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

aggregate investment and consistent intertemporal technologies it is frequent practice to model an industry or economy as if it were a single agent solving a single optimization problem a model of firm behavior which has had extensive use as an aggregative model is the adjustment cost model of investment we assume there are a number of competitive firms in an industry that choose investment paths to maximize their present value the technologies of the firms exhibit capital stock adjustment costs for general concave technologies of the firms there is no aggregate concave technology that can represent the technological possibilities available to the industry we find conditions on the technologies of the firms that are necessary and sufficient for the existence of an aggregate technology that can consistently model the industry s behavior and discuss their empirical implications

assessing demand artifacts in consumer research an alternative perspective in a recent insightful article on demand artifacts in consumer research t a shimp e m hyatt and d j snyder using a 1989 article by j j kellaris and a d cox as backdrop provided an appraisal of demand artifacts in this article we critically evaluate some of the assumptions and conclusions of shimp et al s analysis of the extent to which demand artifacts might explain the 1982 results of g j gorn as analyzed by kellaris and cox in addition we offer some useful suggestions for minimizing demand problems

sensitivity analyses of anomalies in developed stock markets abstract the literature on anomalies in developed stock markets produces no consensus on specification this study uses extreme bound analysis eba to evaluate the robustness of 15 stock return anomalies given data covering 16 developed markets from may 1984 to march 1999 two factors are sturdy according to the extreme decision rule in the panel design d p and momentum under a less stringent eba criterion long run lagged returns country risk and the january effect are also robust time series eba for individual markets produces one robust result according to relaxed decision rules across a majority of cases long run government bond yields

smooth trading with overconfidence and market power we describe a symmetric continuous time model of trading among relatively overconfident oligopolistic informed traders with exponential utility traders agree to disagree about the precisions of their continuous flows of gaussian private information with enough disagreement an equilibrium exists in which prices reveal the average of all traders signals immediately but traders continue to trade gradually towards target inventories the price is a linear function of a trader s inventory the derivative of a trader s inventory and the average other traders valuations prices reflect a keynesian beauty contest faster than equilibrium trading generates flash crashes jel d8 d43 d47 g02 g14

a critique of darley and lim s alternative perspective this reply challenges w k darley and j s lim s conclusions that an earlier article of ours misleads consumer researchers about the role and treatment of demand artifacts and that our analysis regarding g j gorn s experiments are flawed we also question darley and lim s proposals for minimizing demand artifacts

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

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

expectations and arms races recent empirical studies of arms races have produced two puzzling results first for several important arms races particularly the u s ussr case there appears to be no interaction arms acquisition appears to be driven only by internal factors second in several cases nations appear to be responding to the current military expenditures of their opponent this statistical result presents interpretation problems since nations do not know the current defense expenditure of their opponent at the time that they make their own military expenditure decision a number of interpretations for these results have been provided they include inappropriate model specification inappropriate operationalization of military threat and error ridden military expenditure data nevertheless the results persist and conflict with our more substantive and intuitive understanding of arms processes a process based upon expectations of current arms expenditures of the opponent is developed to deal with this puzzle in this paper several alternative expectation mechanisms are formulated and tested for a number of contemporary arms races

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

agents as empirical macroeconomists thomas j sargent s contribution to economics thomas j sargent has fundamentally changed and in the words of art rolnick who interviewed him in 2010 irrevocably transformed the field of macroeconomics whether as sole author as co author with collaborators as an author influenced by others or as a teacher of the profession influencing others this paper is about his contribution to our field the nobel memorial prize to thomas j sargent and christopher a sims has been awarded for the empirical research on cause and effect in the macroeconomy or more broadly for macroeconometrics one often likes to distinguish between theorists on the one hand and empiricists and econometricians on the other thomas j sargent holds a unique position in between a key theme in a large part of his work has been to put the agents in his model on equal footing with the econometrician who is observing data from the model i e to assume that agents are themselves empirical macroeconomists or macroeconometricians in this paper i use this theme to examine his work and his contributions to the study of economics

comovements in aggregate and relative prices some evidence on neutrality abstract this paper develops an alternative test of the neutrality of anticipated monetary policy a multi good equilibrium model along the lines of barro and hercowitz is used to derive a neutrality proposition for anticipated movements in the aggregate price level and to demonstrate its equivalence econometrically to the exogeneity of relative prices with respect to the aggregate price level multivariate causality tests provide a basis for testing these restrictions the empirical results provide mixed evidence for the equilibrium models while the variation in the findings across industries suggests a role for supply side disturbances in explaining comovements in aggregate and relative prices

short run fluctuations in fertility and mortality in pre industrial sweden abstract this paper describes and interprets annual swedish data from 1750 to 1869 on weather harvests real wages birth rates and death rates using vector autogression impulses due to unexplained increases in wealth whether this occurred through increased real wages improved agricultural yields or warmer winters led in the short run to increased fertility and decreased infant and non infant mortality and hence to increased rates of population growth unexplained or unanticipated fluctuations in infant mortality led to replacement cycles in fertility within one to three years although only a negligible cumulative effect on fertility persisted after five to ten years fluctuations in deaths among persons older than one year evoked a fertility response several years later but this replacement response persisted after more than a decade although vector autoregression is not designed to account for long term trends and their consequences the interrelationships found here among exogenous weather shocks and fluctuations in economic conditions and demographic rates provide support for the homeostatic mechanisms hypothesized by classical economists and discussed by malthus the methodology of vector autoregression appears useful for studying historical series on climatic economic and demographic variables where we do not yet have a sufficient theoretical foundation for specifying and estimating structural models

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

on the risk of stocks in the long run a resolution to the debate in response to the ongoing debate in this journal about whether the risk of investments in the stock market is increased or decreased by lengthening the investment period we show that bodie s attempt to identify market risk with the price of put options leads to a circular argument within the workings of arbitrage free option pricing models thus bodie failed to rebut the conventional view that longer investment horizons may be thought of as less risky bodie s put option prices are relevant however to determining market prices of stock investment insurance

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

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

investments with downside insurance and the issue of time diversification of two insurance policies that guarantee the same minimum rate of return on a portfolio and differ only in their time horizons which is riskier this study shows that if the minimum rate is lower than the risk free rate and if the risk is measured by the cost of insurance then the degree of risk is not a monotonic function of the policy s time horizon for every positive level of concession rate defined as the risk free rate minus the insured rate the cost of such insurance peaks at a finite time horizon this peak cost horizon is typically between 5 and 15 years the higher the concession rate or the lower the volatility of the insured portfolio the shorter this peak cost time horizon is thus although a 5 year insurance policy can be much riskier than a 1 year policy it can also be riskier than a 30 year policy

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

tobin s q and financial policy abstract recent research in macroeconomics has emphasized the importance of linking the financial and real sectors and working with optimizing models tobin s q model of investment would appear to provide a framework satisfying these two criteria in contrast to the original presentation of the q model the formal development has not recognized that the firm actively participates in a number of financial markets in this broader context q may be an uninformative and possibly misleading signal for investment expenditures we then endeavor to turn this negative theoretical result to positive advantage in resolving a number of empirical problems with q models

the impact of bad writing in economics we find significant style differences between articles written by economists for their professional journals and articles by the same economists in the wall street journal we find no evidence that style influences the professional success of economists which suggests that the private rewards to improving the quality of writing are low indeed each community of scholars has probably adopted a professionally correct writing style from which its members diverge little however scholars do alter their rhetorical style to communicate effectively with audiences other than the professional community this suggests that intra and inter group written communication by economists is efficient

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

time diversification definitions and some closed form solutions abstract we establish general conditions under which younger investors should invest a larger proportion of their wealth in risky assets than older ones in the finite horizon dynamic setting we show that such phenomenon known as time diversification can occur in the presence of human wealth guaranteed consumption or mean reverting stock returns we formalize two alternative notions of time diversification commonly confounded in the literature analytic solutions are provided for both time series and cross sectional forms of time diversification to our best knowledge this paper is the first to solve in closed form the hedging demand for a cara investor with inter temporal consumption and a finite horizon facing mean reverting expected returns our results indicate that horizon can have a significant effect on the portfolio demand of a cara investor due to inter temporal hedging

on the risk of stocks in the long run a comment diametrically opposite conclusions about stocks long term risk follow from bodie s methodology see financial analysts journal may june 1995 bodie s conclusion that stocks risk increases monotonically with the investment horizon is incorrect conventional wisdom about the long term risk of stocks has not been refuted

a critical appraisal of demand artifacts in consumer research especially since the publication of sawyer s instructive article on the topic consumer researchers have been concerned that demand artifacts significantly compromise the validity and generalizability of experimental findings in this article we provide an overview of the issues surrounding the demand artifacts controversy evaluate the preconditions for demand artifacts and offer a critique of suppositions about the consequences and appropriate control of demand artifacts kellaris and cox s critique of gorn s well known classical conditioning experiments provides the backdrop for much of the discussion

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

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

government support for economic agendas in developing countries a behavioral model abstract a behavioral model of the roles played by the key actors in the political system of a developing country is developed and experimented with to understand circular cause and effect relationships shaping government commitment to economic development agendas the model shows that an authoritarian government whether compassionate or otherwise will be unable to provide continued support for an economic agenda since its need to increase control will eventually take priority over the need to increase public welfare