interpreting economic time series this paper explores some of the implications for econometric practice of the principle that people s observed behavior will change when their constraints change in dynamic contexts a proper definition of people s constraints includes among them laws of motion that describe the evolution of the taxes they must pay and the prices of the goods that they buy and sell changes in agents perceptions of these laws of motion or constraints will in general produce changes in the schedules that describe the choices they make as a function of the information that they possess until very recently received dynamic econometric practice ignored this principle the practice of dynamic econometrics should be changed so that it is consistent with the principle that people s rules of choice are influenced by their constraints this is a substantial undertaking and involves major adjustments in the ways that we formulate estimate and simulate econometric models

import demand with rational expectations estimates for bauxite cocoa coffee and petroleum abstrac t we offer a method for establishing the distributed lag structure in import demand models a priori we consider a firm which imports raw materials in a world of uncertainty traditional considerations of adjustment and inventory holding costs lead to a forward looking import decision rule linear rational expectations modelling allows us to transform the forward looking rule into a finite distributed lag specification while the resulting model is similar in form to earlier empirical models it is not subject to the lucas critique the model is fitted to u s data over the period 1954 1980

learning in expectation formation with applications to cattle and beef exports the paper briefly considers problems associated with rational expectations and formulates a more general model which allows for situations where economic agents do not immediately arrive at a fully rational solution it incorporates a learning mechanism whereby agents can provisionally adopt hypothetically derived expectations as a basis for comparison with the actual outturns utilizing the resultant past expectational errors as indicators of the likelihood of prospective future outcomes agents make explicit allowance a rational solution thus in situations where complete information is not freely available rationality would be approximated over time by means of a dynamic learning process which is founded on a firm empirical approach this essential empiricism requires that the problem be examined on the basis of direct observation of applied situations therefore the method is implemented and analysed with reference to irish foreign trade in fat cattle carcase and processed beef simultaneous equati

rational expectations in agricultural economics research and policy analysis despite recognition by agricultural economists that price expectations are important in agricultural decision making few changes in the way price expectations appear in economic models of agriculture have been made during the past two decades for example in the major proportion of existing supply response studies it has been assumed that price expectations are formed adaptively for an illustration of the extent that this assumption has been used see askari and cummings that is expected price is assumed to be a weighted average of past prices with the weights declining geometrically over time in other supply response studies it is assumed that a polynomial distributed lag on product prices provides an adequate representation of the system s dynamic structure see for example meilke zwart martin or fisher however as muth p 315 noted there is little evidence to suggest that the presumed relations bear a resemblance to the way the economy works although data on anticipations are collected in many ways only a few studies have tried to determine how individual decision makers actually form expectations heady and kaldor turnovsky and fisher and tanner katona in calling for more research of this kind also identifies some difficulties in studying the psychology of individuals learning processes until psychologists make more progress in this area economists who incorporate anticipations in their models will have to use another approach however there are few choices the popular adaptive expectations hypothesis is inadequate not because it implies that the forecast of a particular variable is a distributed lag of its own past values but because it implies that the distributed lag parameters are restricted in an ad hoc way in general assuming that price expectations are formed adaptively is ad hoc because the parameter restrictions in the distributed lag are not the result of an optimization process alternative formulations such as the assumption that expectations are naive or generated by some other simple autoregressive form are inadequate for similar reasons the rational expectations hypothesis

the cost of carbon abatement through community forest management in nepal himalaya this paper estimates the economic returns to carbon abatement through biological sequestration in community managed forest under future redd policy and compares these for three possible management scenarios for the estimation the research relies on forest inventory data together with other socio economic and resources use data collected from forest users in three sites of nepal himalaya the paper estimates the incremental carbon from forest enhancement on a yearly basis over a five year period using the value of 1 and 5 per tco2 for conservative analysis the results based on the three sites indicate that community forest management may be one of the least cost ways to abate carbon with a break even price under scenario 2 which ranges from 0 55 to 3 70 per tco2 however bringing community forests into the carbon market may entail high opportunity costs as forests provide numerous non monetary benefits to the local population who regard these as the main incentive for conservation and management an important finding of the research is that if forest resources use by local communities is not permitted then carbon trading will not be attractive to them as revenue from carbon will not cover the cost foregone by not harvesting forest resources

price and income elasticities of disaggregated import demand results from uecms and an application this paper presents an empirical analysis of the demand for maize milk powder butter and rice imports in cyprus using annual time series data covering the period 1975 1994 none of these products is produced in cyprus and all the necessary quantities are imported to meet domestic demand the primary objective of the paper is to derive long run price and income elasticities of import demand that can be used to analyse the impact of various policies such as the adoption of the common agricultural policy cap when and if the republic of cyprus joins the european union eu in so doing the paper takes on board some recent developments in time series econometrics the cointegration test used the bounds test is a recent test and is based on the estimation of an unrestricted error correction model uecm parsimonious models were derived using hendry s general to specific approach the estimated elasticities were subsequently used to quantify some of the implications for cyprus had the cap been ope

does ecological economics have a future contradiction and reinvention in the age of climate change abstract this paper addresses the role of neoclassical methodologies in ecological economics and the contradictions these methodologies pose to the field s critical founding principles we first consider robert costanza s treatment of nicholas stern s global deal and then survey climate change related articles published in this journal over the past five years this survey reveals how mainstream neoclassical methodologies dominate discourse and do so by marginalizing more critical political economy analyses this situation imperils the field s founding vision of a no growth steady state it also fails to address the related growth dynamics of capitalism without such a critical treatment the field s formal embrace of methodological pluralism actually entails an ideological empiricism that renders ecological economics theoretically incoherent this situation undermines the field s historical promise as an alternative economic paradigm ecological economics now faces a problematic future its survival in a form faithful to its founding vision will require an explicit choice to address its internal contradictions and reinvent itself in ways relevant to our contemporary context without such a choice ecological economics will likely succumb to an implicit acceptance of the hegemony of mainstream economic methodologies and their pro growth imperatives

rural works programs in india costs and benefits abstract a sequential applied general equilibrium model of the indian economy is used for analyzing the costs and benefits of a rural works program designed to provide employment during slack agricultural seasons through the creation of productive assets such as roads irrigation works schools etc it is shown that such a program if carried out efficiently targeted effectively and financed in a way that does not jeopardize long term growth can be a very effective instrument for alleviating rural poverty in india

granger causality and the time series analysis of political relationships political scientists have employed causal modeling techniques for quite some time in most cases however they have relied on methods of a static cross sectional variety time series methods have been disseminated and applied but these have not been expressly causal the problem of assessing the causal character or direction of political relationships over time has not been addressed granger 1969 has suggested a notion of causality that is applicable in longitudinal analysis the study and application of granger s idea of causation now is widespread in economics and business this discussion evaluates the usefulness of applying granger causality in the study of political relationships granger s definition of causality is introduced several popular procedures for assessing granger causality are reviewed and certain problems surrounding interpretation of those empirical tests are elucidated the virtues and pitfalls of granger causal analysis then are illustrated in an analysis of an important topic in international political economy and also in a reanalysis of a recent granger causal investigation of arms races

vector rational error correction abstract systems of forward looking linear decision rules can be formulated as vector rational error correction models the closed form solution of the restricted error corrections is derived and a full information estimator is suggested the error correction format indicates that the assumptions of convex adjustment costs and rational expectations impose different types of a priori restrictions on the dynamic structure of the error corrections an empirical model of the producer decision rule for capital investment illustrates that the data rejects dynamic restrictions imposed by a standard model of adjustment costs but supports a more general description of convex frictions

how has microcredit supported agriculture evidence using panel data from bangladesh improving agricultural productivity has received a greater attention in recent years amid concerns about rising food insecurity population pressures and climate change many believe that better access to institutional credit spanning microcredit as well as commercial and agricultural banks can help rural households smooth risks and access inputs and other technology to modernize agriculture and improve farm nonfarm linkages we use recently augmented household panel data spanning over 20 years in bangladesh to examine the effects of rural credit expansion both microcredit and formal bank channels on outcomes for agricultural households we find that microcredit has benefited households with lower landownings raising agricultural income from activities such as livestock rearing that require less land as well as nonfarm income diversification for all households but with the strongest effect for landless or near landless households we do not find effects of microcredit on crop income but do however find that reported supply side credit constraints significantly lower crop income borrowing by both men and women has contributed to nonfarm income growth for marginal farmers but only men s borrowing has contributed to nonfarm income growth among higher landowning groups

testing dynamic specification for import demand models the case of cotton error correction models impose few prior restrictions on dynamic model specification and allow the data to determine model structure despite this obvious advantage few applications have adopted the error correction model to explain trade flows an error correction model of cotton import demand is estimated for france japan and hongkong a variety of tests are applied to determine the dynamic structure of the model it is found that the most general models are those that best fit the data for cotton import demand long run elasticities from these general models are significantly different than elasticities derived from a comparable static model

the conquest of south american inflation we infer determinants of latin american hyperinflations and stabilizations by using the method of maximum likelihood to estimate a hidden markov model that assigns roles both to fundamentals in the form of government deficits that are financed by money creation and to destabilizing expectations dynamics that can occasionally divorce inflation from fundamentals levels and conditional volatilities of monetized deficits drove most hyperinflations and stabilizations with a notable exception in peru where a cosmetic reform of the type emphasized by marcet and nicolini occurred

adjustment costs and import demand behavior evidence from canada and the united states abstract in this paper we examine whether adjustment costs are a significant source of the observed sluggish adjustment of canadian and us import demand we use a simple model of a utility maximizing domestic consumer under the assumption of integrated forcing variables to examine the importance of adjustment costs this formulation of the problem allows us to exploit the recently developed theory of cointegration to estimate the structural parameters of the model using a two step methodology moreover the formulation incorporates an element of forward looking behaviour into the decision process a feature that is important if one assumes adjustment costs are a significant source of persistence in import demand adjustment the empirical results from a euler equation imply that adjustment costs in canada and the united states are important

a dynamic nash game model of oil market disruptions and strategic stockpiling in this paper we present and analyze a nash dynamic game model for investigating public and private sector oil inventory policies in unstable world oil markets conceptual results about the model include simple verifiable conditions for uniqueness and stability of solutions along with characterizations of optimal policies we also present results and discuss computational issues that arise in determining subgame perfect infinite horizon equilibria using a steady state policy iteration approach

rational expectations and the smoothing properties of inventories of finished goods abstract this paper formulates and estimates a dynamic rational expectations equilibrium model of inventories of finished goods and employment of labor the view that the primary role of inventories of finished goods is to act as a buffer stock in the face of fluctuating demand is examined both the model and estimation results indicate that this is the case because of differences in the costs involved for firms in changing their inventory stocks and labor force in addition to providing some new evidence on the behavior of inventories of finished goods and employment the paper illustrates a technology for maximum likelihood estimation of structural parameters under the hypothesis of rational expectations

the rural non farm sector issues and evidence from developing countries abstract the rural non farm sector has traditionally been viewed as a low productivity sector which produces low quality goods it is often expected to wither away as a country develops recent years have seen a shift away from this position towards recognition that the rural non farm sector can and often does contribute to economic growth rural employment poverty reduction and a more spatially balanced population distribution this paper reviews the literature on the conceptual and empirical underpinnings of this more recent perspective focussing on the experience in developing countries the paper documents the size and heterogeneity of the sector pointing to evidence that in many countries the sector is expanding rather than declining the issues associated with measuring the sector s economic contribution are discussed followed by empirical assessments for several countries and regions the distributional impact of non farm earnings is examined and it is found that a pro poor impact while by no means inevitable can be considerable the sector s trajectory over time in different settings is reviewed and the scope for and experience of various policy interventions is discussed

why has economic growth been more pro poor in some states of india than others abstract we use 20 household surveys for india s 15 major states spanning 1960 1994 to study how the sectoral composition of economic growth and initial conditions interact to influence how much growth reduced consumption poverty the elasticities of measured poverty to farm yields and development spending did not differ significantly across states but the elasticities of poverty to urban and rural non farm output varied appreciably and the differences were quantitatively important to the overall rate of poverty reduction states with higher elasticities did not experience higher rates of non farm growth the non farm growth process was more pro poor in states with initially higher literacy higher farm productivity higher rural living standards relative to urban areas lower landlessness and lower infant mortality

the ineffectiveness of effective tax rates on business investment a critique of feldstein s fisher schultz lecture abstract in his fisher schultz lecture martin feldstein 1982 examined the effects of non neutral tax rules on business investment by estimating three econometric models and he concluded that the rising rate of inflation has because of the structure of existing u s tax rules substantially discouraged investment in the past 15 years in a detailed examination of feldstein s effective tax rate model and a less extensive review of his other formulations neoclassical and return over cost we advance a number of important and independent criticisms and find that these three models fail to support feldstein s conclusion that taxes have exerted a significantly depressing effect on net investment during the recent inflation episode

bilateral trade elasticities this paper estimates income and price elasticities for bilateral world trade in addition to testing the properties of the error terms the dynamic specification and the assumption of parameter constancy the analysis presents the first application of the bank spectrum estimator to bilateral trade flows for all countries the paper finds that bilateral trade elasticities exhibit enough of a dispersion to suggest that the direction of trade is sensitive to changes in income and prices using the bilateral elasticities as raw data the analysis obtains the associated multilateral estimates and finds that they are both consistent with the literature and suitable to addressing questions involving multilateral trade but the evidence also reveals that sole reliance on multilateral elasticities conceals valuable information for both policy applications and empirical analyses of international trade copyright 1990 by mit press

how infrastructure and financial institutions affect rural income and poverty evidence from bangladesh the mechanisms by which the poor benefit from economic growth remain a topic of debate in development literature we address this issue in the context of rural bangladesh using a pooled dataset of three household panels between 1991 2001 expansion of irrigation paved roads electricity and access to formal and informal credit have through different veins led to higher rural farm and non farm incomes accounting for exogenous local agroclimatic endowments that explain a large part of the variation in the growth of infrastructure and credit programmes however this has not translated into substantial reductions in poverty for the poorest households

econometric policy evaluation note for successive values of the endogenous variables y with the x treated as deterministic forcing variables here 0 is a parameter vector and the et are random shocks lucas correctly observed that such a formulation is inconsistent with a view of agents as optimizers except in special cases in which the future is irrelevant to present decisions it makes no sense to think of agents as optimizing if they know that their budget constraints are liable to shift arbitrarily i e in a way which is not characterized probabilistically as government policy changes lucas was led to augment the foregoing equation by adding to the system a government policy function

the impact of group based credit programs on poor households in bangladesh does the gender of participants matter this paper estimates the impact of participation by gender in the grameen bank and two other group based micro credit programs in bangladesh on labor supply schooling household expenditure and assets the empirical method uses a quasi experimental survey design to correct for the bias from unobserved individual and village level heterogeneity we find that program credit has a larger effect on the behavior of poor households in bangladesh when women are the program participants for example annual household consumption expenditure increases 18 taka for every 100 additional taka borrowed by women from these credit programs compared with 11 taka for men

the dynamic behavior of business loans and the prime rate abstract the purpose of this research is to determine the relevant variables channels of influence and dynamics characterizing the business loan market to achieve this goal the statistical approach of vector autoregressive time series analysis popularized by sims 1980 1981 and litterman 1979 is applied to a group of variables suggested by the portfolio and liability allocation problems of a representative bank and a representative business firm the variance and historical decomposition analyses suggest that innovations in the level of business inventories and commercial bank financial assets are the most important casual variables in the business loan market

distributed lags and intermediate good imports abstract in this paper we draw upon some recent developments in the theory of dynamic economics and econometrics to characterize the time series behavior of intermediate good imports it is shown that adjustment costs delivery lags and inventory holding costs considerations lead to distributed lag import demand functions that are not subject to the nerlove 1972 and lucas 1976 critiques of ad hoc and fixed distributed lag modelling

dynamic firm behavior and regional deadweight losses from a u s oil import fee this paper analyzes the national and regional efficiency aspects of a 5 per barrel fee on crude oil imported into the united states the emphasis of the paper is twofold firstly a dynamic model of firm behavior capturing explicitly both expectations formation and resource nonrenewability is used to assess the impact of the fee on domestic firm behavior and secondly the regional breakdown of the producer and consumer surplus changes tariff revenues and deadweight losses or gains is performed by taking explicit account of stock ownership in oil producing and oilconsuming corporations and consumption by end use sector the import fee is a politically contentious issue but one that refuses to go away in political circles the perceived benefits of the fee are usually seen as increased energy security and aid to a beleaguered domestic oil and gas industry perceived drawbacks are usually inflation and regional inequities the last point is the political downfall of the tariff producing states are seen to gain from the higher prices brought on by the tariff and consuming states are seen to lose representatives from states with little or no production and this of course covers most states are hard pressed to sell the idea to constituents this paper thus deals with two of the most important questions from a policy perspective the regional incidence of the tariff and its impact on domestic output in a related paper 20 i discuss the economic rationales for an oil import fee i find that any optimal tariff arguments based on u s monopsony power in the world oil market are not valid in today s market estimates show an import supply curve of approximately infinite elasticity and thus an optimal tariff near zero i dispense with the energy security rationale for a tariff as well arguing that any risk of a disruption of imports in the future and that risk may be small in today s market is best handled with other policy tools such as government owned or subsidized stockpiles these conclusions imply that a tariff would impose deadweight losses on the u s economy by encouraging overproduction of domestic petroleum resources and underconsumption of petroleum imports how much overproduction results from the tariff is the focus of section ii below a

earnings mobility and measurement error a pseudo panel approach the degree of mobility in incomes is often seen as an important measure of the equality of opportunity in a society and of the flexibility and freedom of its labor market but estimation of mobility using panel data is biased by the presence of measurement error and non random attrition from the panel this paper shows that dynamic pseudo panel methods can be used to consistently estimate measures of absolute and conditional mobility in the presence of non classical measurement errors these methods are applied to data on earnings from a mexican quarterly rotating panel absolute mobility in earnings is found to be very low in mexico suggesting that the high level of inequality found in the cross section will persist over time however the paper finds conditional mobility to be high so that households are able to recover quickly from earnings shocks these findings suggest a role for policies which address underlying inequalities in earnings opportunities

socioeconomic impacts of public forest policies on heterogeneous agricultural households nepal has a long history of returning public forests to local people as part of its community forestry programme in principle the community forestry programme is designed to address both environmental quality and poverty alleviation however concern has been expressed that forest policies emphasise environmental conservation and that this has a detrimental impact on the use of community forests in rural nepal where households require access to public forest products to sustain livelihoods to study the effect of government policies on forest use an economic model of a typical small community of economically heterogeneous households in nepal was developed the model incorporates a link between private agriculture and public forest resources and uses this link to assess the socioeconomic impacts of forest policies on the use of public forests socioeconomic impacts were measured in terms of household income employment and income inequality the results show that some forest policies have a negative economic impact and the impacts are more serious than those reported by other studies this study shows that existing forest policies reduce household income and employment and widen income inequalities within communities compared to alternative policies certain forest policies even constrain the poorest households ability to meet survival needs the findings indicate that the socioeconomic impacts of public forest policies may be underestimated in developing countries unless household economic heterogeneity and forestry s contribution to production are accounted for the study also demonstrates that alternative policies for managing common property resources would reduce income inequalities in rural nepalese communities and lift incomes and employment to a level where even the poorest households could meet their basic needs