sense and sustainability revisited the limits of total factor productivity measures of sustainable agricultural systems many economists have advocated and applied total social factor productivity tsfp i e total factor productivity estimated with both market and non market inputs and externalities and with all factors valued at social prices as a single all embracing measure of agricultural sustainability this paper reviews the conceptual and practical issues in measuring tsfp and shows that no one measure alone will be theoretically or empirically robust as an indicator of sustainability tsfp is a conceptually flawed measure since inclusion of non market inputs and outputs and social price based valuation in most cases violates the theoretical basis underlying those estimates trends in tsfp also have limited value in diagnosing the nature of sustainability problems unless changes in productivity are related to underlying changes in technology human and physical infrastructure and indicators of resource quality more attention needs to be given to defining key indicators of agro ecosystem health and relating these measures to trends in productivity this analysis must be sufficiently disaggregated and for a long enough time period to allow for spatial and temporal variability inherent in agricultural production secondary data at the district level on both conventional inputs and outputs and resource quality have recently allowed more quantitative estimates of sustainability and its causes with limited data yield growth decomposition analysis can often be used to provide valuable insights into sustainability problems meanwhile there is a need to invest in long term experimental and panel surveys of farmers and their fields for key production systems in order to provide long term data that will allow full productivity accounting using more formal statistical procedures regardless of the approach selected the findings of this paper strongly suggest a need for economists agronomists and soil scientists to collaborate in integrating approaches in order to provide more robust and informative measures of sustainability

agricultural extension transactions costs and supply response discussion henning henningsen and henningsen 2011 develop an elegant and appropriate model which is used to investigate the relationship between networks and individual transaction costs as well as to use polish data to empirically estimate the impact of networks on farmers transaction costs in both agricultural input and output markets the strength of the paper lies in its theoretical portion and thus my comments are focused mainly on the empirical portion first off while this may be due to the page limit the empirical part is much less transparent than the theoretical part in order to isolate the impact of networks on transactions it is important to control for other potential factors such as road access and market size which may also affect transaction costs the paper is rather ambiguous with respect to this point second the paper claims that the empirical findings support the central hypotheses as derived from the theoretical model assuming inputs are locally traded and outputs are globally traded as to this point it would be nice to cite some evidence to back up this assumption for instance it is not apparent why outputs such as livestock should be traded globally while input markets such as pesticides should be traded locally third suppliers often take advantage of the network effects by clustering together many agricultural or industrial productions are cluster based porter 2000 long and zhang 2011 in a cluster the inherent fierce competition and easy information flow cause price to become transparent this makes it almost impossible for either buyers or suppliers to cheat on prices the competitive

valuing option existence and bequest demands for wilderness to assess the relative importance of current costs and future benefits of nuclear waste storage we develop a simple model of bequest value the basic model of nonparternalistic altruism is extended to account for the uncertain nature of the externality

an economic model of soil conservation by introducing soil depth and soil loss into a simple model of agricultural production this paper seeks to determine when the private path of erosion differs from the socially optimal path considering the depletion of soil only and abstracting from the environmental disruption caused by erosion the paper argues that under most institutional arrangements the social and private rates of erosion are the same the paper concludes that public policy should be directed toward reducing erosion only when it leads to significant pollution externalities

interpreting econometric evidence the behaviour of consumers expenditure in the uk abstract the dynamic models of consumers expenditure proposed by davidson et al 1978 and hendry and von ungern sternberg 1979 are re appraised in the light of hall s 1978 analysis of the empirical implications of the life cycle permanent income hypothesis in particular that the series for consumption should obey a random walk apart from trend in an attempt to reconcile the conflicting findings monte carlo experiments are used to demonstrate that if the davidson et al model were actually correct the hall model would appear to give a good description of the data and would probably not be rejected all the models are re estimated with new data for the uk and these data do reject a modified random walk specification in conclusion we discuss the issue of income exogeneity and comment on questions of model selection and interpretation

ecological economic analysis of wetlands scientific integration for management and policy abstract wetlands all over the world have been lost or are threatened in spite of various international agreements and national policies this is caused by 1 the public nature of many wetlands products and services 2 user externalities imposed on other stakeholders and 3 policy intervention failures that are due to a lack of consistency among government policies in different areas economics environment nature protection physical planning etc all three causes are related to information failures which in turn can be linked to the complexity and invisibility of spatial relationships among groundwater surface water and wetland vegetation integrated wetland research combining social and natural sciences can help in part to solve the information failure to achieve the required consistency across various government policies an integrated wetland research framework suggests that a combination of economic valuation integrated modelling stakeholder analysis and multi criteria evaluation can provide complementary insights into sustainable and welfare optimising wetland management and policy subsequently each of the various components of such integrated wetland research is reviewed and related to wetland management policy

a test of the equality of closed ended and open ended contingent valuations a test is developed to find whether open ended and closed ended contingent valuation mechanisms lead to significantly different results the test is based on joint estimation of willingness to pay responses to open and closed ended questions asked of the same sample of individuals in a public good example individuals do respond differently depending on question format possible explanations include different incentives for strategic behavior and respondents lack of familiarity with the open ended question type no differences in willingness to pay were found in a private good example

on forecasting uk consumption this paper is concerned with the search for the appropriate methodology for constructing an econometric model for forecasting aggregate consumption forecasts of the various national income categories such as consumption investment exports etc is an important pre requisite of macroeconomic policy it is such forecasts welded within the framework of a macroeconomic model which provide the policy makers with the information on which to base economic policy ideally a good forecasting model should have the properties of 1 being parsimonious in the use of information especially current information on endogenous variables 2 be simple to manipulate and 3 should work well in the econometric sense a fourth criterion namely being strongly founded in economic theory is more open to dispute for example the time series forecasting models developed by box and jenkins need not rely on economic theory at all without pushing the point too far one could argue that at least to economists economic theo

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 soil quality index and its relationship to efficiency and productivity growth measures two decompositions this article reconciles two notions of soil quality indexes with the economic concepts of technical efficiency and productivity growth an example uses data from the u s department of agriculture s experimental fields in maryland and data envelopment analysis techniques to estimate a soil quality index consistent with the notion of technical efficiency common regression techniques shed additional light on the role of individual soil quality properties in a very restricted linear approximation of the estimated soil quality index

why did japan s household savings rate fall in the 1990s this study investigates empirically why japan s household savings rate fell in the 1990s we constructed an economic model consisting of two types of household unconstrained life cycle households and liquidity constrained households unconstrained households generally save but liquidity constrained households consume all of their disposable income we found that the proportion of liquidity constrained households increased sharply in the late 1990s which led to a decline in japan s household savings rate our simulation analysis demonstrates that if the proportion of liquidity constrained households in the 1990s had stayed at the level as that of the late 1980s the household savings rate would have increased by four points in 2001 and 2002

exploring futures for amazonia s sierra del divisor an environmental valuation triadics approach to analyzing ecological economic decision choices in the context of major shifts in boundary conditions abstract this text presents a new methodological approach to ecological economic analysis employing georgescu roegen s flow fund theory of economic process it offers an alternative to monetary valuation based analyses and aims to contribute toward advancing work concerned with addressing complex ecological economic questions as complete wholes the methodology is demonstrated through reference to the empirical case of a proposed rail link between peru and brazil which would cut across the sierra del divisor of western amazonia connecting the pacific and atlantic coasts and further opening up the amazon commodity frontier in order to analyze the potential impacts of the rail link four flow fund representations of economic process two at the regional and two at the local level are developed in order to juxtapose two alternative political economy contexts that might govern the rail link s impacts in the region one where conservation is prioritized over cash income and one where it is not our results suggest that completion of the rail link under the current political economy context which prioritizes cash income over conservation is likely to have substantial negative consequences for forest conservation in both peru and brazil and for local livelihoods throughout the region

adoption of agricultural innovations in developing countries a survey this paper reviews various studies which have provided a description and possible explanation to patterns of innovation adoption in the agricultural sector the survey points out that the tendency of many studies to consider innovation adoption in dichotomous terms adoption nonadoption may not be appropriate in many cases where the actual decisions are defined over a more continuous range more attention needs to be given to the socio cultural and institutional environment in area studies so that their interrelation with economic factors affecting adoption can be inferred the presence of several interrelated innovations is another aspect that needs to be considered more carefully in future research since a number of simultaneous decisions may be involved furthermore the possibility of regular sequential patterns in adopting components of a new technological package should be specifically addressed in future studies finally the impact of differential adoption rates on land holding distribution merits attention in future research

substitution effects in the valuation of multiple environmental programs abstract a theoretical framework for understanding substitution and complementary effects between environmental programs is derived a multiple program valuation function is specified and its structure analyzed a maximum likelihood estimator is derived to estimate the parameters of the valuation function using referendum type contingent valuation data the empirical analysis shows that the conventional benefit aggregation approach of independent valuation and summation overstates the benefits of two and three program policies by an average of 24 and 54 respectively

consumption and capital market imperfections an international comparison the excess sensitivity of consumption to current income fluctuations is higher in countries where consumers borrow less low levels of consumer debt can result either from capital market imperfections or from a low demand for loans the evidence suggests that the former view is more appropriate than the latter and thus supports the hypothesis that excess sensitivity may be attributed to liquidity constraints rather than to other factors copyright 1989 by american economic association

influence of soil conservation on farm land values worldwide concern for the loss of agricultural soil has led many governments to establish programs to slow the loss of soil from farms mcconnell 1983 has shown however that in the absence of externalities farmer decisions on investment to reduce onfarm soil loss can be socially optimal and concludes p 188 as follows increasing soil loss does not imply that farmers ignore physical production relations if farmers know that the soil base affects farm resale value they will conserve it it suggests that the impact of soil depth on the value of farms be investigated earlier rausser 1980 reached a similar conclusion suggesting that land values which fail to reflect soil quality encourage the farmer to ignore his long run impact on the resource two recent studies failed to find clear cut relationships between soil erosion and farm land prices ervin and mill 1985 942 in a cross section study of farm land prices in page county iowa concluded the group of variables measuring past and future erosion damages and conservation structures did not exhibit large and reliable effects gardner and barrows 1985 studied the capitalization of the value of soil conservation practices into farm land prices in southwestern wisconsin and concluded p 946 the most reasonable conclusion is the most obvious conservation

productivity growth in u s agriculture under dynamic adjustment a dynamic measure of productivity growth adjusted for deviations from the long run equilibrium is established within an adjustment cost framework an empirical application to u s agriculture is presented which permits identifying the dynamic linkages between technical change and productivity growth in u s agriculture total factor productivity as dynamically measured grew at 1 50 per annum the combined effect of scale quality adjusted input growth and long run disequilibrium input use contributes only 3 44 of the growth while technical change dominates the growth of total factor productivity

threshold effects and incentives for the conservation of biodiversity biological diversity is a central component of the stock of natural capital on which all economic development is based other things being equal loss of biologically diversity implies loss of development potential and its conservation through sustainable use or outright protection implies the protection of that potential one characteristics of biodiversity loss of especial importance is that biodiversity loss more than any other current environmental problem is associated with ecological threshold effects the paper explores the implication of this characteristics for the properties of a biodiversity conservation strategy

economic valuation of biodiversity sense or nonsense this paper critically evaluates the notion and application of economic monetary valuation of biological diversity or biodiversity for this purpose four levels of diversity are considered genes species ecosystems and functions different perspectives on biodiversity value can be characterized through a number of factors instrumental vs intrinsic values local vs global diversity life diversity vs biological resources etc a classification of biodiversity values is offered based on a system of logical relationships among biodiversity ecosystems species and human welfare suggestions are made about which economic valuation methods can address which type of biodiversity value the resulting framework is the starting point for a survey and evaluation of empirical studies at each of the four levels of diversity the contingent valuation method is by far the most used method an important reason is that the other valuation methods are unable to identify and measure passive or nonuse values of biodiversity at first sight the resulting monetary value estimates seem to give unequivocal support to the belief that biodiversity has a significant positive social value nevertheless most studies lack a uniform clear perspective on biodiversity as a distinct concept from biological resources in fact the empirical literature fails to apply economic valuation to the entire range of biodiversity benefits therefore available economic valuation estimates should generally be regarded as providing a very incomplete perspective on and at best lower bounds to the unknown value of biodiversity changes 2001 elsevier science b v all rights reserved

the economic benefits of surface water quality improvements in developing countries a case study of davao philippines two nonmarket valuation techniques the contingent valuation method and travel cost model are used to estimate the economic value that people in davao philippines place on improving the water quality of the rivers and sea near their community the contingent valuation and travel cost estimates are very close to each other and are quite low both in absolute terms and as a percentage of household income these findings suggest that water pollution control is simply not a high priority for davao s residents and support the argument that households willingness to pay for environmental amenities such as improved water quality is low

economic valuation of the leuser national park on sumatra indonesia abstract the leuser ecosystem in northern sumatra is officially protected by its status as an indonesian national park nevertheless it remains under severe threat of deforestation rainforest destruction has already caused a decline in ecological functions and services besides it is affecting numerous economic activities in and around the leuser national park the objectives of this study are twofold firstly to determine the total economic value tev of the leuser ecosystem through a systems dynamic model and secondly to evaluate the economic consequences of deforestation versus conservation disaggregating the economic value for the main stakeholders and regions involved using a dynamic simulation model economic valuation is applied to evaluate the tev of the leuser national park over the period 2000 2030 three scenarios are considered conservation deforestation and selective use the results are presented in terms of 1 the type of benefits 2 the allocation of these benefits among stakeholders and 3 the regional distribution of benefits the economic benefits considered include water supply fisheries flood and drought prevention agriculture and plantations hydro electricity tourism biodiversity carbon sequestration fire prevention non timber forest products and timber the stakeholders include local community members the local government the logging and plantation industry the national government and the international community the regions considered cover the 11 districts involved in the management of the leuser ecosystem with a 4 discount rate the accumulated tev for the ecosystem over the 30 year period is us 7 0 billion under the deforestation scenario us 9 5 billion under the conservation scenario and us 9 1 billion under the selective utilisation scenario the main contributors in the conservation and selective use scenarios are water supply flood prevention tourism and agriculture timber revenues play an important role in the deforestation scenario compared to deforestation conservation of the leuser ecosystem benefits all categories of stakeholders except for the elite logging and plantation industry

measuring soil quality dynamics a role for economists and implications for economic analysis measuring soil quality is extremely difficult yet it has clear economic importance in particular there is a great deal of empirical interest in the dynamics of soil quality evolution when land managers respond to policies and other incentives yet current methodologies for measuring changes in agricultural land quality are largely static and rely heavily either on incomplete measures such as proxy variables or ad hoc indexes of selected soil characteristics moreover much empirical work relies on static econometric techniques or simulation models in this paper we develop a means to infer soil quality changes from input and output data using a dynamic production function model using data from field experiments we estimate the model in a way that allows the recovery of a dynamic measure of soil quality whose evolution depends on variations in management practices our methodology and findings will help provide firmer empirical foundations for analyses of the economic implications of land degradation and the soil quality implications of agricultural policies

construct validity of averting cost measures of environmental benefits construct validity is concerned with the consistency of empirical measures with theoretical relationships this paper reviews and extends the theoretical relationship between averting costs and willingness to pay measures of these two theoretical constructs with empirical averting costs savings and contingent valuation from one population are used to establish construct validity of the averting cost technique used empirical results indicate that the contingent valuation and averting costs measures have a low correlation although low correlation is consistent with the construct validity of averting costs measures these results indicate that inferences from averting cost measures are quite limited

valuing biodiversity for use in pharmaceutical research biodiversity prospecting has been touted as a mechanism for both discovering new pharmaceutical products and saving endangered ecosystems it is unclear what values may arise from such activities however evidence from transactions is incomplete and existing theoretical models are flawed we calculate an upper bound on the value of the marginal species even under favorable assumptions this bound is modest slightly modified assumptions lead to drastically lower estimates we extend our findings to the value of the marginal hectare of habitat and find that the incentives for habitat conservation generated by private pharmaceutical research are also at best very modest

the impact of education on subjective discount rate in ugandan villages abstract heterogeneity in time discounting may reinforce the existing barriers to save and invest faced by rural populations in developing countries we elicit a subjective discount rate for a varied sample of ugandan villagers in accordance with other studies we have found the discount rate to decrease with education we examine this correlation further by testing the causal effect of education and exploit two different sources of its variation school frequency across villages and the number of the respondents school going years that overlap with the era of the dictator idi amin s rule for men we find that education has a significant impact on their discount rate similar in magnitude for both types of instruments and robust to observable characteristics this finding highlights the importance of education in development

use of dichotomous choice nonmarket methods to value the whooping crane resource market prices for endangered wildlife species rarely exist when prices do exist they arc not likely to reflect accurately individual preferences both consumptive uses such as hunting fishing and trapping boyle and bishop 1985 stou and johnson brookshire eubanks and randall and more esoteric benefits such as viewing and existence values must be considered this article is addressed to the valuation of whooping cranes grus americana a prominent endangered species the purpose of this article is to present a methodology for estimating nonconsumptive benefits associated with the existence of an endangered species a dichotomous choice form of contingent valuation is applied to quantify individuals economic surplus associated with preservation of the whooping crane resource specific issues and limitations of the empirical approach are discussed some of which have been previously examined by bishop and heberlein 1979 and hanemann the present paper expands upon earlier work in several ways fit in addition to discussing the above issues a unique application of the approach to an endangered species is presented second three model specifications are examined two of which arc consistent with utility theory and one which is not hanemann ti again following hanemann economic surplus is estimated at the sample median as well as the mean the dii cussion of the last two issues sheds sit on their implications for estimation of economic surplus throughout the article the suitability of alternative estimation techniques for dichom mous choice or referendum style data is examined the methodological and empirical results are relevant to a number of cumnt issues regarding model specification choice of binary response model and choice of estimator for equivalent surplus hanemann boyle and bishop 1984 sellar chavas and stoll

monetary valuation in life cycle assessment a review abstract monetary valuation is the practice of converting measures of social and biophysical impacts into monetary units and is used to determine the economic value of non market goods i e goods for which no market exists it is applied in cost benefit analysis to enable the cross comparison between different impacts and or with other economic costs and benefits for this reason monetary valuation has a great potential to be applied also in life cycle assessment lca especially in the weighting phase however several challenges limit its diffusion in the field which resulted in only a few applications so far the authors have performed a review of different monetary valuation methods for use in lca firstly monetary valuation approaches methods and lca applications were identified secondly key features and the strengths and weaknesses of each monetary valuation method were determined finally monetary valuation methods and lca applications were evaluated according to a comprehensive set of criteria ranging from scientific foundation to uncertainty and complexity it was found that observed and revealed preference methods and the abatement cost method have limited applicability in lca whereas the choice experiment method and the budget constraint method are the best options for monetary valuation in lca

peasant household behaviour with missing markets some paradoxes explained a model of peasant household behavior under varying degrees of household specific food and labor market failures is constructed to show that these structural features can explain several well known patterns of peasant response which have often been attributed to peculiar motives presumed specific to peasants the model explains sluggish response to cash crops prices and high instability in perceived food and labor scarcities the key role of manufactured consumer goods prices in stimulating peasants effort in cash crops production the effectiveness of taxation as opposed to incentives in stimulating cash crops production and the key role of technological change in food production to enhance cash crop production results are obtained analytically in the case of one market failure and by numerical simulation with more than one

soil conservation with uncertain revenues and input supplies shortle and stefanou provide a conceptual extension of the single period static generalized meanvariance model gmvm to the multiperiod dynamic case in doing so they illustrate the linkage between the selection of activities in the first period to production opportunities in the second and by extension subsequent time periods in the context of analyzing the adoption of soil loss control practices they correctly argue that the static model employed in our analysis ignores any benefits that adopting these practices might have on future production opportunities their criticisms however are essentially no different than those levied against static models used in other types of analyses regardless of the type of risk attitudes attributed to the representative decision maker that is their comments hold equally well for risk neutral static models of soil conservation behavior the purpose of our work however was to demonstrate the effects of uncertainty and risk aversion on the selection of crop and soil loss control activities as compared to the risk neutral case our purpose was not to analyze the time path of bmp adoption or erosion although we agree that this is an interesting research topic in the context of our

ecotourism demand and differential pricing of national park access in costa rica ecotourism presents developing countries with growing opportunities for enhancing resource conservation and economic growth but also raises pressing management and policy challenges this paper presents a conceptual framework and empirical analysis of the impacts of introducing a differential entrance fee policy at three national parks in costa rica data are collected using a contingent behavior methodology designed to elicit information on foreign tourists hypothetical park visitation behaviors at alternative entrance fee levels park visitation demand functions and price and income elasticities are estimated revenue maximizing fees are calculated and applications of differential pricing principles to park management are discussed

returns to spending on agricultural extension the case of the national agricultural advisory services naads program of uganda the aim of this paper is to assess the direct and indirect impacts of the agricultural extension system of uganda the national agricultural advisory services naads program on household agricultural income data from two rounds of surveys of ugandan rural farm households conducted in 2004 and 2007 as well as different program evaluation methods and model specifications are used to estimate impacts and compute a rate of return the direct and indirect impact of the program is estimated at 37 95 and 27 55 increase in per capita agricultural gross revenue between 2004 and 2007 for households participating directly and indirectly in the program respectively compared to nonparticipants the rate of return on the program s expenditures is estimated at 8 49 the program has been relatively more effective among male headed larger and asset poor households as well as those taking up noncrop high value enterprises and living further away from financial services all weather roads and markets or located in the eastern and northern regions policy implications of the results are drawn

the value of biodiversity markets society and ecosystems the value of biodiversity is discussed at different levels including market value non market values to humans and the value of biodi versity to ecosystems the main conclusion is that although market exchange values of environmental services may be used to justify biodiversity protec tion measures it must be stressed that exchange value constitutes a small portion of total biodiver sity value the total value of existing biodiversity is largely unknown but indications are that it is essen tial to human existence the various levels of biodi versity value point to the need for a hierarchical and pluralistic methodology to determine appropri ate policies for its preservation jel q21 i introduction among ecologists there is a general con sensus that biodiversity1 is of critical impor tance to the health of ecosystems and even for the long term survival of the human species there is also a consensus that bio diversity is being lost at a rate which is a cause for concern 2 economists on the other hand generally view biodiversity as just an other good which is to be placed in the basket of market choices just as any other the discussion of the specifics of biodiver sity policy has been unsatisfactory partly because of the different meanings of the word value used by economists and ecolo gists many ecologists fail to understand the logic of market allocation and why biologi cal resources are used in seemingly irra tional ways many economists fail to ap preciate the narrowness of the concept of economic value as indicated by relative prices determined by market exchange fol lowing anderson 1966 and brown 1984 the discussion below considers economic measures of value to be species of the genus assigned value which belongs to the family value many biologists and paleontologists be lieve that we are at a critical point in the history of the human species and perhaps even in the 600 million year history of com plex multicelled life on earth if the paleon tologists and biologists who study the phe nomenon of mass extinction are correct the current human induced mass extinction may be of the same order of magnitude as the five other major extinction episodes which destroyed between 20 and 96 percent of existing species on the planet ehrlich and ehrlich 1992 ward 1994 wilson 1992 we are living in a truly remarkable period in earth s 41 billion year history the valua tion decisions our species has made in the recent past and will make during the next few decades will determine the fate of life on earth for the next tens of millions of years it is critical to clarify the language and concepts we use to estimate the value of biodiversity and thus policies leading to its destruction or preservation the importance attached to the issue of biodiversity preservation necessarily in volves ethical judgments about duty to fu ture generations and responsibility toward the nonhuman natural world although in dividuals hold a variety of conflicting beliefs about human responsibility to the natural world this does not mean that policy choices

the effect of technical progress on erosion damage and economic incentives for soil conservation tion service scs was established by congress in response to the alarm generated by the high erosion rates observed during the dust bowl days through technical assistance provided by scs and through cost share payments made by the agricultural conservation and stabilization service farmers have been encouraged to adopt conservation practices designed to reduce soil loss from agricultural lands but after more than 40 years of effort soil loss rates remain excessive on 97 million acres usda 1980 6 the long term productive potential of these lands is being impaired by excessive erosion in this paper a damage function which incorporates the long run cost of erosion to a farmer is presented and applied to evaluate conservation tillage in the palouse wheatland of the pacific northwest the role of technology in the conservation adoption decision is explored to see if policy implications for the control of erosion in the region can be drawn from the analysis as erosion proceeds its cumulative effect is evident in reduced crop yield of the numerous factors that affect crop yields many are related to erosion damage soil moisture organic matter content fertility and soil structure are examples the depth of topsoil remaining is used as a proxy in this analysis for various variables related to erosion which impact crop yields although cumulative soil erosion may diminish the future productivity of soil apparently some operators continue to mine soil by using erosive farming practices which offer higher yields currently some practices for reducing soil erosion may impose a double penalty on farmers in the form of lower yields and higher costs currently these detriments to short run profits may discourage farmers from adopting methods of soil conservation however farm operators who ignore the long term effects of erosion may be mortgaging the future in their pursuit of current profits

why is consumption so smooth for thirty years it has been accepted that consumption is smooth because permanent income is smoother than measured income this paper considers the evidence for the contrary position that permanent income is in fact less smooth than measured income so that the smoothness of consumption cannot be straightforwardly explained by permanent income theory the paper argues that in postwar u s quarterly data consumption is smooth because it responds with a lag to changes in income

locus of control and technology adoption in developing country agriculture evidence from ethiopia abstract we investigate the implication of farmers locus of control on their technology adoption decisions our empirical analysis is based on two longitudinal surveys and hypothetical choice exercises conducted on ethiopian farmers we find that locus of control significantly predicts farmers technology adoption decisions including use of chemical fertilizers improved seeds and irrigation we show that individuals with an internal locus of control have higher propensity of adopting agricultural technologies we observe these empirical regularities in both datasets and for both revealed measures of farmers technology adoption decisions as well as farmers hypothetical demand for agricultural technology the results hold even in a more conservative fixed effects estimation approach assuming locus of control as time variant and dynamic behavioral trait these findings provide behavioral and psychological explanations for the low rates of adoption of profitable agricultural technologies in sub saharan africa our results highlight that improving farmers non cognitive skills locus of control may facilitate technology adoption and agricultural transformation more generally the results suggest that anti poverty policies that only focus on relaxing short term external constraints including physical access to markets and technologies may not sufficiently alleviate agricultural underinvestment

valuing environmental functions tropical wetlands recent studies have suggested that tropical wetland systems may have a crucial economic role to play in development the following paper provides an overview of these benefits using the general framework of cost benefit analysis as the methodological approach to assessing wetland values an analysis of trade offs between conserving or converting tropical wetlands demonstrates that taking into account the opportunity cost of wetland loss leads to a lower level of conversion than would otherwise be the case finally the paper discusses the extensions and limitations of the production function approach as applied to valuing nonmarketed wetland benefits

traditional vs modern production systems price and nonmarket considerations of cacao producers in northern ecuador many factors besides profit maximization such as nonmarket ecological and social benefits influence smallholder households to adopt a specific agricultural production system or sell in a particular market thus different analytical techniques are needed that take into consideration more than monetary income to fully capture these additional benefits to better understand the production decisions of smallholder farmers we build on previous work on the household model and shadow wage estimation to develop a shadow wage for ecuadorian cacao producers that includes these nonmarket benefits we found that the shadow wage correctly indicated that on average these households would prefer to use an agroforestry production system instead of the more profitable modern system because of the nonmarket benefits received from the former system

capturing the complexity of biodiversity a critical review of economic valuation studies of biological diversity biodiversity is a highly complex and abstract ecological concept even though it is not one physical entity it influences human well being in multiple ways mostly indirectly while considerable research effort has been spent on the economic valuation of biodiversity it remains to be a particularly challenging valuation object valuation practitioners therefore have to use proxies for biodiversity many of which are very simple single species habitats this paper presents a comprehensive and critical review of biodiversity valuation studies with special emphasis on biodiversity valuation in order to depict the state of the art in this research field it develops evaluation criteria so as to identify best practice applications and shows that the field of biodiversity valuation studies is rather heterogeneous regarding both valuation objects and valuation methods on the basis of our evaluation criteria and best practice studies we suggest that to account for the complexity and abstractness of biodiversity multi attribute approaches with encompassing information provision should be used that emphasise the roles biodiversity plays for human well being

valuing ecosystem goods and services a new approach using a surrogate market and the combination of a multiple criteria analysis and a delphi panel to assign weights to the attributes a new approach to valuing ecosystem goods and services egs is described which incorporates components of the economic theory of value the theory of valuation usnot vert similarappraisal a multi model multiple criteria analysis mca of ecosystem attributes and a delphi panel of experts to assign weights to the attributes the total value of ecosystem goods and services in the various tenure categories in the wet tropics world heritage area wtwha in australia was found to be in the range aud 188 to 211 million year 1 or aud 210 to 236 ha 1 year 1 across tenures as at 30 june 2002 application of the weightings assigned by the delphi panelists and assessment of the ecological integrity of the various tenure categories resulted in values being derived for individual ecosystem services in the world heritage area biodiversity and refugia were the two attributes ranked most highly at aud 18 6 to 20 9 million year 1 and aud 16 6 to 18 2 million year 1 respectively

balancing rural poverty reduction and citizen participation the contradictions of uganda s decentralization program abstract uganda s ambitious decentralization program is analyzed in terms of a dual mode system of local governance under a technocratic mode conditional funding from the center is earmarked for particular programs but with little local participation in contrast the patronage mode is an elaborate system for local bottom up planning but with limited resources which are largely consumed in administrative costs and political emoluments along with the spoils of a committee system controlling contracts and appointments these resources provide the means for building political alliances and loyalty in the absence of a culture of transparency and civic engagement to assure downward accountability it remains to be seen whether decentralization can promote both efficient service delivery and local empowerment simultaneously

stochastic implications of the life cycle permanent income hypothesis evidence for the u k economy where et is white noise hall s stated purpose in deriving this equation was to provide a testable implication of the pure life cycle permanent income hypothesis which avoided the econometric problems associated with a consumption function in which measured income is included as an explanatory variable the testable implication is that apart from this period s consumption expenditure no variable observable in this or in earlier periods should show any predictive power for next period s consumption expenditure for u s quarterly data 1948 l 1977 l hall found this to be the case with the exception of movements in the real value of corporate stock i given the importance of the hypothesis it would seem worthwhile to examine the extent to which it is substantiated by alternative economic histories and so we present here the results obtained from u k quarterly data in the postwar period

the assessment consumer expenditure this article aims to illuminate two sets of consumption puzzles the first concerns the behavior of aggregate saving rates in the 1980s and early 1990s collapse and rebound in scandinavia and the u k and apparently a more secular decline in the u s the second set of puzzles concerns various apparent contradictions of the rational expectations permanent income hypothesis e g in time series the excess sensitivity of consumption changes to anticipated income changes and in cross sections the tendency of consumption and income age profiles to follow each other more than standard life cycle theory implies the article discusses in relatively non technical terms the implications both for euler equations and solved out consumption functions of introducing uncertainty credit constraint consumption leisure interactions habits and durability alternative to rational expectations the illiquidity of some assets and financial deregulation it also compares the merits of euler and solved out models of aggregate consumption

networks and transaction costs based on the well known fact that social networks can provide effective mechanisms that help to increase the trust level between two trade partners we apply a simple game theoretical framework to derive transaction costs as a high risk of opportunistic behavior in a repeated trade relation determined by the density and size of trading networks in the empirical part of the paper we apply a two stage procedure to estimate the impact of social network structures on farm s transaction costs observed for different input and output markets at a first stage we estimate a multiple input multiple output stochastic ray production function to generate relative shadow prices of three inputs and two outputs traded by farms at a second stage a structural equation system is derived from the first order conditions of farm s profit maximization to estimate simultaneously the of commodity specific transaction cost functions for all traded farm inputs and outputs estimation results based on a sample of 315 polish farms imply a significant influence of social network structures on farm s transaction costs moreover estimated transaction costs correspond to a reasonable amount of farm specific shadow prices this abstract was borrowed from another version of this item

specification and estimation of stochastic multiple output production and technical inefficiency this paper presents a primal based approach for specification and estimation of multiple output production frontiers that allows simultaneous identification and estimation of determinants of technical inefficiency the proposed model extends the technical efficiency effects model by battese and coelli 1995 to general multiple output technologies an empirical application using swedish health care panel data from the years 1989 1994 is included the key issue is to test for the effects on technical efficiency of an organizational reform implemented with the primary purpose to increase efficiency the results reveal no significant effect on technical efficiency of the reform but evidence of overall decreased technical efficiency and technical progress in the provision of health care over the studied time period are found

trade expansion and contract enforcement consider a world of traders separated in geographic economic or social space honest trade offers larger gains for more distant traders but frequencies of meetings and information flows about cheating have local bias honesty is self enforcing only between pairs of sufficiently close neighbors global honesty prevails only in a sufficiently small world the extent of self enforcing honesty is likely to decrease when the world expands beyond this size costly external enforcement is useful only if the world is sufficiently large and its net payoff need not be larger than that of a self governing small community intermediate size worlds fare worst

economic valuation of biodiversity a comparative study abstract in recent years an intensive debate on the economic valuation of biodiversity has entered the environmental economics literature the present paper seeks to offer first a critical review of key concepts that are essential for a proper understanding of such evaluation issues particular attention is given here to various monetary valuation approaches and to comparative i e meta analytical methods from the perspective of conservation and sustainable use of biodiversity several illustrative examples are presented in order to highlight the usefulness of the various approaches discussed next an attempt is made to infer general findings and lessons from past applied research by means of meta analysis in this context a multi dimensional technique originating from the field of artificial intelligence is deployed it allows us to identify the most important variables responsible for changes in economic estimates of biodiversity

strategies for sustainable agricultural development in the ethiopian highlands this paper investigates the impacts of population growth market access agricultural credit and technical assistance programs land policies livelihood strategies and other factors on changes in land management natural resource conditions and human welfare indicators since 1991 in the northern ethiopian highlands based on a survey of 198 villages we find that population growth has contributed significantly to land degradation poverty and food insecurity in this region in contrast better market access and some credit and technical assistance programs were associated with improvement or less decline in land quality wealth and food security suggesting the possibility of win win win development outcomes with appropriate interventions land redistribution was associated with adoption of inorganic fertilizer but also with declining use of fallow and declining soil fertility we find also that different land management practices are adopted where different livelihood strategies are pursued suggesting the importance of considering livelihood strategies in technical assistance programs development strategies should be tailored to the different comparative advantages of different locations no one size fits all strategy will work everywhere this abstract was borrowed from another version of this item

innovation grants to smallholder farmers revisiting the key assumptions in the impact pathways grant funds specifically targeted to smallholder farmers to facilitate innovation are a promising agricultural policy instrument they stimulate smallholders to experiment with improved practices and to engage with research extension and business development services providers however evidence on impact and effectiveness of these grants is scarce partly because attribution of changes in practices and performance to the grant alone is challenging and the grant is often invested in innovation processes that benefitted from other support in the past we discuss three modalities vouchers business development matching grants and farmer driven innovation support funds our review points to an important and transversal outcome area of innovation grant systems the creation of human and social capital to sustain creative thinking and innovative practices harmonising measurement on these outcomes could enhance the usefulness and comparability of impact studies and facilitate benchmarking of different policy options for smallholder innovation

an evaluation of monetary and non monetary techniques for assessing the importance of biodiversity and ecosystem services to people in countries with developing economies abstract biodiversity supports a range of ecosystems services that are of fundamental importance to people in poor countries economic valuation of biodiversity is important for the development of policies that protect biodiversity and alleviate poverty this paper provides an evaluation of monetary and non monetary techniques for assessing the value of biodiversity to people in least developed countries ldcs specifically research questions include 1 to what extent have monetary and non monetary techniques been used to assess the value of biodiversity and ecosystem services in ldcs 2 what are the key methodological practical epistemological and policy challenges to assessing the value of biodiversity and ecosystem services in ldcs 3 how can valuation methods be improved to allow more accurate valuation in ldcs

on site economic evaluation of soil conservation practices in honduras abstract factors affecting the cost to the farmer of employing soil erosion reduction strategies are examined for the steep hillsides near tegucigalpa honduras linear programming and motad are used to examine these factors results indicate that some modest reductions in erosion can be achieved at little cost to the farmer by reorganizing production switching rotations and using contour plowing these modest reductions still lead to extremely high rates of erosion sharper reductions may be achieved at progressively higher costs as erosion control structures are constructed and acreage is left fallow there is a high cost to the farmer of reducing erosion to sustainable levels a consistent tradeoff emerges between levels of soil conservation income and risk erosion reduction efforts lead to lower incomes and higher risk the analysis of likely benefits to farmers for erosion reduction shows that even under assumptions of very high yield losses from soil erosion optimal farm plans still lead to high rates of soil loss implying a need for policies that internalize externalities if off farm damages are to be minimized

the market value of water in the ogallala aquifer the ogallala aquifer also known as the ogallala formation or the high plains aquifer is a 174 000 square mile body of water that underlies parts of colorado kansas nebraska new mexico oklahoma south dakota texas and wyoming the ogallala contains about 3 5 billion acre feet of water symposium ii 1984 but in many areas the aquifer has been declining from continued deep well pumping sloggett and dickason 1986 the aquifer receives little recharge especially in the southern portion and as such represents a finite nonrenewable resource stock as a result of the concerns of residents of the high plains states over declines in the ogallala aquifer congress authorized the secretary of commerce to conduct a six state regional resources study of the ogallala in 1976 high plains associates 1982 the study indicated even under the most effective water conservation program more than a million acres of farmland then

sensitivity of contingent valuation to alternative payment schedules insensitivity to payment schedule wherein respondents do not adequately differentiate between a one time payment and a series of payments may be an important but often overlooked factor in the design interpretation and use of contingent valuation studies several contingent valuation experiments involving a familiar private good and a less familiar environmental commodity indicate that although respondents distinguished between lump sum and periodic payment schedules implicit discount rates were very high suggesting that sensitivity to payment schedule is an important subject for further study

trust in triads effects of exit control and learning this paper provides theoretical background for some effects of social networks on trust we study the implications of a model with rational actors in two settings with three actors in the first setting there are two trustees who are involved in transactions with one truster implying that the truster has an exit option in the second setting two trusters play with one trustee which gives the trusters options for voice i e complaining and informing each other about the trustee s behavior we compare these models with a baseline model in which there is only one truster and one trustee it turns out that the opportunities for placing and honoring trust do not change for the exit model compared to the baseline model the opportunities for trust in the voice model differ from the baseline model only if both trusters inform each other at a rate that is high enough only if the possibilities for receiving information and transmitting information are large enough for both trusters trust will increase due to the information exchange possibilities in the voice model

as good as the networks they keep improving outcomes through weak ties in rural uganda abstractwe examine an intervention randomized at the village level in which female farmers invited to a single training session were randomly paired with farmers whom they did not know and encourag

test retest reliability of the contingent valuation method a comparison of general population and visitor responses the reliability of the contingent valuation method is evaluated by resurveying the same general households and visitors nine months after their original survey test retest correlations on willingness to pay are statistically significant and ranged from 422 for the general population sample to 782 for the visitor sample using a paired t test there was no statistical difference between an individual s first and second reported willingness to pay chow tests comparing the original and resurvey willingness to pay functions showed no statistical difference at the 01 level reported willingness to pay is reasonably stable over the time period surveyed

an activity analysis model of the environmental performance of firms application to fossil fuel fired electric utilities the productivity of firms when some outputs pollution are undesirable has been studied in the literature for some time in this paper we introduce an environmental performance indicator based on the decomposition of overall factor productivity into a pollution index and an input output efficiency index this indicator is compared to the more conventional jaggi and freedman 1992 model results are given for illustrative purposes using data from u s fossil fuel fired electric utilities the rankings of the utilities obtained with the two models show significant divergence which is due to the different ways in which the undesirable outputs are dealt with as well as due to the different possible tradeoffs between the pollutants released into the atmosphere and the resources used as inputs

investment in u s agriculture resource adjustment problems in u s agriculture are motivated against the background of the farm problem the adjustment cost hypothesis is invoked to specify and estimate consistently a system of dynamic investment demand and output supply equations by utilizing recent advances in dynamic duality theory the investment demand equations assume the form of a multivariate flexible accelerator results indicate that labor capital services and land exhibited quasi fixity while intermediate materials were a variable factor this can be construed as a form of asset fixity within aggregate u s agriculture the univariate flexible accelerator hypothesis is rejected

what to value and how ecological indicator choices in stated preference valuation the ecological literature accepts that many policy outcomes cannot be observed directly and must be characterized using indicators multiple indicators can often be used to communicate similar ecological outcomes previous studies using alternative indicators in stated preference surveys suggest that welfare estimates may be indicator dependent casting doubt on whether welfare estimates are sufficiently reliable for cost benefit analysis we suggest that the reason for such indicator dependence may be that indicators used in these prior studies represented different outcomes valued by respondents this possibility underscores the need for greater attention to selection of indicators and their properties within stated preference survey design this paper develops a model introducing the concept of outcome equivalent indicators defined as indicators that provide alternative representations of identical underlying outcomes to assess empirically whether welfare estimates are indeed robust to indicator choice when alternative indicators are expected to be outcome equivalent we analyze data from a choice experiment estimating willingness to pay for migratory fish restoration in rhode island usa results demonstrate that welfare estimates are robust to the use of alternative ecological indicators within stated preference scenarios

testing the stochastic implications of the life cycle permanent income hypothesis using uk regional time series data this paper applies exclusion tests of the pure life cycle permanent income hypothesis lcpih to time series data on each of the eleven standard regions of the uk data are annual and extend from 1975 to 1994 the results obtained suggest that there are considerable differences in consumption behaviour across the regions theory has indicated that a departure of consumption behaviour from that predicted by the lcpih can occur because of a change in unemployment consequently a comparison is undertaken of the empirical results obtained for the eleven regions and the respective unemployment movements following this comparison it is possible to conclude that the contrasting unemployment experiences of the regions of the uk have contributed significantly to yet cannot account for fully the observed differences in consumption behaviour

can unobserved land quality explain the inverse productivity relationship abstract an inverse relationship between both farm productivity and labor intensity and farm size is a common empirical finding in developing country agriculture the traditional explanation has been imperfect labor markets recently it has been suggested instead that the inverse relationship is a statistical artifact resulting from omitted land quality using a farm level data set from java i investigate whether omitted variable bias can explain the inverse relationship i show that the inverse relationship and accompanying wage responses are inconsistent with a model of neoclassical farm behavior that ignores omitted variable bias instrumental variables techniques yield parameter estimates in which the inverse relationship is eliminated and the estimated wage elasticities are more in line with economic theory further econometric investigation hints that a model of omitted land quality may be a possible source of the inverse relationship these results emphasize the importance of considering the sources of cross sectional variation in estimating microeconomic relationships