sequential formation of coalitions in games with externalities and fixed payoff division this paper analyzes a sequential game of coalition formation when the division of the coalitional surplus is fixed and the payoffs are defined relative to the whole coalition structure gains from cooperation are represented by a valuation which maps coalition structures into payoff vectors i show that any core stable coalition structure can be attained as a stationary perfect equilibrium of the game if stationary perfect equilibria may fail to exist in general games a simple condition is provided under which they exist in symmetric games furthermore symmetric stationary perfect equilibria of symmetric games generate a coalition structure which is generically unique up to a permutation of the players a general method for the characterization of equilibria in symmetric games is proposed and applied to the formation of cartels in oligopolies and coalitions in symmetric majority games journal of economic literatureclassification numbers c78 c71 1996 academic press inc

u s bilateral trade flows and exchange risk during the floating period abstract this paper tests for real exchange rate risk effects on u s bilateral trade flows during the floating period using several new as well as previously used risk measures significant negative effects occur in five of six u s import flows and in two of six u s export flows with one export flow showing a significant positive effect these results are consistent with several previous findings for aggregate u s trade two risk measures using the forward exchange rate and assuming a time varying risk premium provide marginally more significant results than the others

secular and cyclical responses of u s trade to income an evaluation of traditional models in the three decades since guy orcutt s 1950 classic paper evaluating empirical research on international trade flows most trade research has focused on the influence of prices in the decade since the benchmark study by houthakker and magee 1969 examination of the role of prices has accelerated although income is consistently the most significant explanatory variable in these studies it is typically introduced only as a background control variable rather than as a variable of central interest the few explicit studies of the link from income to trade either use proxies such as delivery lags and inventory ratios to investigate the dynamics of the link e g gregory 1971 and artus 1973 or decompose income into trend deviation from trend and in one instance change in deviation from trend in an attempt to separate the secular and business cycle components e g ball eaton and steuer 1966 khan and ross 1975 and dunlevy 1980 stephen magee 1975 pp 188 193 211 214 provides a persuasive rationale for at least the spirit of the second line of research arguing that trade flows respond differently to secular and business cycle income changes and that regression estimates with income in level form mix these effects time domain decomposition is now an established practice with the trend response identified with secular forces like comparative advantage hence could be positive or negative in either demand or supply the deviation from trend response with a business cycle keynesian mechanism hence is likely to be positive in demand and negative in supply and the change in deviation from trend response with a sneed of adjustment constraint hence is likely to be negative the most recent evidence bearing on these issues is provided by dunlevy 1980 who finds that the effect of the business cycle income proxy deviation fromtrend income on the supply of exports for the united states and the united kingdom is positive rather than negative evidence contradicting both theory and evidence in earlier capacity pressure studies in this paper we first evaluate traditional regression estimates of income elasticities of demand and supply for u s imports and exports from 1955 to 1979 then compare these estimates to cross spectral estimates of the secular and business cycle responses of trade to income the spectral technique is used because by definition the approach estimates separately the secular and business cycle links between trade and income if the response of trade to movements in income does differ over cycles regression estimates of income elasticities may reflect bias and instability due to cycle varying parameters regression elasticity estimates with income in trend and deviation from trend forms do provide separate estimates but the decomposition is useful only to the degree that the two variables are accurate proxies for secular and business cycle movements in income it should be emphasized that we are not using spectral analysis to detect lead lag properties since these are more directly obtained in the time domain and are relatively trivial for our sample the unique advantage of spectral analysis is that it isolates secular and business cycle components directly even when the time domain link is only contemporaneous the paper is organized as follows section ii presents and evaluates time domain estimates of standard demand and supply equations for u s imports and exports and presents caveats regarding interpretation of the trend and deviationfrom trend income variables section iii proreceived for publication march 4 1981 revision accepted for publication may 12 1982 university of oregon an earlier draft of this paper was presented at the fall 1980 north american meeting of the econometric society we acknowledge helpful comments from s y kwack john mutti and two anonymous referees we also thank john pippenger for supplying the spectral program specx68 and the university of oregon for a faculty research grant remaining errors are solely ours i application of spectral methods to investigate trade income links was first suggested by ball eaton and steuer 1966 p 503 they were unable to use the technique however because the data series available at that time were too short

how reliable are simple single equation specifications of import demand this paper examines nine models of aggregate import demand for each of five countries canada germany japan united kingdom and united states in an attempt to determine which of the frequently used single equation models of import demand are appropriate an appropriate model is defined as one which generates unbiased or at least consistent and efficient elasticity estimates while models without lagged adjustments and almon lag models perform rather poorly according to these criteria models including dynamic behavior through lagged values of the dependent variable are frequently accepted results are reported regarding functional form measures of variables and structural shift economists have devoted considerable attention to the estimation of aggregate import demand elasticities because of their importance in trade theory the simplest procedure for estimating these elasticities which is consistent with economic theory is to assume that the elasticity of supply of imports is infinitely elastic and to estimate

a theory of endogenous coalition structures consider an environment with widespread externalities and suppose that bind ing agreements can be written we study coalition formation in such a setting our analysis proceeds by defining on a partition function an extensive form bargaining game we establish the existence of a stationary subgame perfect equilibrium for such a game our main results are concerned with the characterization of equilib rium coalition structures we develop an algorithm that generates under certain conditions an equilibrium coalition structure our characterization results are especially sharp for symmetric partition functions in particular we provide a uniqueness theorem and apply our results to a cournot oligopoly journal of economic literature classification numbers c71 c72 c78 d62 q 1999 academic press

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

confronting the environmental kuznets curve t he environmental kuznets curve posits an inverted u relationship between pollution and economic development kuznets s name was apparently attached to the curve by grossman and krueger 1993 who noted its resemblance to kuznets s inverted u relationship between income inequality and development in the first stage of industrialization pollution in the environmental kuznets curve world grows rapidly because people are more interested in jobs and income than clean air and water communities are too poor to pay for abatement and environmental regulation is correspondingly weak the balance shifts as income rises leading industrial sectors become cleaner people value the environment more highly and regulatory institutions become more effective along the curve pollution levels off in the middle income range and then falls toward pre industrial levels in wealthy societies the environmental kuznets curve model has elicited conflicting reactions from researchers and policymakers applied econometricians have generally accepted the basic tenets of the model and focused on measuring its parameters their regressions typically fitted to cross sectional observations across countries or regions suggest that air and water pollution increase with development until per capita income reaches a range of 5000 to 8000 when income rises beyond that level pollution starts to decline as shown in the conventional ekc line in figure 1 in developing countries some policymakers have interpreted such results as conveying a message about priorities grow first then clean up numerous critics have challenged the conventional environmental kuznets curve both as a representation of what actually happens in the development process and as a policy prescription some pessimistic critics argue that crosssectional evidence for the environmental kuznets curve is nothing more than a

optimal growth when tastes are inherited we address the issue of optimal growth when standard of living aspirations are transmitted from one generation to the next we derive the condition for the optimal solution to be stable in the saddle point sense and show that this optimal solution may display damped oscillations even when the planner does not discount the utility of future generations golden rule case the decentralization of the optimal solution aims at correcting the inter generational externality by use of an investment subsidy and allows to avoid socially damaging rushes on consumption in expansion periods it also allows to stabilize output in the case of competitive economies displaying endogenous fluctuations

the dynamics of bequeathed tastes if children inherit life standard aspirations from their parents then their savings are affected and cycles may appear in overlapping generations olg models with production at some point of an expansion aspirations grow faster than wages savings decrease and a contraction begins

the economic lives of the poor in what turned out to be a rhetorical master move the 1990 world development report from the world bank defined the extremely poor people of the world as those who are currently living on no more than 1 per day per person measured at the 1985 purchasing power parity ppp exchange rate in 1993 the poverty line was updated to 1 08 per person per day at the 1993 ppp exchange rate which is the line we use in this paper poverty lines have always existed indeed 1 per day was chosen in part because of its proximity to the poverty lines used by many poor countries 1 however the 1 a day poverty line has come to dominate the conversations about poverty to a remarkable extent

optimal taxation when consumers have endogenous benchmark levels of consumption i examine optimal taxes in an overlapping generations economy in which each consumer s utility depends on consumption relative to a weighted average of consumption by others the benchmark level of consumption as well as on the level of the consumer s own consumption the socially optimal balanced growth path is characterized by the modi ed golden rule and by a condition on the intergenerational allocation of consumption in each period a competitive economy can be induced to attain the social optimum by a lump sum pay as you go social security system and a tax on capital income

extending renegotiation proofness to infinite horizon games abstract this paper extends the concept of a pareto perfect equilibrium to infinite horizon games and offers a definition that covers both finitely and infinitely repeated games an equilibrium is said to be pareto perfect if admitted by a pareto perfect social norm a pareto perfect norm admits an equilibrium if and only if it cannot be profitably renegotiated in a norm observing manner at a future contingency the defined concept is compared to concepts that other writers have proposed it departs from other concepts by insisting that nonviable equilibria be defeated through renegotiation by viable ones and by not imposing a stationarity assumption

coalition proof nash equilibria and the core in three player games abstract we study 3 person noncooperative games of coalition formation where the underlying situation is represented by a game in coalitional form without side payments we look at coalition proof nash equilibria and we show that if the underlying game is balanced in the sense of scarf then except for indifferences the grand coalition forms and the payoff is in the core if the underlying game has an empty core then only a two player coalition can form and the payoff to its members is given by the respective coordinates of a unique outside options vector if the underlying game is not balanced but has a nonempty core then either one of the two mentioned cases may hold

us bilateral trade equations forecasts and structural stability in this paper actual recent us trade values are compared with out of sample forecasts using a standard specification for real bilateral trade value equations though fairly accurate on average there are large bilateral errors a battery of coefficient stability tests indicates significant instability more often for imports over the forecast period and more often for exports over the latter part of the estimation period thus standard bilateral trade equations appear to violate the basic regression assumption of stability and may be of little use for forecasting

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

the effects of communication on the partnership solution to the commons organizing individual appropriators into output sharing groups has been found to effectively solve the tragedy of the commons problem we experimentally investigate the robustness of this solution by introducing different channels of communication that naturally arise from group competitions in the absence of communication we confirm that output sharing can introduce sufficient free riding to offset over harvesting and results in full efficiency allowing local communication within output sharing groups substantially decreases this efficiency enhancement because it reduces free riding and boosts between group competition yet the efficiency level is still significantly higher than that achieved when global communication is allowed among all appropriators in a conventional common pool resource without output sharing the efficiency reducing effect of local communication is mitigated when random partners instead of fixed partners are sharing output over time and is nearly eliminated when random partners are formed with users who belong to different communication groups

optimal tax schemes and the environmental externality abstract this paper analyzes optimal tax schemes in an overlapping generations model with the environment which deteriorated by the consumption to achieve the optimal allocation two sorts of consumption tax schemes are analyzed in addition we examine another tax scheme with the maintenance subsidy

endogenous aspirations growth and the rise of environmental concerns abstract in this paper we analyze the implications of assuming that the intensity of aspirations is endogenous in accordance with empirical evidence consumption aspirations decrease with capital accumulation while environmental ones increase we show that such a change in the intensity of aspirations gives rise to a u shaped relationship between capital accumulation and environmental quality we also study the implications of our assumption concerning the optimal allocation and show that the steady state capital stock can be larger or smaller than the one corresponding to the modified golden rule in addition for realistic parameter values the decentralization of the optimal allocation requires the implementation of a maintenance investment subsidy and a lump sum transfer from the old to the young generation

u s bilateral trade balances and the dollar abstract u s bilateral export and import values with seven large trading partners are tested for real exchange rate effects over 1975 1985 the results suggest that dollar devaluation would have the most favorable impact on the u s trade balance in the case of japan and the least favorable in the case of canada

a noncooperative theory of coalitional bargaining the authors explore a sequential offers model of n person coalitional bargaining with transferable utility and with time discounting their focus is on the efficiency properties of stationary equilibria of strictly superadditive games when the discount factor delta is sufficiently large it is shown that delay and the formation of inefficient subcoalitions can occur in equilibrium the latter for some or all orders of proposer however efficient stationary equilibrium payoffs converge to a point in the core as delta approaches one strict convexity is a sufficient condition for there to exist an efficient stationary equilibrium payoff vector for sufficiently high delta

intergenerational altruism and the environment we construct an overlapping generations model of pollution externality in which individuals are altruistically linked to their offspring as in barro 1974 it is shown that steady state consumption may be a decreasing function of the intergenerational degree of altruism despite individuals altruism the competitive equilibrium is not optimal we thus study the social optimum and show that it can be decentralized

who compares to whom the anatomy of income comparisons in europe this article provides unprecedented direct evidence from large scale survey data on both the intensity how much and direction to whom of income comparisons income comparisons are considered to be at least somewhat important by three quarters of europeans they are associated with both lower levels of subjective well being and a greater demand for income redistribution the rich compare less and are happier than average when they do which latter is consistent with relative income theory with respect to the direction of comparisons colleagues are the most frequently cited reference group those who compare to colleagues are happier than those who compare to other benchmarks

aspirations habit formation and bequest motive we analyze how the presence of endogenous preferences affects the altruistic bequest motive from parents to children we will show that the existence of habits raises the threshold value of the intergenerational discount factor above which altruistic bequests are positive while aspiration formation could push this value down therefore the dynamic inefficiency of the economy with no altruism is not sufficient to prevent the bequest motive from being operative under aspiration formation we also discuss the implications of public debt when the bequest motive is inoperative and preferences exhibit habit and aspiration formation

an overlapping generations model of growth and the environment this article analyzes the potential conflict between economic growth and the maintenance of environmental quality in an overlapping generations model short lived individuals make decisions which have long lasting effects on both factor productivity and the environment the model provides a theoretical explanation of observed correlations between environmental quality and income whereby economic growth is associated first with declines then improvements in environmental quality it suggests circumstances in which multiple pareto ranked steady state equilibria may arise and in which sustained growth of both capital and environmental quality may occur overmaintenance of the environment analogous to dynamically inefficient overaccumulation of capital may emerge copyright 1994 by royal economic society