output dynamics in real business cycles models the time series literature reports two stylized facts about output dynamics in the united states gnp growth is positively autocorrelated and gnp appears to have an important trend reverting component this paper investigates whether current real business cycle rbc models are consistent with these stylized facts many rbc models have weak internal propagation mechanisms and must rely on external sources of dynamics to replicate both facts models that incorporate labor adjustment costs are partially successful they endogenously generate positive autocorrelation in output growth but they need implausibly large transitory shocks to match the trend reverting component in output

imperfect competition multiple equilibria and unemployment policy this paper takes a simple imperfectly competitive macro model with increasing returns and shows how it can lead to nonexistence or multiplicity of equilibria the consequences for government policy toward unemployment are explored and shown to be very different from the traditional model it is argued that a multiple equilibrium model is an attractive possible explanation of the behavior of u k unemployment in the 1980s copyright 1990 by royal economic society

how should control theory be used to calculate a time consistent government policy we study different solutions to a simple one dimensional linear quadratic game with a large number of private agents and a government a time consistent solution is defined as a solution to the hamilton jacobi bellman equation i e as a policy for which the government has noprecommitment capability this solution is compared to a policy where the government has an instantaneous pre commitment i e an equilibrium in which the government has a period by period leadership in both cases we show how control theory should be applied to calculate the equilibrium and how to relate these equilibria to the differential game literature

trade reforms credibility and development abstract this paper analyzes the implications of uncertainty regarding the future course of trade liberalization on investment and policies uncertainty concerning the future tariff rate is shown to depress saving and to operate as a subsidy tax on inward outward investment we identify the need to tax subsidize private investment in the importable exportable sector the elimination of sectorial private investment policies calls for a rise drop in the public private capital ratio in the outward oriented inward oriented activities in the presence of an external credit ceiling a higher degree of risk aversion increases the magnitude without changing the nature of the policies

rogoff s conservative central banker restored we show that delegation of monetary policy to a weight conservative central banker can be desirable although the government can also use an inflation contract an employment target an inflation target or any combination of these to control the central banker the key feature of our model is a stochastic inflation bias arising when wage setters receive some information about a supply shock prior to signing nominal wage contracts weight conservatism is found to be desirable if fully state contingent delegation is not possible and the stochastic inflation bias cannot be eliminated by optimal choice of the delegation parameters

monopolistic competition increasing returns to specialization and output persistence abstract devereux et al economics letters 1993 41 57 61 showed that introducing together imperfect competition and increasing returns to specialization into real business cycle rbc type models results in making output more persistent than the underlying technology shocks we carry out a simple generalization of their model which clearly disentangles the two features and show that the added persistence is actually because of the increasing returns to specialization

the inflation bias when the central bank targets the natural rate of unemployment abstract this paper studies the proposition that an inflation bias can arise in a setup where a central banker with asymmetric preferences targets the natural unemployment rate preferences are asymmetric in the sense that positive unemployment deviations from the natural rate are weighted more or less severely than negative deviations in the central banker s loss function the bias is proportional to the conditional variance of unemployment the time series predictions of the model are evaluated using data from g7 countries econometric estimates support the prediction that the conditional variance of unemployment and the rate of inflation are positively related

labor contracts and business cycles this paper investigates the claim often put forth by real business cycle proponents that the poor performance of their models in matching real world aggregate labor market behavior is due to the fact that observed real wage payments do not correspond to the actual marginal productivity of labor but contain an insurance component that cannot be accounted for by the walrasian pricing mechanism to test this idea we dispense with the walrasian description of the labor market and introduce contractual arrangements between employees and employers assuming that employees are prevented from accessing capital markets and are more risk averse than employers we use the theory of optimal contracts to derive an equilibrium relation between aggregate states of the economy and wage labor outcomes this contractual arrangement is then embedded into a standard one sector stochastic neoclassical growth model in order to look at the business cycle implications of the contractual hypothesis the resulting dynamic equi

conservative central banks and nominal growth exchange rate and inflation targets a framework is developed in which inflation biases with different target variables are compared a nominal growth target measured in consumer prices may yield less stabilization bias than a nominal income growth target exchange rate and inflation targets result in less stabilization bias than an income growth target the more important the terms of trade stabilization persistence in output causes excessive stabilization of productivity shocks and of shocks to the terms of trade under discretion an inflation weight conservative central bank is more likely under an inflation target than under an exchange rate target and less likely under a nominal income growth target

inward versus outward growth orientation in the presence of country risk the purpose of this paper is to model the role of trade dependency in determining the access of a developing economy to the international credit market and its desirable growth strategy with full integration of capital markets the choice with respect to the inwardness of a technology is irrelevant investment will be channeled to the more productive sectors independently of their trade inwardness with limited capital market integration a given investment will generate two effects the first is the standard direct productivity effect that is associated with the change in future output the second is the trade dependency externality generated by the change in future bargaining outcomes due to the change in the trade dependency of the nation with partial integration investment that increases trade dependency is desirable if the credit markets are disjoint due to partial defaults higher trade dependency is disadvantageous thus higher trade dependency generates a positive externality with partial integration of capital markets and a negative externality with disjoint credit markets we show that credit market integration is determined by the size of the indebtedness relative to the trade dependency as reflected by the repayment burden that is supported by the bargaining outcome the repayment bargaining outcome is determined by the sectoral composition of the economy and by the effective size of the developing and the developed economies this abstract was borrowed from another version of this item

seigniorage operating rules and the high inflation trap there may be both a high and a low inflation equilibrium when the government finances the deficit through seigniorage under rational expectations the high inflation equilibrium is stable and the low inflation equilibrium unstable under adaptive expectations or lagged adjustment of money balances with rational expectations the low inflation equilibrium may be stable adding bond financing dual equilibria remain if the government fixes the real interest rate but a unique equilibrium is attained when the government sets a nominal anchor for the economy the existence of dual equilibria is thus a result of the government s operating rules

deficits and intergenerational welfare in open economies this paper deals with public debt in open economies extending diamond s overlapping generations model to a small open economy as well as an international equilibrium of two large economies it focuses on the intergenerational welfare redistributions caused by an increase in public debt triggered by a temporary government budget deficit and shows how these redistributions differ in open and closed economies the interplay between the deficits in the government budget and the current account is also analyzed it is shown how a single period with a government deficit can be followed by a sequence of periods with a deficit in the current account

dynamic wage employment bargaining with employment adjustment costs this paper looks at the consequences of introducing employment adjustment costs into two standard models of trade unions the right to manage model and the efficient bargain model the authors look at how unions affect both the speed of adjustment to equilibrium and the long run equilibrium they examine the consequences of the model for the estimation of dynamic labor demand equations and for the testing of trade union models copyright 1989 by royal economic society

centralized wage setting and monetary policy in a reputational equilibrium this paper analyzes a repeated game between the central bank and a centralized trade union the central bank would be better off if it could commit to a noninflationary strategy when this commitment is not enforceable a noninflationary equilibrium can still be sustained by a reputational mechanism if the central bank has superior information about its own objective function the qualitative properties of this reputational equilibrium are shown to differ from the cases considered in the existing literature where the central bank was modeled as playing a game against competitive labor markets copyright 1988 by ohio state university press

fiscal deficits and relative prices in a growing world economy abstract this paper studies the transmission of fiscal disturbances between countries and the effect of those disturbances on worldwide capital intensity in a context of growth the model developed to address these issues allows for the production of both nontradable and relatively capital intensive tradable goods a central finding is that factor markets can be a major channel for the communication of fiscal policy shocks to world interest rates to private saving decisions and ultimately to global asset supplies and their distribution among countries particular predictions of the model illustrate how changes in public debt ratios and shifts in government spending patterns affect resource allocation and the welfare of various generations both at home and abroad

strategic complementarity in business formation aggregate fluctuations and sunspot equilibria the extent to which changes in beliefs can be important factors in initiating economic fluctuations has been a prominent area of investigation for macroeconomists the notion that beliefs about the future influence current decisions is a property of almost all dynamic economic systems the more challenging task is identifying economic environments in which changes in beliefs alone influence current choices in such a way that the variations in beliefs are self fulfilling because the resulting fluctuations arise in the absence of variations in fundamental variables such as preferences and technology they are often termed sunspot equilibria apart from suggesting that instability of expectations may be a distinct source of cyclical volatility sunspot equilibria may also explain why apparently small disturbances in fundamentals lead to large change in macroeconomic aggregates in this study we demonstrate the possibility of sunspot equilibria in an overlappinggenerations economy characterized by a plausible form of strategic complementarity as more agents enter as producers in any particular sector of the economy they create an incentive for agents to enter as producers into other sectors as well 2 the basis for this

monopolistic competition increasing returns to scale and the importance of productivity shocks abstract the neoclassical growth model is extended to incorporate monopolistic competition and increasing returns to scale implications for the measurement of productivity change through the solow residual are studied it is found that for this extension productivity fluctuations continue to account for a substantial fraction of output volatility the model cannot account for volatility of employment

exchange rate policy wage formation and credibility abstract since the collapse of the bretton woods system some european countries have pursued discretionary exchange rate policies in order to maintain or enhance the international competitiveness of the traded goods sector these countries which typically feature centralized wage setting have also tended to experience high nominal wage increases the overall outcome may be described as a devaluation wage spiral this paper applies two models of repeated games to analyze the strategic interaction between an exchange rate setting policy maker and a wage setting trade union it is shown how a devaluation wage spiral may result from a conflict of interest over the real wage it is also shown how reputational forces may provide a way out of the devaluation wage spiral

the handbook of international macroeconomics preface 1 introduction rick van der ploeg amsterdam 2 quantity constrained models of open economies neil rankin warwick 3 imperfect competition and open economy macroeconomics huw d dixon york 4 relative price movements in dynamic general equilibrium models of international trade david backus nyu patrick kehoe pennsylvania and finn kydland carnegie mellon 5 international fiscal policy coordination and competition assaf razin and efraim sadka tel aviv 6 capital taxation in the world economy a lans bovenberg tilburg 7 history of the international monetary system implications for research in international macroeconomics and finance barry eichengreen berkeley 8 on inflation unemployment and the optimal exchange rate regime george alogoskoufis athens 9 macroeconomic policy speculative attacks and balance of payments crisis pierre richard agenor and robert p flood imf 10 continuous time models of exchange rates and intervention giuseppe bertola princeton 11 stylized facts of nominal exchange rate returns casper g de vries leuven 12 partial versus general equilibrium models of international capital market equilibrium 13 sovereign debt kenneth kletzer santa cruz 14 growth and external debt daniel cohen cepremap 15 growth and deficits in an interdependent world index

discretionary policy and multiple equilibria in lq re models we study discretionary equilibria in dynamic linear quadratic rational expectations models in contrast to the assumptions that pervade this literature we show that these models do have multiple equilibria in some situations we demonstrate the existence of multiple discretionary equilibria by example we investigate general properties of discretionary equilibria and discuss implications for numerical algorithms

time consistent protection with learning by doing abstract can a government induce efficiency gains in his domestic industry by protecting it against foreign competition would such trade protection be time consistent the present paper builds a dynamic equilibrium model that accounts for learning by doing effects that link firms strategies over time the model shows that the existence of dynamic economies of scale suffices to overcome the traditional government s lack of commitment of its tariff policy this paper compares the infinite horizon markov perfect equilibrium of this game with the dynamic equilibrium under commitment as well as the static nash equilibrium equilibrium strategies are derived in closed form by solving a linear quadratic differential game optimal trade policy involves higher tariff levels than in the static setup in order to account for future gains in efficiency under reasonable assumptions the unique stable mpe is characterized by a domestic price and tariff that decrease as experience accumulates thus supporting the future liberalization of trade as an equilibrium feature of this dynamic game

current real business cycle theories and aggregate labor market fluctuations hours worked and the return to working are weakly correlated traditionally the ability to account for this fact has been a litmus test for macroeconomic models existing real business cycle models fail this test dramatically we modify prototypical real business cycle models by allowing government consumption shocks to influence labor market dynamics this modification can in principle bring the models into closer conformity with the data our empirical results indicate that it does

firm entry markups and the monetary transmission mechanism abstract two business cycle models with endogenous firm and product entry are estimated by matching impulse responses to a monetary policy shock the competition effect implies that entry lowers desired markups and dampens inflation under translog preferences where the substitutability between goods depends on their number we find evidence of such an effect that model generates more countercyclical markups than dixit and stiglitz 1977 monopolistic competition model where price stickiness is the only source of markup fluctuations in contrast a model with strategic interactions between oligopolistic firms cannot generate an empirically relevant competition effect and is statistically equivalent to the dixit stiglitz model

the dynamic effects of aggregate demand and supply disturbances we interpret fluctuations in gnp and unemployment as due to two types of disturbances disturbances that have a permanent effect on output and disturbances that do not we interpret the first as supply disturbances the second as demand disturbances demand disturbances have a hump shaped mirror image effect on output and unemployment the effect of supply disturbances on output increases steadily over time peaking after two years and reaching a plateau after five years

challenges facing natural rate theory abstract this paper attempts to test the natural rate hypothesis by looking at historical unemployment data for france the uk and the us we find that the unemployment series can be described as stationary around an infrequently changing mean moreover that the speed of convergence towards mean unemployment is slower when unemployment is high and differs across the three countries the two european countries having more persistence we do not find any evidence that the persistence of a change in unemployment is a function of the size of the change we conclude that the data are consistent with multiple equilibria models where large shocks bring the economy from one equilibrium to another and also with models with a moving natural rate

monopolistic competition as a foundation for keynesian macroeconomic models a general equilibrium macroeconomic model based on monopolistic competition is presented the model exhibits a traditional multiplier in the short run but due to free entry the multiplier disappears in the long run by construction all agents are fully rational the keynesian results are a consequence of the assumption of monopolistic competition which creates a divergence between optimal private behavior and optimal social behavior

generalised soft binomial american real option pricing model fuzzy stochastic approach abstract the stochastic discrete binomial models and continuous models are usually applied in option valuation valuation of the real american options is solved usually by the numerical procedures therefore binomial model is suitable approach for appraising the options of american type however there is not in several situations especially in real option methodology application at to disposal input data of required quality two aspects of input data uncertainty should be distinguished risk stochastic and vagueness fuzzy traditionally input data are in a form of real crisp numbers or crisp stochastic distribution function therefore hybrid models combination of risk and vagueness could be useful approach in option valuation generalised hybrid fuzzy stochastic binomial american real option model under fuzzy numbers t numbers and decomposition principle is proposed and described input data up index down index growth rate initial underlying asset price exercise price and risk free rate are in a form of fuzzy numbers and result possibility expected option value is also determined vaguely as a fuzzy set illustrative example of equity valuation as an american real call option is presented

on union preferences and labour market models insiders and outsiders this paper constructs a model of trade union behavior in which there is a distinction between insiders and outsiders this is used to examine one of the most troublesome issues in macroeconomic theory namely the extent to which a rise in aggregate demand might generate wage increases rather than growth in employment a generalization of the most widely used union utility function is presented the analysis reveals the conditions under which insiders will agree to let outsiders into employment derives two step wage preferences and proves a new result on wage rigidity copyright 1987 by royal economic society

indivisible labor lotteries and equilibrium abstract this paper considers an economy where labor is indivisible and agents are identical although the discontinuity in labor supply at the individual level disappears as a result of aggregation it is shown that indivisible labor has strong consequences for the aggregate bahavior of the economy it is also shown that optimal allocations involve lotteries over employment and consumption

unemployment in britain male unemployment in britain has risen from around 2 per cent in the 1950s to around 17 per cent in 1985 see figure 1 the figures are for male unemployment because there is no consistent series for women 1 even more remarkably unemployment has fallen in only three years out of the last twenty 1973 1978 and 1979 to account for this we need a model that explains both changes in the natural or non accelerating inflation rate of unemployment nairu and deviations from it we use a three equation supply side model centred on the labour market this has two main features the first concerns the determination of employment in the short run the labour demand function that we use cuts through the fruitless debate now raging especially in europe as to whether current unemployment is classical or keynesian according to the classical view employment is too high because real wages are too high according to the keynesian view real wages are not binding and unemployment is high because the product market does not clear with prices too high relative to nominal demand the whole debate is set in the framework of perfect competition yet in perfect competition prices are set by impersonal forces and it is not clear what could possibly stop prices clearing the market it is much more reasonable to think of prices as being set by imperfectly competitive firms existing prices being the best they can think of given the demand they face in this context firms demand for labour will depend on both the real product wage and the level of real aggregate demand this is the demand function we estimate and it conforms both to common sense and to the data however this does not imply that employment can be made to grow without limit by pumping up real demand for in the medium term when price surprises are eliminated our model determines three variables employment real wages and real demand on the basis of three equations an employment equation a price equation and a wage equation thus in the medium term there is a natural level of employment and corresponding to this a natural level of real aggregate demand the second key feature of our model concerns the medium term determination of unemployment in the medium term the planned mark up of wages over prices in wage settlements must be consistent with the mark up of prices over wage costs in employers pricing behaviour for if wage setters try to set real product wages higher than is consistent with employers pricing behaviour this generates ever increasing inflation thus the key to understanding unemployment in the medium term is the behaviour of wage setters if events occur that push them towards too high real wages then unemployment has to rise to offset these influences we shall call these influences wage pressure variables or push factors and they are clearly crucial in understanding unemployment the variables here include the social security system employment protection

indivisible labor and the business cycle abstract a growth model with shocks to technology is studied labor is indivisible so all variability in hours worked is due to fluctuations in the number employed we find that unlike previous equilibrium models of the business cycle this economy displays large fluctuations in hours worked and relatively small fluctuations in productivity this finding is independent of individuals willingness to substitute leisure across time this and other findings are the result of studying and comparing summary statistics describing this economy an economy with divisible labor and post war u s time series

insider power unemployment dynamics and multiple inflation equilibria this paper incorporates employment dynamics due to insider power into the barro gordon theory of inflation unlike in the static barro gordon case and even though our infinitehorizon model is linear quadratic there can be two markov perfect equilibria so that the same unemployment may correspond to either low or high inflation both equilibrium inflation rates measured per unit of the gap between the insiders and government s employment targets are higher than the corresponding rate in the static case the low inflation equilibrium has intuitive comparative statics properties in that inflation is increasing in insider power and the discount factor but the high inflation equilibrium behaves in the opposite way the highinflation equilibrium can be eliminated by a future precommitment to a fixed inflation regime e g erm but only if this precommitment can be made with certainty contrary to the static model inflation may be lower when the union puts a positive weight on a wage target than when it cares only about employment even when this wage target is consistent with a lower employment level than the employment target

a dynamic model of trade union behaviour this paper constructs a dynamic model of trade union behavior in which union membership is endogenous unemployed workers are assumed to leave their union as they seem to in reality and the union must therefore solve an intertemporal optim ization problem the results imply that conventional static models ov erstate the distortions caused by monopoly unionism and that the rece nt empirical mod els of union behavior may be misspecified the paper s analysis can be seen as an attempt to construct a model of the pos t entry closed shop copyright 1987 by the review of economic studies limited

indeterminacy and increasing returns abstract we investigate properties of the one sector growth model with increasing returns under two organizational structures capable of reconciling the existence of aggregate increasing returns with competitive behavior by firms the first involves input externalities the second involves monopolistic competition we show for parameters in close accord with recent literature on real business cycles that the model displays an indeterminate steady state that can be exploited to generate a model of business fluctuations driven by self fulfilling beliefs in our first class of models growth is generated by exogenous increases in factor productivity in the second class the marginal product of capital is large enough for endogenous growth journal of economic literature classification numbers e00 e3 o40

market entry and international propagation of business cycles abstract in this paper pro cyclical market entry acts as an international transmission mechanism for business cycle shocks in an imperfectly competitive dynamic equilibrium model an expansion in one open economy leads to additional business formation in a parallel large open economy through demand spillovers business formation causes a decline in markups leading to an expansion in employment production and investment in both economies the modeling of the entry decision is critical only when the entry game is modelled as sequential with incumbents enjoying a first mover advantage are markups sufficiently elastic to cause international comovement

market structure and cyclical fluctuations in u s manufacturing the relevance of imperfect competition for models of economic fluctuations has received increased attention from researchers in both macroeconomics and industrial organization the authors outline a new methodology for estimating industry markups of price over marginal cost and the influence of market structure on cyclical movements in total factor productivity measures of industry concentration import competition and unionization are important for explaining markups in some industry groups much of the estimated markup of price over marginal cost is accounted for by noncapital fixed costs finally the authors show that their estimated margins fluctuate substantially over the cycle in particular markups are countercyclical especially in concentrated durable goods industries copyright 1988 by mit press

monopolistic competition business cycles and the composition of aggregate demand abstract we develop a dynamic general equilibrium model with monopolistically competitive firms and endogenous markups and show the possibility of equilibria with persistent fluctuations driven by self fulfilling revisions of expectations for some parameter values such fluctuations are characterized by time series properties similar to those observed in u s postwar business cycles in contrast with the existing literature our results do not rely on the presence of increasing returns or nominal rigidities a key ingredient of the model is the link between markups and the composition of aggregate demand some econometric evidence on the latter is also reported journal of economic literature classification number d43 d58 e32

unemployment a survey this paper presents a survey of the economics of unemployment it covers competitive and imperfect competition models the role of different methods of wage determination and explanation of postwar unemployment patterns in the oecd countries copyright 1990 by royal economic society

the determinants of wage pressure some implications of a dynamic model most models of wage determination are static this paper analyzes a simple dynamic model of collective bargaining and argues that this provides insights into the determinants of wage pressure that a static model cannot provide in particular it is shown how the length of labor contracts and the dynamics of the labor market affect the level of aggregate wage pressure the policy implications of the model are very different from those traditionally put forward to moderate wage pressure copyright 1991 by the london school of economics and political science

factor hoarding and the propagation of business cycles shocks this paper analyzes the role of variable capital utilization rates in propagating shocks over the business cycle to this end we formulate and estimate an equilibrium business cycle model in which cyclical capital utilization rates are viewed as a form of factor hoarding we find that variable capital utilization rates substantially magnify and propagate the impact of shocks to agents environments the strength of these propagation effects is evident in the dynamic response functions of various economy wide aggregates to shocks in agents environments in the statistics that we construct to summarize the strength of the propagation mechanisms in the model and in the volatility of exogenous technology shocks needed to explain the observed variability in aggregate u s output other authors have argued that standard real business cycle rbc models fail to account for certain features of the data because they do not embody quantitatively important propagation mechanisms these features include the observed positive serial correlation in the growth rate of output the shape of the spectrum of the growth rate of real output and the correlation between the forecastable component of real output and various other economic aggregates allowing for variable capital utilization rates substantially improves the ability of the model to account for these features of the data

the cyclical behaviour of wages and profits under imperfect competition the authors build a dynamic model of the business cycle with monopolistically competitive firms with simple assumptions concerning firm entry and exit the model can explain some stylized facts of the business cycle that standard real business cycle models cannot predict they include the cyclical behavior of the shares of capital and labor income in total income and the pattern of net firm creation these predictions are robust to whether the main source of the business cycle is aggregate supply shocks or aggregate demand shocks

trade reform aggregate investment and capital flight on credibility and the value of information abstract in this paper we demonstrate that uncertainty about future policy reversals coupled with irreversible investment confers an option value to foreign exchange and may lead to capital flight and a fall in aggregate investment after a trade reform the analysis focuses on the value of information and the credibility of the policy reform the conclusion points to a potential role for international institutions to prevent such problems

impulse dynamics and propagation mechanisms in a real business cycle model abstract in a typical real business cycle model we find that output dynamics are determined primarily by impulse dynamics and that endogenous propagation mechanisms are weak consequently the model must rely on external sources of dynamics in order to replicate the univariate dynamics of u s per capita gnp

the clash of central bankers with labour market insiders and the persistence of inflation and unemployment this paper analyses the implications of monetary policy for the dynamic behaviour of inflation in a natural rate model characterized by endogenous unemployment persistence we present evidence for the main industrial economies that suggests that inflation displays persistence which is of the same order of magnitude as the persistence of deviations of unemployment from its natural rate we provide a theoretical explanation of this fact based on a model of the dynamic interactions between central bankers and labour market insiders the clash in the objectives of central bankers and labour market insiders is what causes both inflation and unemployment to display the same persistence in this model the analysis suggests that inflation persistence could be addressed in a welfare improving way if central banks adopted monetary policy rules that targeted unanticipated changes in unemployment rates instead of deviations of unemployment from its natural rate

the narrow moving band the dutch disease and the competitive consequences of mrs thatcher notes on trade in the presence of dynamic scale economies abstract this paper presents a model of trade in which comparative advantage instead of being determined by underlying attributes of countries evolves over time through learning by doing in this model arbitrary patterns of specialization once established tend to become entrenched over time the model sheds light on three widely held views that do not make sense in more conventional models first is the view that temporary protection of selected sectors can permanently alter the pattern of comparative advantage in the protecting country s favor second is the view that seemingly favorable developments such as the discovery of exportable natural resources may lead to a permanent loss of other sectors and reduce welfare in the long run third is the possibility that a temporary overvaluation of a currency due to tight money can lead to a permanent loss of competitiveness in some sectors

confidence and the real value of money in an overlapping generations economy we demonstrate that stochastic bubbles which have a constant exogenous probability of collapsing may exist in general equilibrium on an intrinsically useless and unbacked asset money this may happen provided that the probability q that the bubble will persist next period is large enough and exceeds a threshold level q which we call the minimum rate of confidence this condition is always violated when the economy without bubble is dynamically efficient it is more likely to be satisfied in dynamically inefficient economies the larger the size of the inefficiency as measured by the excess of the growth rate over the no bubble interest rate we study both exchange and production economies

unemployment persistence does the size of the shock matter one of the stylized facts of unemployment is that shifts in its mean rate between decades and half decades account for most of its variance in this paper we use a statistical analysis based on markov switching regression models to identify the dates of infrequent changes in the mean of the unemployment rate series of fifteen countries we find that in most countries unemployment persistence is much reduced once the infrequently changing mean rate induced by large shocks to unemployment has been removed we conclude that the observed persistence in unemployment appears to be consistent with multiple equilibria models and models with an endogeneous natural rate 1998 john wiley sons ltd

monopolistic competition and the effects of aggregate demand how important is monopolistic competition to an understanding of the effects of aggregate demand on output we ask the question at three levels can monopolistic competition by itself explain why aggregate demand movements affect output can it together with other imperfections generate effects of aggregate demand in a way that perfect competition cannot if so can it give an accurate account of the response of the economy to aggregate demand movements the answers are no yes and yes

endogenous markups intensity of competition and persistence of business cycles in order to study the propagation mechanism of business cycles in particular to investigate how the intensity of competition affects market structure and output persistence over business cycles this paper presents a real business cycle model with imperfect competition and increasing returns to scale this analysis considers the markups of price over cost to be endogenous with endogenous markups two standard forms of oligopolistic competition bertrand and cournot are considered results show that 1 the propagation mechanism in the sense of output persistence is greater under cournot 2 the propagation mechanism is unequivocally greater with imperfect competition regardless of whether markups are endogenous or not and 3 under imperfect competition the propagation mechanism is greater with endogenous markups than with exogenous markups overall these results suggest that more intense competition produces lower persistence in output growth and thus a weaker propagation mechanism in a calibration exercise these differences were also found to be quantitatively important

imperfectly competitive cycles with keynesian and walrasian features abstract we consider a multi sector overlapping generations model with oligopolistic firms in the output markets and wage setting trade unions in the labour markets a coordination problem between firms creates multiple temporary equilibria which are either walrasian or of the keynesian unemployment type there exist many deterministic and stochastic equilibrium cycles fluctuating between keynesian recession and walrasian boom periods with arbitrarily long phases in each regime the cycles are in accordance with certain empirical regularities money is neutral and superneutral but appropriate countercyclical fiscal policies stabilize the cycles in a textbook keynesian way

optimal monetary policy rules in a rational expectations model of the phillips curve using a rational expectations model based on a phillips curve with persistence in inflation we derive optimal monetary policy rules under both commitment and discretion we assume that the central bank targets the natural rate of output so there is no incentive generating an average inflation bias with commitment inflation has less persistence but more conditional variability whereas output has more persistence and less conditional variability than with discretion as the commitment strategy stabilizes the systematic component of inflation it is less responsive to random shocks to inflation

trade liberalization credibility and self fulfilling failures abstract this paper addresses the question of whether there may be a self fulfilling aspect to the failure of liberalization attempts when it is widely known the government will abandon the reform if the central bank suffers an unacceptably large loss in reserves i derive the conditions for both sustained reform and a self fulfilling failure to be equilibrium outcomes under certain well defined conditions liberalization is most likely to succeed when the capital account is open

imperfect competition underemployment equilibria and fiscal policy it is often claimed that the demand externality created by imperfect competition can provide an analytical basis for keynesian fiscal policy prescriptions here this demand externality is embedded in a model of monopolistic competition where saving and employment are determined by optimizing choices it turns out that underemployment equilibria do exist that there is scope for fiscal intervention but that keynesian fiscal prescriptions are turned on their head thus demand externalities among imperfect competitors do not provide a general theoretical basis for these prescriptions unless supplemented by other deviations from the walrasian standard in the labor or capital market copyright 1990 by royal economic society

fiscal policy multipliers the role of monopolistic competition scale economies and intertemporal substitution in labour supply a dynamic macroeconomic model of monopolistic competition is developed for the closed economy forward looking consumers demand differentiated goods supply labour and save part of their income in the form of shares producers manufacture the differentiated goods by using labour and capital we study the short run transition and long run effects of fiscal policy comparisons with the new classical case of perfect competition are made simple expressions far multipliers are derived the sensitivity of the multipliers for diversity preference and ethier productivity effects intratemporal and intertemporal substitution effects and markup effects under free and restricted entry are also studied

dynamic commitment and incomplete policy rules considering the dynamics of commitment highlights some neglected features of time inconsistency problems we modify the standard rules versus discretion question in three ways 1 a government that does not commit today retains the option to do so tomorrow 2 the government s commitment capability is restricted to a class of simple rules and 3 the government s ability to make irrevocable commitments is restricted three results stand out first the option to wait makes the incumbent regime rules or discretion relatively more attractive second the option to wait means that increased uncertainty makes the incumbent regime more attlwactive third because the commitment decision takes place in real time policy choice displays hysteresis when monetary policy is subject to dynamic inconsistencies optimal policy requires some precommitment by the central bank despite a proliferation of mechanisms designed to address this problem work in this area has continued to assume a once and for all choice between rules and discretion this paper asks two closely related questions first what happens if commitment decisions are made in real time so that failure to commit today does not rule out the possibility of commitment tomorrow second if governments can make only commitments that are difficult but not impossible to reverse what determines the dynamics of commitment and reversal the assumption of once and for all choice enforces simplistic dynamics on the policy process if the standard models are interpreted literally for example the commitment problem for u s monetary policy is moot having been resolved with the founding of the federal reserve system in 1914 if not at the constitutional convention of 1789 much of the interest in dynamic inconsistency however arises pre

optimal monetary policy with endogenous entry and product variety deviations from long run price stability are optimal in the presence of endogenous entry and product variety in a sticky price model in which price stability would be optimal otherwise long run inflation deflation is optimal when the benefit of variety to consumers falls short of exceeds the market incentive for creating that variety the desired markup price indexation exacerbates this mechanism plausible preference specifications and parameter values justify positive long run inflation rates however short run price stability around this non zero trend is close to optimal even in the presence of endogenously time varying desired markups that distort the intertemporal allocation of resources

employment determination in british industry investigations using micro data this paper derives and then estimates a model of employment where unions and firms bargain over wages and possibly employment and efficiency wage considerations may be important it illustrates the difficulties associated in interpreting many existing attempts to discriminate between alternative models the results based on over 200 u k firms suggest that employment is negatively related to the firm s own wage and the change in the own wage relative to outside opportunities the latter may be an efficiency wage effect various financial factors are also seen to have a significant effect on employment

multiple equilibria in the british labour market some empirical evidence abstract this paper takes a simple imperfectly competitive aggregate labour market model with increasing returns which can lead to non existence or multiplicity of equilibria the model is estimated using annual aggregate data for britain some evidence is found and recent british economic history is interpreted using the model

multiple expectational equilibria under monopolistic competition this paper shows that a monopolistically competitive economy with real investment can have multiple rational expectations equilibria one is associated with entrepreneurs optimistic expectations about future demand another with entrepreneurs pessimism it also shows that an optimistic expectational equilibrium pareto dominates a pessimistic equilibrium an investment subsidy can be beneficial both by reducing the original underinvestment distortion and by changing firms expectations from pessimistic to optimistic the most important assumption is increasing returns to scale and monopolistic competition makes increasing returns consistent with each producer s optimization

why does unemployment persist the main movements of unemployment correspond to fluctuations in the short run nairu around a stable long term nairu these supply side fluctuations have two main origins i variations in the number of insiders involved in wage setting ii variations in the effectiveness of the unemployed outsiders as potential job seekers the evidence of micro studies suggests that ii is more important than i and this also helps to explain the widespread shift outwards in the u v curve to derive these arguments rigorously the paper presents a simple model of efficiency wages another of collective bargaining and finally a fully dynamic model with labour market flows

bounded rationality and strategic complementarity in a macroeconomic model policy effects persistence and multipliers motivated by recent developments in the bounded rationality and strategic complementarity literatures we examine an intentionally simple and stylized aggregative economic model when the assumptions of fully rational expectations and no strategic interactions are relaxed we show that small deviations from rational expectations taken alone lead only to small deviations from classical policy ineffectiveness but that the situation can change dramatically when strategic complementarity is introduced strategic complementarity magnifies the effects of even small departures from rational expectations producing equilibria with policy effectiveness output persistence and multiplier effects

firm entry excess capacity and endogenous productivity abstract we show that sluggish firm entry causes productivity to vary endogenously in response to technology shocks the endogenous productivity effect is caused by incumbent firms utilizing excess capacity as entry adjusts we develop a nonparametric model of endogenous sunk costs and monopolistic competition to show that imperfect competition and dynamic entry are necessary and jointly sufficient conditions for endogenous productivity fluctuations quantitatively we show the endogenous productivity effect is as large as that from a traditional capital utilization effect

irreversible investment with price ceilings a model of irreversible investment in a competitive industry under demand uncertainty is developed in the absence of restrictions investment by itself will keep the price from rising above a natural ceiling that exceeds the long run average cost by an option value factor when a lower ceiling is imposed investment is triggered only by the observation of an even higher shadow price as the imposed ceiling is reduced to the long run average cost this shadow price goes to infinity and investment ceases completely because investment is depressed a tighter price ceiling generally leads to a higher long run average price

asset bubbles and endogenous growth abstract we study the interaction between productive and nonproductive savings in economies with endogenous long run growth as in the neoclassical growth setting with overlapping generations asset bubbles can exist in an economy with endogenous growth provided that they are not too large and that the growth rate in the equilibrium without bubbles exceeds the interest rate here the existence conditions for bubbles reflect parameters of tastes and technology we find that bubbles when they exist retard the growth of the economy perhaps even in the long run and reduce the welfare of all generations born after the bubble appears

application of the fuzzy stochastic methodology to appraising the firm value as a european call option abstract the valuing of a firm equity as a call option is a crucial problem in financial decision making there are two basic aspects that are studied contingent claim features payoff functions and risk stochastic process of underlying assets however non preciseness vagueness uncertainty of input data is often neglected thus a combination of risk stochastic and uncertainty fuzzy instruments could be a useful approach in calculating a firm value as a call option the black scholes methodology of appraising equity as a european call option is applied fuzzy stochastic methodology under fuzzy numbers t numbers is proposed and described fuzzy stochastic model of appraising a firm equity is proposed input data are in a form of fuzzy numbers and result firm possibility expected equity value is also determined vaguely as a fuzzy set illustrative example is introduced

the dynamics of inflation with constant deficit under expected regime change a model that describes the dynamics of inflation with a fully anticipated stabilization program is developed it is shown that with a constant deficit an economy tends to stay at the neighborhood of the lower of the two state inflation rates that are compatible with the deficit further increasing inflation rates prior to the stabilization are compatible only with deficits that are lower than the maximal feasible staedy state deficits and with a stabilization program that reduces the demand for real balances if these conditions are not met inflation decreases towards the stabilization date it is argued that the data generated by actual inflationary episodes fit the conditions described above and corroborate the model this abstract was borrowed from another version of this item this abstract was borrowed from another version of this item

welfare improving debt policy under monopolistic competition abstract we analyse the effects of debt policy in an overlapping generations model with monopolistic competition debt crowds out capital and raises interest rates but unlike competitive models this is welfare improving for all generations if the elasticities of substitution in production are low in a non competitive model the social marginal product of capital could be negative while the rate of interest exceeds the population growth rate the latter two are non negative and profits exceed investment

wage setting and the tax system theory and evidence for the united kingdom abstract this paper analyses the effects of a non linear tax system on wage bargaining the main conclusions are an increase in the marginal income or payroll tax rate reduces the pre tax wage in the isoelastic case an increase in the average tax rate increases the pre tax wage by more than the tax increase and a measure of the progressivity of the tax system residual income progression is a sufficient measure of the effect of the tax system on wage pressure empirical evidence is presented to support these propositions and the predictions of the model regarding the effect of recent changes to the u k tax system on the distribution of earnings discussed

monopolistic competition transaction costs and multiple equilibria abstract this paper analyzes the role of transactions costs in a macroeconomic model of monopolistic competition if there is sufficient increasing returns to scale in transaction technology the economy exhibits multiple equilibria even if the production technology is constant or decreasing returns to scale

time to enter and business cycles abstract this paper examines a model in which market entry forms a business cycle propagation mechanism during expansionary periods new firms enter previously monopolized markets creating efficiency gains that amplify the effect of technology and fiscal policy shocks on employment market entry is delayed creating a dynamic pattern to output growth closer to that observed in the us economy than the standard rbc model