly taking into account the trade off and the benefits of reducing volatility government policies appear far removed from the optimal trade off and there appears to be much room for policy improvement

collective agricultural production a solution for transition economies abstract the paper examines theoretical reasons and provides examples for productivity differences between agricultural service cooperatives and collectives service cooperatives can utilize economies of scale enhance competitiveness and provide technical information advantages that often outweighed problems of free riding low investment and excessive political intervention agricultural collectives while not adding substantial advantages are in addition associated with problems of supervision and effort supply tendencies to substitute casual workers or mechanization for regular members and low investment incentives while collective forms of organization in transition economies respond to high risk and market imperfections they do so inefficiently policies that create conditions for service cooperatives to compete may lead to large productivity gains

estimating total factor productivity growth in singapore at sectoral level using data envelopment analysis trends in total factor productivity growth tfpg are examined in the ten major sectors of singapore data are drawn from the yearbook of statistics singapore various issues and economic survey of singapore series ranging from the year 1985 to 2000 due to the heterogeneous characteristic of each sector and non availability of reliable input price data this study uses a non parametric frontier methodology known as data envelopment analysis dea to obtain the malmquist productivity index at the sectoral level the results can help singapore identify the best practice sector and laggards in three aspects efficiency change technical change and tfpg which is the qualitative productivity improvements needed for long term economic growth the three sets of productivity estimates are adjusted for effects of inflation and business cycles so that they are more reliable for policy implications this exercise will provide a platform for more detailed study on the determinants of tfp growth in different s

accounting for slacks to measure and decompose revenue efficiency in the spanish designation of origin wines with dea abstract in this paper we show how data envelopment analysis dea may be used to measure and decompose revenue inefficiency taking into account all sources of technical waste in the context of an application to assess the spanish quality wine sector in particular designation of origin do wines we try to go beyond the standard approaches which use shephard distance functions or directional distance functions to provide decomposition that incorporates slacks as a source of technical inefficiency to accomplish this we will base our analysis on a recent approach introduced in cooper et al 2011a in particular we show how an output oriented version of the weighted additive model can be used to properly identify revenue technical and allocative inefficiencies in spanish dos in the application we conclude that the main source of revenue inefficiency in this sector is technical waste and that cava can be highlighted as the do that performs as a benchmark for more numbers of units

preferences technology and the environment understanding the environmental kuznets curve hypothesis we derive a simple expression for the income pollution path using the standard static model of the environmental kuznets curve ekc this expression makes it straightforward to identify the general characteristics of utility and pollution functions that lead to such a curve we show that suitable preferences can always lead to an ekc while there is no technology that yields an ekc for all types of preferences and we derive a sufficient condition for technology that leads to an ekc for almost all types of preferences our results hold for a model with multiple goods with different pollution intensities and for a production economy with nonconstant relative price of consumption and environmental effort we derive our results without assuming specific functional forms and we encompass several other models as special cases

determinants of technical efficiency of crop and livestock farms in poland la pologne est l un des pays d europe de l est candidats a une accession a l union europeenne qui rencontre de graves problemes de restructuration agricole l article etudie l efficacite technique en 2000 d exploitations agricoles individuelles polonaises specialisees en elevage et en grandes cultures l efficacite est estimee par la methode de frontiere stochastique et sa variabilite statistique evaluee par la construction d intervalles de confiance l article examine egalement les determinants de l efficacite les resultats obtenus pas la methode de frontiere stochastique sont compares avec ceux obtenus par la methode de data envelopment analysis dea en moyenne l efficacite technique des exploitations d elevage est superieure a celle des exploitations de grandes cultures pour les deux specialisations la relation entre l efficacite et la taille des exploitations est positive les grandes exploitations sont les plus efficaces les resultats obtenus par la methode de frontiere stochastique sont generalement confirmes par la methode dea la qualite de la terre et le degre d integration dans les marches d aval sont d importants determinants de l efficacite la faible education est un obstacle majeur a l efficacite en particulier pour les exploitations de grandes cultures de plus celles ci utilisent beaucoup les marches de facteurs terre et travail alors que les exploitations d elevage utilisent plutot leurs propres terres et le travail familial