purchasing power parity based on effective exchange rate and cointegration 25 ldcs experience with its absolute formulation abstract with the development of cointegration technique the purchasing power parity ppp theory has received renewed attention most studies have tested the theory by using data from developed countries dcs and some high inflation less developed countries ldcs they have mostly rejected its empirical validity in this paper we use the concept of effective exchange rate and quarterly data over 1973 1988 to examine the experience of 25 ldcs for most countries we found little empirical support for the ppp

the effects of devaluation on the trade balance a critical view and re examination of mile s new results abstract in a often cited article miles 1979 claims to have shown empirically the validity of the global monetarist proposition that devaluations do not affect the balance of trade this paper first uses mile s own framework of analysis to reveal serious deficiencies in his methodology and tests that cast doubt on the validity of his results in a respecified trade balance equation we show that devaluations do affect the trade balance in the traditionally predicted direction the pivotal difference between the two specifications arises from our inclusion of relative price effects and longer lag structure for the exchange rate variable

are shocks to real effective exchange rates permanent or transitory evidence from pacific island countries in this article we consider the stability of the real effective exchange rates for four pacific island countries using the lee and strazicich 2003a b unit root test which allows one to incorporate at most two structural breaks in the data series our main finding is that for papua new guinea and samoa exchange rates are stable implying that shocks will have a transitory effect on real effective exchange rates while for fiji and the solomon islands we find exchange rates to be unstable implying that shocks will have a permanent effect on real effective exchange rates

an adverse selection model of optimal unemployment insurance abstract we ask whether offering a menu of unemployment insurance contracts is welfare improving in a heterogeneous population we adopt a repeated moral hazard framework as in shavell and weiss 1979 supplemented by unobserved heterogeneity about agents job opportunities our main theoretical contribution is a quasi recursive formulation of our adverse selection problem including a geometric characterization of the state space our main economic result is that optimal contracts for bad searchers tend to be upward sloping due to an adverse selection effect this is in contrast to the well known optimal decreasing time profile of benefits in pure moral hazard environments that continue to be optimal for good searchers in our model

devaluation and the j curve some evidence from ldcs within the international trade literature it is not uncommon to find arguments about whether devaluation will improve the trade balance it is argued that the flows of goods respond only with time lags to changes in the exchange rate the j curve terrn is used to describe the movement over time of the trade balance it may deteriorate at first and improvement may come later this paper presents a method by which one could detect the existence of the j curve the method is applied to four developing countries the empirical evidence supports the pattern of movemnent described by the j curve a major policy option for a country facing a persistent balance of payments deficit is said to be devaluation of its currency within the international trade literature it is not uncommon to find arguments about whether devaluation will improve the trade balance or the balance of payments for example proponents of the elasticities approach describe the necessary and sufficient conditions for an improvement in the trade balance in terms of elasticities of demand and supply referred to as the marshall lerner condition while there is abundant empirical evidence to suggest that these conditions are indeed met at least for industrial countries there have been circumstances under which 2 devaluation has not been successful for example one might wonder why the u s trade balance deteriorated so much in 1972 despite the devaluation of the dollar in 1971 this unfavorable effect of devaluation on the trade balance is termed the j curve phenomenon received for publication august 23 1984 revision accepted for publication november 26 1984 the university of wisconsin milwaukee i would like to thank two anonymous referees for their valuable comments on the initial draft of this paper 1 proponents of the absorption approach e g alexander 1952 describe how devaluation may change the terms of trade increase production and switch expenditures from foreign to domestic goods thus improving the trade balance international monetarists argue that devaluation reduces the real value of cash balances and or changes the relative price of traded and nontraded goods thus improving both the trade balance and the balance of payments 2 for an cstimate of the elasticities see houthakker and magee 1969 and warner and kreinin 1983 the former study provides the elasticities estimates under fixed exchange rates and the latter under floating rates this content downloaded from 157 55 39 17 on wed 31 aug 2016 04 39 37 utc all use subject to http about jstor org terms

the j curve in the emerging economies of eastern europe devaluation or depreciation of a currency worsens the trade balance before improving it resulting in a j curve pattern a new definition of the hypothesis implies a short run deterioration combined with the long run improvement by using monthly data over the january 1990 june 2005 period from 11 east european emerging economies most of which are the new european union eu members or the eu candidate countries this article uses the bounds testing approach to cointegration and error correction modelling and finds empirical support for the j curve hypothesis in three countries of bulgaria croatia and russia the results have important implications for policymakers involved in economics in terms of using exchange rate policy as a policy device to achieve real convergence toward eu standards

why doesn t technology flow from rich to poor countries what determines the technology that a country adopts while there could be many factors the e ciency of the country s nancial system may play a signi cant role to address this question a dynamic contract model is embedded into a general equilibrium setting with competitive intermediation the ability of an intermediary to monitor and control the cash ows of a rm plays an important role in a rm s decision to adopt a technology can such a theory help to explain the

effects of exchange rate risk on exports crosscountry analysis abstract in this paper we investigate the effects of exchange rate uncertainty on the aggregate exports of 19 developed and 67 developing countries using cross sectional data exchange rate uncertainty is found to be detrimental to the exports of both developing and developed countries developed countries exports however are found to be less sensitive to exchange risk than that of developing countries furthermore within the developing countries those who fixed their exchange rates to one major currency were found to be subject to less risk than the other developing countries

computing multi period information constrained optima this paper presents a detailed theoretical derivation and justification for methods used to compute solutions to a multi period including infinite period continuum agent unobservedeffort economy actual solutions are displayed illustrating cross sectional variability in consumption and labour effort in the population at a point in time and variability for a typical individual over time the optimal tradeoff between insurance and incentives is explored and the issue of excess variability is addressed by consideration of the analogue full information economy and various restricted contracting regimes

determinants of international trade flows this paper models and estimates import demand and demand for export functions for 19 industrial countries although primary emphasis is placed on the period of generalized floating exchange rates 1972 through 1980 estimates are also provided for the fixed exchange rate years 1957 1970 thus making possible a comparison between the two eras aside from the conventional income and price variables the paper assesses the effect of variations in the exchange rate and in the expected exchange rate on real trade flows additionally it estimates an unrestricted lag structure of the effect of price and exchange rate variations on imports

a recursive formulation for repeated agency with history dependence abstract we present general recursive methods to handle environments where privately observed variables are linked over time we show that incentive compatible contracts are implemented recursively with a threat keeping constraint in addition to the usual temporary incentive compatibility and promise keeping conditions journal of economic literature classification numbers d30 d31 d80 d82

dynamic financial constraints distinguishing mechanism design from exogenously incomplete regimes we formulate and solve a range of dynamic models of constrained credit insurance that allow for moral hazard and limited commitment we compare them to full insurance and exogenously incomplete financial regimes autarky saving only borrowing and lending in a single asset we develop computational methods based on mechanism design linear programming and maximum likelihood to estimate compare and statistically test these alternative dynamic models with financial information constraints our methods can use both cross sectional and panel data and allow for measurement error and unobserved heterogeneity we estimate the models using data on thai households running small businesses from two separate samples we find that in the rural sample the exogenously incomplete saving only and borrowing regimes provide the best fit using data on consumption business assets investment and income family and other networks help consumption smoothing there as in a moral hazard constrained regime in contrast in urban areas we find mechanism design financial information regimes that are decidedly less constrained with the moral hazard model fitting best combined business and consumption data we perform numerous robustness checks in both the thai data and in monte carlo simulations and compare our maximum likelihood criterion with results from other metrics and data not used in the estimation a prototypical counterfactual policy evaluation exercise using the estimation results is also featured

breakthroughs deadlines and self reported progress contracting for multistage projects we study the optimal incentive schemes for multistage projects staged financing pervasive in both venture capital and research grants arises as a feature of the optimal contract the nature of progress plays an important role when progress is tangible incentives are provided through a series of deadlines and a reward scheme that decreases over time early progress in one stage gives the agent more time and funding to complete the next one when progress is intangible unverifiable progress reports are used despite the fact that the information in the report has no social value the optimal contract involves a soft deadline wherein the principal guarantees funding up to a certain date if the agent reports progress at that date then the principal gives him a relatively short deadline to complete the project if not then a probationary phase begins in which the project is terminated at a constant rate until progress is reported we explore the implications for welfare and optimal project design

bilateral j curve between india and her trading partners india a land of over one billion people and one of the newly emerging industrial powers in the world is going through a slow but steady metamorphism for centuries india has played a major role in the international trade it was not uncommon to see her ships carrying silk and spices across the arabian seas and bringing back machine made textile invasions of india first by mughals and latter by the british through the east india company were all trade oriented india s presence in the world trade is relatively small at this time but is gaining momentum after independence in 1947 india for a brief period experimented with socialism the five year plans were mainly focused towards building infrastructure and development of small scale agriculture based industries the industrial development even though extremely important for growth played a secondary role the foreign investment was encouraged but only in the selected sectors of the economy however threat of nationalization a large bureaucracy corruption lack of understanding of the indian business practices and the requirement that a major share holder must be an indian national discouraged foreign capital investment in india during 1991 1992 india adopted a policy of trade liberalization to attract foreign capital and to encourage non resident indians to invest in their home country government of india established a separate unit within the home ministry whose main function was to expedite processing of applications india also relaxed the requirement that a major partner be an indian national india provided export subsidies to the exporters in terms of cash as well as foreign exchange so that they could import machines and raw materials exports responded to the trade liberalization and increased from 44 041 crores of rupees in 1991 1992 to 141 603 crores in 1998 1999 where one crore is equivalent to ten million in us dollar terms at a current exchange rate of 42 48 rupees per dollar this translates to an increase from 10 37 billion to 33 34 billion over eight years india also anticipates that through a major increase in the information technology mainly software industry her exports will increase to 90 billion by 2005 the trade liberalization has been accompanied by changes in the monetary policies the inflation rate has been reduced from about 12 to 9 per year the interest rates have declined from 14 to 10 and the exchange rate has been allowed to respond to market forces as a result from 1991 1992 to 1998 1999 the rupee has declined from 19 62 rupees per dollar to 42 48 rupees per dollar by december 2000 rupee had further devalued to 46 25 per dollar with a hope that it will further boost india s exports and improve her trade balance however the impact of currency depreciation on the trade balance is not instantaneous indeed there is ample evidence in the literature that after currency depreciation the trade balance worsens in the short run before improving in the long run since this pattern of movement of the trade balance over time resembles the letter j magee 1973 labelled it the j curve phenomenon magee argued that after devaluation contracts that are in transit at old exchange rates dominate the short run response of the trade balance over time new contracts at new prices begin to exert their favourable impact at this stage elasticities may increase leading to an eventual improvement in the trade balance of course the delayed response could also be due to lags in the process of increasing the production of exportables junz and rhomberg 1973 have identified five lags namely recognition lags decision lags delivery lags replacement lags and production lags only after the realization of these lags the trade balance could improve early studies that tried to investigate the impact of currency depreciation on the trade balance relied upon estimating the marshall lerner condition the condition

impact of the terms of trade on the u s trade balance a reexamination the right conclusion could be that there is a strong connection between the spectral components with specified periods a possible economic interpretation could identify a strong long term in the sense of the specified periods connection between both series but that would still not allow us to say anything concerning the size and direction of the time delay between the two series for such an analysis we would have to at least consider the phase angles between the components because of the ambivalent meaning of the phase angle in relation to the direction and number of periods the final answer could come only from the time domain analysis however the fact that only spectral components with longer periods i e smaller frequencies show coherency suggests something else in order to influence the balance of trade the changes in the terms of trade should be durable enough mathematical formalization of this concept of durability would therefore be helpful i would propose that further research be done in this respect

multi period contracts between principal and agent with adverse selection abstract multi period contracts with adverse selection at the time of contracting are studied with risk neutrality and independent private information all inefficiency arises in the first period only with positive serial correlation inefficiency is more pervasive but declines over time

optimal dynamic capital budgeting i study optimal design of a dynamic capital allocation process in an organization in which the division manager with empire building preferences privately observes the arrival and properties of investment projects and headquarters can audit projects at a cost under certain conditions a budgeting mechanism with threshold separation of financing is optimal headquarters 1 allocate a spending account to the manager and replenish it over time 2 set a threshold such that projects below it are financed from the account while projects above are financed fully by headquarters upon an audit further analysis studies when co financing of projects is optimal and how the size of the account depends on past performance of projects

efficient allocations in dynamic private information economies with persistent shocks a first order approach this article studies efficient allocations in a dynamic private information economy with a continuum of idiosyncratic shocks that are persistent i develop a first order approach for this environment and show that the problem has a simple recursive structure that relies on only a small number of state variables making the problem tractable i find sufficient conditions that guarantee that the first order approach is valid to illustrate the first order approach i numerically compute the efficient allocations in a mirrleesean economy with productivity shocks that follow a random walk and verify the validity of the first order approach i show that persistent shocks create a new trade off where the social planner decreases the informational rent of the agent today at the cost of providing higher insurance in the future copyright 2013 oxford university press

optimal contract to induce continued effort we consider a basic model of a risk neutral principal incentivizing a risk neutral agent to exert effort to raise the arrival rate of a poisson process the effort is costly to the agent is unobservable to the principal and affects the instantaneous arrival rate each arrival yields a constant revenue to the principal the principal therefore devises a mechanism involving payments and a potential stopping time to motivate the agent to always exert effort we formulate this problem as a stochastic optimal control model with an incentive constraint in continuous time over an infinite horizon although we allow payments to take general forms contingent on past arrival times the optimal contract has a simple and intuitive structure which depends on whether the agent is as patient as or less patient than the principal toward future income this paper was accepted by manel baucells decision analysis

determinants of international trade flows the case of developing countries abstract the question of magnitude and the time path of the trade flows to changes in the exchange rates and to changes in the price level is of emitent practical importance to assess the above proposition a distributed lag structure is imposed on the relative prices and on the effective exchange rate as the determinants of trade flows then import and export demand functions are estimated for a sample of developing countries using the almon procedure the empirical findings appeared to sustain orcutt s early conjecture that trade flows adjust differently to different price stimuli more precisely it was found that imports and exports reactions were quicker and the total response time was shorter when an exchange rate rather than relative prices caused a change in international prices

repeated moral hazard with effort persistence abstract i study a problem of repeated moral hazard where the effect of effort is persistent over time each period s outcome distribution is a function of a geometrically distributed lag of past efforts i show that when the utility of the agent is linear in effort a simple rearrangement of terms in his lifetime utility translates this problem into a related standard repeated moral hazard the solutions for consumption in the two problems are observationally equivalent implying that the main properties of the optimal contract remain unchanged with persistence for illustration i present the computed solution of an example

asymmetric j curve evidence from industry trade between u s and u k previous research that assessed the impact of exchange rate changes on the trade balance between the u s and u k assumed the effects are symmetric in this paper we add to the literature on the

effects of exchange rate flexibility on the demand for international reserves abstract we incorporate a measure of exchange rate flexibility into the standard reserve demand equation and present empirical results for the 1976 1985 period which are consistent with the work of officer 1976 and frenkel and jovanovic 1981 indicating the existence of economies of scale and the demand for reserves

do devaluations improve the trade balance the evidence revisited do devaluations improve the trade balance the evidence revisited this paper reexamines the effectiveness of devaluation in trade balance adjustment the question is addressed in a framework which improves the previous empirical literature in several respects the evidence indicates that devaluations have been a successful tool in inducing trade balance adjustment in particular nominal devaluations are found to result in significant real devaluations that last for at least three years and the real devaluation induces significant trade flows that are distributed over a two to three year period the evidence comes from two different samples 1953 73 and 1975 84 involving twenty seven countries and sixty devaluation episodes 1 introduction do devaluations affect real magnitudes in particular the trade balance a devaluation may effect the trade balance through two channels devaluation of the real exchange rate and a direct effect on domestic absorption the traditional approach stresses the first channel a nominal devaluation is assumed to change the real exchange rate a relative price and thus improve competitiveness in turn if relative prices the terms of trade in a two country two good model affect the trade balance devaluation will be successful in the sense of improving the trade balance ceteris paribus the absorption effect becomes the sole or most important channel in the monetary approach in a world in which all goods and assets are perfect substitutes prices are exogenously given for the small country and wages and prices are flexible in both nominal and real terms a devaluation increases the price level by the same percentage the increase in the price level reduces real balances and thus domestic absorption dornbusch 1973 883 has argued that if such a real balance effect is not present then it might stand to reason that the effects of devaluation are negligible not that there must be other powerful avenues through which it exerts its effects emphasis added the controversy over the effects of devaluation on the trade balance arises because according to frenkel and johnson 1976 42 the monetary approach rejects the emphasis given to the role of relative prices in the analysis of devaluation global monetarists argue that neither of the links in the chain postulated by the traditional approach is likely to hold in practice see laffer 1977 the major disagreement centers on the question of the effectiveness of nominal devaluation to affect the real exchange rate and the importance of the latter in influencing trade flows theoretical arguments have not settled the issue the question is as strongly debated today as it was forty years ago see for example branson 1983 katseli 1983 kaldor 1983 nashashibi 1983 and mckinnon 1981 nor does it seem that the available empirical evidence leads to a consistent answer the best known studies cooper 1971 laffer 1977 salant 1977 miles 1979 gylfason and risager 1984 reach contradictory conclusions 1 cooper and gylfason and risager find that devaluations improve the trade balance or current account while laffer and miles conclude exactly the opposite salant finds that devaluations improve the trade balance but not as often as the overall balance of payments in the face of such diverse findings frenkel 1984 suggests that a reexamination of the issue would be useful indeed himarios 1985 shows that a close examination of miles s widely quoted study reveals serious deficiencies that once addressed lead to opposite results this paper provides new evidence concerning the effectiveness of devaluation in trade balance adjustment the approach differs from past studies in several respects it differs from cooper s laffer s and salant s studies in that it accounts for the effects of other variables that affect the trade balance

intertemporal optimizing models of trade and current account balance a survey abstract this study surveys the intertemporal optimizing models of trade and current account balance that were developed calibrated and empirically tested since they came into vogue in the 1980s the implications of these models often differ from those of static and dynamic conventional non optimizing models the literature on optimizing models has not only grown reasonably fast but has also witnessed significant advances in methodology and these models have culminated into a distinct strand of new open economy macroeconomics the studies conducted until the late 1980s have used deterministic perfect foresight models while several studies conducted since the 1990s relax the perfect foresight and certainty equivalence assumptions and develop stochastic dynamic general equilibrium models to account for uncertainty confronting the optimizing agents the future research needs to explore the possibility of tracing any preferred specification of household preferences model the effect of time varying discount factor on household utility function and intertemporal budget constraint examine the role of costs in international trade place a parallel emphasis on the empirical verifications of theoretical propositions examine the relative performance of optimizing vis a vis non optimizing models and rationalize the extreme propositions of perfect and imperfect capital mobility in the wake of moderately open capital accounts

bilateral j curve between the uk vis a vis her major trading partners currency depreciation is said to worsen the trade balance first before resulting in an improvement yielding a short run pattern labelled the j curve phenomenon while early studies tested the j curve by using aggregate trade data a few recent studies have employed bilateral data mostly between the us and her major trading partners in this paper we extend the literature by considering the experience of the uk we test the phenomenon between the uk and her twenty major trading partners by employing data over 1973q1 2001q3 period in most instances we find no support for the j curve in the short run in the long run only in five cases has the exchange rate had significant impact on the bilateral trade balance

the j curve and nafta evidence from commodity trade between the us and mexico the north american free trade agreement nafta was predicted to have a substantial impact on the us mexico trade especially on specific importing and exporting industries in this article we use annual industry level export and import data from 1962 to 2004 to discern both the short and long run effects of real exchange rate depreciation on the mexico us trade balance as well as the effects of nafta on this trade we find that peso depreciation has a positive long run effect on 24 of 102 mexican industries and a negative short run effect on 19 of 102 industries only a small fraction 7 of 102 industries show any support for the j curve hypothesis nafta has had a significant effect on a significant number of the industries however

incentives and aggregate shocks this paper presents an incentive based theory of the dynamics of the distribution of consumption in the presence of aggregate shocks the paper builds on the models concerning the distribution of income or consumption and incentive problems of green 1987 thomas and worrall 1991 phelan and townsend 1991 and atkeson and lucas 1992 by incorporating aggregate production shocks the model allows an examination of the interactions between individual and aggregate consumption series given incomplete insurance further the methodology outlined allows the incorporation of incentive considerations to macroeconomic environments similar to rogerson 1988 and hansen 1985

do exchange rate changes have symmetric or asymmetric effects on the trade balances of asian countries abstractrecently the linear ardl approach was modified and a non linear version of the same approach that is used mostly to assess asymmetric effects of some exogenous variables on the dependent variable was introduced the non linear model was recently used by one study to show that indeed exchange rate changes have asymmetric effects on the trade balance of a few advanced countries the same was demonstrated for transition economies by another study in this article we provide additional asymmetric effects from seven asian economies by showing that in most cases we find evidence of short run and long run asymmetric effects of exchange rate changes on the trade balance like other studies our findings are country specific

dynamic contracting with persistent shocks abstract in this paper we develop continuous time methods for solving dynamic principal agent problems in which the agent s privately observed productivity shocks are persistent over time we characterize the optimal contract as the solution to a system of ordinary differential equations and show that under this contract the agent s utility converges to its lower bound immiserization occurs unlike under risk neutrality the wedge between the marginal rate of transformation and a low productivity agent s marginal rate of substitution between consumption and leisure will not vanish permanently at her first high productivity report also the wedge increases with the duration of a low productivity report we apply the methods to numerically solve the mirrleesian dynamic taxation model and find that the wedge is significantly larger than that in the independently and identically distributed i i d shock case

do exchange rates follow a random walk process in middle eastern countries abstract in this note we employ the kpss test in addition to the adf test to determine whether the real effective exchange rates in middle eastern countries follow a random walk process or they are stationary while in most cases the kpss test supported the stationary of the real effective rates thus the ppp the adf test did not the failure to support the ppp by the adf test is said to be due to its low power

how sensitive is commodity trade flows between us and india to currency depreciation previous studies that investigated the impact of real depreciation of the rupee on indian trade balance used aggregate trade data and provided no support for real depreciation to be effective in improving india s trade balance in this article we disaggregate the indian trade data by commodity and consider the sensitivity of each industry s inpayments export value and outpayments import value to real rupee dollar exchange rate annual data over the period of 1962 to 2004 from 40 industries that trade between the two countries as well as bounds testing approach are used to show that while in half of the industries real depreciation of rupee has short run effects on inpayments and outpayments the short run effects do not last into the long run in majority of the cases

is there a long run relation between the trade balance and the real effective exchange rate of ldcs abstract using quarterly data over 1973 1988 period the cointegration analysis is used and it is shown that the trade balance and the real effective exchange rate of some ldcs are cointegrated in the long run this approach is argued to be a close substitute for testing the marshall lerner condition

piecewise loglinear estimation of efficient production surfaces linear programming formulations for piecewise loglinear estimation of efficient production surfaces are derived from a set of basic properties postulated for the underlying production possibility sets unlike the piecewise linear model of banker charnes and cooper banker r d a charnes w w cooper 1984 models for the estimation of technical and scale inefficiencies in data envelopment analysis management sci 30 september 1078 1092 this approach permits the identification of increasing marginal products and estimation of the classical s shaped production functions methods are also provided for estimating technical inefficiencies and other production characteristics such as rates of substitution and transformation marginal products returns to scale and most productive scale sizes on the basis of observed production data the results of a simulation study are reported to illustrate the usefulness of this estimation method in empirical applications when there are a priori reasons to expect increasing marginal products in some regions of the production function a modified model is provided to extend this analysis to the situation of non competing outputs addressed by the bi extremal model of banker charnes cooper and schinnar banker r d a charnes w w cooper a schinnar 1981 a bi extremal principle for frontier estimation and efficiency evaluation management sci 27 december 1370 1382

optimal unemployment insurance this paper considers the design of an optimal unemployment insurance system the problem is modeled as a repeated principalagent problem involving a risk averse agent the unemployed worker and a risk neutral principal which cannot monitor the agent s search effort the optimal long term contract subject to the associated incentive constraints is characterized this contract involves a replacement ratio that decreases throughout the unemployment spell and a wage tax after reemployment that under some mild regularity conditions increases with the lenght of the unemployment spell some numerical results are presented that suggest that the gains from switching to this optimal unemployment insurance scheme could be quite large the performance of this optimal contract is also compared to alternative liquidity provision mechanisms

on efficient distribution with private information this paper is a study of the dynamics of the efficient distribution of consumption in an exchange economy with many consumers each of whom is subject to private idiosyncratic taste shocks we propose a recursive method for finding feasible allocations that are incentivecompatible and that are pareto optimal within this set the method is applied to several parametric examples we find that in an efficient allocation the degree of inequality continually increases with a diminishing fraction of the population receiving an increasing fraction of the resources we discuss the extent to which these allocations can be decentralized via market arrangements this paper is a study of the dynamics of the efficient distribution of consumption in an exchange economy with private information the economy we study has a constant endowment flow of a single non storable consumption good which is to be allocated each period among a large number of consumers each period these consumers experience unpredictable idiosyncratic privately observed taste shocks affecting their marginal utility of current consumption efficiency dictates that more resources be allocated to those consumers who in any given period have a high marginal utility of current consumption

collusion with persistent cost shocks we consider a dynamic bertrand game in which prices are publicly observed and each firm receives a privately observed cost shock in each period although cost shocks are independent across firms within a firm costs follow a first order markov process we analyze the set of collusive equilibria available to firms emphasizing the best collusive scheme for the firms at the start of the game in general there is a trade off between productive efficiency whereby the low cost firm serves the market in a given period and high prices we show that when costs are perfectly correlated over time within a firm if the distribution of costs is log concave and firms are sufficiently patient then the optimal collusive scheme entails price rigidity firms set the same price and share the market equally regardless of their respective costs when serial correlation of costs is imperfect partial productive efficiency is optimal for the case of two cost types first best collusion is possible if the firms are patient relative to the persistence of cost shocks but not otherwise we present numerical examples of first best collusive schemes

dynamic insurance with private information and balanced budgets this paper studies a dynamic insurance problem with bilateral asymmetric information and balanced budgets there are two infinitely lived agents in our model both risk averse and each has an i i d random endowment stream which is unobservable to the other in each period each agent must have a non negative consumption and together they must consume the entire aggregate endowment dynamic incentive compatibility in the nash sense is defined we give sufficient and necessary conditions for the existence of a constrained efficient contract we show that a constrained efficient contract can be characterized in a bellman equation we demonstrate that the long run distribution of expected utilities of each agent is not degenerate we also develop an algorithm for computing the efficient contract and in a numerical example we find that the consumption processes of the agents form stationary markov chains

repeated moral hazard and one sided commitment abstract this paper considers a repeated unobserved endowment economy with a restriction that agents can walk away from insurance contracts at the beginning of any period and contract with another insurer one sided commitment an equilibrium is derived characterized by a unique market determined insurance contract with the property that agents never want to walk away from it the paper shows that trade or insurance still occurs and that a non degenerate long run distribution of consumption exists a numerical example shows that this distribution is nearly log normal journal of economic literature classification numbers d30 d31 d80 d82

nominal and real effective exchange rates of middle eastern countries and their trade performance indexes of real and nominal effective exchange rates that are published by the imf are mostly for industrial countries none of the middle eastern countries have received any attention on this regard this paper tries to close the gap by constructing such indexes for 11 middle eastern countries over 1971 i 1994 iv period as an application long run response of their trade balance to devaluation is also investigated

optimal taxation in a habit formation economy abstract this paper studies habit formation in consumption preferences in a dynamic mirrlees economy we derive optimal labor and savings wedges based on a recursive approach we show that habit formation creates a motive for subsidizing labor supply and savings in particular habit formation invalidates the well known no distortion at the top result we demonstrate that the theoretical findings are quantitatively important in a parametrized life cycle model average labor and savings wedges fall by more than one third compared with the case of time separable preferences

asymmetric response of the us india trade balance to exchange rate changes evidence from 68 industries the relationship between the trade balance and the exchange rate continues to attract attention by international economists and has entered into new territory mostly due to advances in econometric methods the introduction of asymmetric error correction modelling and asymmetric cointegration using the nonlinear ardl approach of shin et al festschrift in honor of peter schmidt econometric methods and applications springer 2014 281 as compared to the symmetric and linear ardl approach of pesaran et al journal of applied econometrics 2001 16 289 has led us in a new direction to discover relatively better results we apply these methods to the bilateral trade balance model of each of the 68 industries that trade between india and the usa the nonlinear approach not only provides more support to the j curve effect but also yields support in favour of short run and long run asymmetric effects of exchange rate changes in most of the industries

income fluctuation and asymmetric information an example of a repeated principal agent problem we examine a simple repeated principal agent model with discounting there are a risk averse borrower with an unobservable random income and a risk neutral lender the efficient contract is characterized it tends to the first best constant consumption contract as the discount factor tends to one and the time horizon extends to infinity if the time horizon is infinite and the contract is legally enforceable the borrower s utility becomes arbitrarily negative with probability one if the borrower has constant absolute risk aversion consumption is transferred between any two states at a constant interest rate which is less than the rate of time preference

risky human capital and deferred capital income taxation abstract we study the structure of optimal wedges and capital taxes in a dynamic mirrlees economy with endogenous distribution of skills human capital is a private stochastic state variable that drives the skill process of each individual building on the findings of the labor literature we construct a tractable life cycle model of human capital evolution with risky investment and stochastic depreciation in this setting we demonstrate the optimality of a a human capital premium i e an excess return on human capital relative to physical capital b a large intertemporal wedge early in the life cycle and c a non zero intratemporal wedge even at the top of the skill distribution at all dates except the last date in the life cycle the main implication for the structure of optimal linear capital taxes is the necessity of deferred taxation of physical capital the average marginal tax rate on physical capital held in every period is zero in present value however expected capital tax payments do not equal zero in every period necessarily agents face negative expected capital tax payments early in the life cycle and positive expected capital tax payments late in the life cycle

on repeated moral hazard with discounting in this paper we analyze optimal contracts in an infinitely repeated agency model in which both the principal and agent discount the future we show that there is a stationary representation of the optimal contract when the agent s conditional discounted expected utility is used as a state variable this representation reduces the multi period problem to a static variational problem which can be analyzed using standard variational techniques this reduction is used to obtain several properties of the contract

equilibrium subprime lending this paper develops an equilibrium model of a subprime mortgage market our goal is to offer a benchmark with which the recent subprime boom and bust can be compared the model is tractable and delivers plausible orders of magnitude for borrowing capacities as well as default and trading intensities we offer simple explanations for several phenomena in the subprime market such as the prevalence of teaser rates and the clustering of defaults in our model both nondiversifiable and diversifiable income risks reduce debt capacities thus debt capacities need not be higher when a larger fraction of income risk is diversifiable

the j curve malaysia versus her major trading partners currency depreciation is said to worsen the trade balance before improving it hence the j curve phenomenon since introduction of cointegration and error correction modelling researchers have tried to distinguish the short run effects of currency depreciation from its long run effects a few studies that have investigated the experience of malaysia have relied upon aggregate trade data and have found no strong support for a significant relation between the real value of the ringgit and the malaysian trade balance in this article we disaggregate the data by country and consider malaysia s bilateral trade balance with her 14 largest trading partners using bound testing approach to cointegration and error correction modelling we provide some support for the j curve hypothesis