productivity dispersion and output fluctuations an evolutionary model we develop a model of technology choice with search costs innovators develop technology of varying quality or productivity firms acquire technology after paying a search cost to find high productivity technology the resulting model has mixed equilibria with productivity dispersion however such mixed equilibria are unstable under the logit dynamic from evolutionary game theory instead the economy converges to limit cycles whose existence we verify numerically we conclude therefore that mixed equilibria is not a robust explanation of productivity dispersion in our model instead such productivity dispersion is a cyclical phenomenon an additional implication is that cyclical productivity dispersion contributes to endogenous fluctuations in aggregate output

comparison shopping as a simultaneous move game this paper analyzes simultaneous move models of comparison shopping it shows that the equilibria in wilde schwartz 1979 can be rationalized as symmetric mixed strategies in an appropriately defined game in which information acquisition costs are endogenous it also shown that in the simultaneous move version of salop stiglitz 1977 nonexistence of equilibrium is not a problem in fact a variety of forms of equilibria emerge in that model pure strategy mixed strategy and blends of the two copyright 1992 by royal economic society

unemployment growth and taxation in industrial countries unemployeement and taxes do taxes affect the rate of umemployeement to the layman the upward trend in european unemployment is related to the slowdown of economic growth we argue that the layman s view is correct the increase in european unemployment and the slowdown in economic growth are related because they stem from a common cause an excessively rapid growth in the cost of labour in europe labour costs have gone up for many reasons but one is particularly easy to identify higher taxes on labour if wages are set by strong and decentralized trade unions an increase in labour taxes is shifted onto higher real wages this has two effects first it reduces labour demand and thus creates unemployment secondly as firms substitute capital for labour the marginal product of capital falls over long periods of time this in turn diminishes the incentive to invest and to grow the data strongly support this view according to our estimates the observed rise of 14 percentage points in labour tax rates between 1965 and 1995 in the eu could account for a rise in eu unemployment of roughly 4 percentage points a reduction of the investment share of output of about 3 percentage points and a growth slowdown of about 0 4 percentage points a year francesco daveri and guido tabellini

foreign direct investment and the dark side of decentralization countries differ in their government architecture some countries are characterized by a high degree of concentration of fiscal administrative judicial executive and lawmaking powers whereas others have decentralized many functions and responsibilities of government to different jurisdictions and various levels of government the cross country differences in the organization of government are also not static but have been subject to substantial change in many countries the co existence of different organizational patterns of government has created an important debate regarding the determinants of particular government structures as well as questions regarding the optimality of different forms of organization

the stability of price dispersion under seller and consumer learning in many markets it is possible to find rival sellers charging different prices for the same good earlier research has attempted to explain this phenomenon by demonstrating the existence of dispersed price equilibria when consumers must make use of costly search to discover prices we ask whether such equilibria can be learned when sellers adjust prices adaptively in response to current market conditions with consumer behavior fixed convergence to a dispersed price equilibrium is possible in some cases however once consumer learning is introduced the monopoly outcome first found by diamond journal of economic theory3 1971 156 68 is the only stable equilibrium

expropriation and control rights a dynamic model of foreign direct investment abstract this paper studies the strategic interaction between a foreign direct investor and a host country we analyze how the investor can use his control rights to protect his investment if he faces the risk of creeping expropriation once his investment is sunk it is shown that this hold up problem may cause underinvestment if the outside option of the investor is too weak and overinvestment if it is too strong we also analyze the impact of spillover effects we give a rationale for tax holidays and we examine how stochastic returns affect the strategic interaction of investor and host country

job destruction and propagation of shocks this paper considers propagation of aggregate shocks in a dynamic general equilibrium model with labor market matching and endogenous job destruction cyclical fluctuations in the job destruction rate magnify the output effects of shocks as well as making them much more persistent interactions between capital adjustment and the job destruction rate play an important role in generating persistence propagation effects are shown to be quantitatively substantial when the model is calibrated using job flow data incorporating costly capital adjustment leads to significantly greater propagation

an empirical model of labor supply in a life cycle setting this paper formulates and estimates a structural intertemporal model of labor supply using theoretical characterizations derived from an economic model of lifetime behavior a two step empirical analysis yields estimates of intertemporal and uncompensated substitution effects which provide the information needed to predict the response of hours of work to life cycle wage growth and shifts in the lifetime wage path

structural transformation and the deterioration of european labor market outcomes this paper examines hours worked in continental europe and the united states from 1956 to 2003 the empirical work establishes two results first hours worked in europe decline by almost 45 percent compared to the united states over this period second this decline is almost entirely accounted for by the fact that europe develops a much smaller market service sector than the united states a simple model of time allocation is used to understand these patterns i find that relative increases in taxes and technological catch up can account for most of the differences between the european and american time allocations over this period

market share dynamics in a duopoly model with word of mouth communication abstract we analyze dynamic price competition in a homogeneous goods duopoly where consumers exchange information via word of mouth communication a fraction of consumers who do not learn any new information remain locked in at their previous supplier in each period we analyze markov perfect equilibria in which firms use mixed pricing strategies market share dynamics are driven by the endogenous price dispersion depending on the parameters we obtain different classes of dynamics when firms are impatient there is a tendency towards equal market shares when firms are patient there are extended intervals of market dominance interrupted by sudden changes in the leadership position

the time varying nairu and its implications for economic policy the nairu the unemployment rate consistent with a constant rate of inflation is estimated in this paper as a parameter allowed to vary over time value is determined in an econometric model where the inflation rate depends on its past values demand and supply shocks the nairu estimated for the gdp deflator varies over the past forty years within 5 4 to 6 5 percent its estimated value for the most recent quarter 1996 q2 is 5 6 percent the nairu has declined in recent years in response to global competition immigration other factors weakening labor s bargaining position and the rapidly declining prices of computers and other electronics

costly buyer search in laboratory markets with seller advertising in this experiment sellers simultaneously choose prices and advertising strategies buyers either purchase at an advertised price or search sequentially for other prices in the unique symmetric equilibrium sellers charge a high unadvertised price or advertise a price chosen from a lower interval increases in search or advertising costs raise equilibrium prices and affect equilibrium advertising intensity empirical results are consistent with most comparative static predictions sellers however price much lower and advertise more intensely than predicted consequently market outcomes more closely resemble a perfect information bertrand like equilibrium than the imperfect information mixed strategy equilibrium with significant seller market power

on the learning and stability of mixed strategy nash equilibria in games of strategic substitutes abstract this paper analyzes the learning and stability of mixed strategy nash equilibria in games of strategic substitutes gss complementing recent work done in the case of strategic complements gsc mixed strategies in gss are of particular interest because it is well known that such games need not exhibit pure strategy nash equilibria first we establish bounds on the strategy space which indicate where randomizing behavior may occur in equilibrium second we show that mixed strategy nash equilibria are generally unstable under a wide variety of learning rules multiple examples are given

technology shocks and job flows we consider a version of the solow growth model where technological progress can be investment specific or investment neutral the labour market is subject to search frictions and the existing productive units may fail to adopt the most recent technological advances technological progress can lead to the destruction of technologically obsolete jobs and cause unemployment we calibrate the model to replicate the high persistence that characterizes the dynamics of firms neutral technology and the frequency of firms capital adjustment we find that neutral technological advances increase job destruction and job reallocation and reduce aggregate employment investment specific technological advances reduce job destruction have mild effects on job creation and are expansionary hence neutral technological progress prompts schumpeterian creative destruction while investment specific technological progress operates essentially as in the standard neoclassical growth model using structural var models we provide support to the key dynamic implications of the model copyright 2007 wiley blackwell

cross country differences in unemployment fiscal policy unions and household preferences in general equilibrium we develop a five period overlapping generations model with individuals who differ by ability and with an imperfect labour market union wage setting for the individuals of lower ability the model explains human capital formation hours worked and unemployment within one coherent framework its predictions match the differences in the unemployment rate across 12 oecd countries remarkably well a shapley decomposition of these differences reveals an almost equal role for fiscal policy variables and union preferences as to fiscal policy differences in unemployment benefits play a much more important role than tax differences differences in households taste for leisure are unimportant

a theory of expropriation and deviations from perfect capital mobility there are many reasons why commodity trade fails to equate the rewards to factors of production in different countries consequently there is an incentive for factor movements between countries while movements of factors especially capital are important in the world economy they have not been sufficient to equate factor returns among countries the failure of capital flows to equate returns to capital is frequently attributed to political risks and left outside the sphere of economic analysis specifically investments abroad especially in ldc s are said to be more subject to the risk of expropriation or at least to unpredictable changes in the tax and exchange control regime adopted by the host country fears of foreign investors have often been realised williams i975 estimates that about 20 of the value of foreign investments carried into or made during i956 72 in ldc s was expropriated without compensation in this period in the past researchers in disciplines other than economics have been responsible for most of the analysis of expropriations we argue that an important set of economic considerations affect the nature of these impediments to capital mobility and this paper provides a theory of expropriation based on maximising behaviour by host countries and investors we use this theory to identify industry and national characteristics increasing the threat of expropriation and implying large deviations from equal returns on capital and to examine host country and home country policies minimising distortions from the threat of expropriation three broad conclusions follow from the analysis first the threat of expropriation can significantly distort the international allocation of capital even if the act of expropriation is relatively rare in the extreme acts of expropriation would never occur in a world of perfect foresight and rational decision making yet actions by investors to ensure that countries do not expropriate would be distorting second the ability of a country s government to expropriate foreign investments may actually reduce its welfare furthermore a host may be better off if home governments can retaliate against an expropriating country indeed an increase in the penalty imposed on an expropriating country may increase its welfare a government s power to expropriate after investments are made may alasdair smith and an associate editor made numerous valuable suggestions we would also like to thank g m grossman r w jones l a sjaastad n h stern and j e stiglitz for comments much of eaton s work on this paper was completed while he was a visitor at the graduate institute for international studies geneva an earlier version of this paper appeared under the same title as rpds

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

a note on best response dynamics we investigate the relationship between the continuous time best response dynamic its perturbed version and evolutionary dynamics in relation to mixed strategy equilibria we find that as the level of noise approaches zero the perturbed best response dynamic has the same qualitative properties as a broad class of evolutionary dynamics that is stability properties of equilibria are robust across learning dynamics of quite different origins and motivations journal of economic literature classification numbers c72 d83

job matching and propagation in the u s labor market the vacancy unemployment ratio and employment react sluggishly to productivity shocks we show that the job matching model in its standard form cannot reproduce these patterns due to excessively rapid vacancy responses extending the model to incorporate sunk costs for vacancy creation yields highly realistic dynamics creation costs induce entrant firms to smooth the adjustment of new openings following a shock leading the stock of vacancies to react sluggishly

sectoral shifts and cyclical unemployment a substantial fraction of cyclical unemployment is better characterized as fluctuations of the frictional or natural rate than as deviations from some relatively stable natural rate shifts of employment demand between sectors of the economy necessitate continuous labor reallocation since it takes time for workers to find new jobs some unemployment is unavoidable this paper presents evidence that most of the unemployment fluctuations of the seventies unlike those in the sixties were induced by unusual structural shifts within the u s economy simple time series models of layoffs and unemployment are constructed that include a measure of structural shifts within the labor market these models are estimated and a derived natural rate series is constructed

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

competition for natural resources and the hold up problem we study the role of competition for the hold up problem in foreign direct investment in resource based industries the host country government is not only unable to commit not to expropriate investment ex post but also unable to commit to the provision of local resources in the case of competition for local resources this dual commitment problem triggers higher investment levels and increases host country revenues but hurts profits of international investors

unemployment dynamics in britain we examine the inter related dynamics of the unemployment flows and stock our model allows them to be linked through the standard accounting identity but also through behavioural relationships we find that for the uk the bulk of the correlation between duration and the unemployment stock arises from the dependence of duration on unemployment taking careful account of the inter temporal identity outflow shocks have contributed little to the evolution of unemployment since the late 1960s given that the correlation of duration and unemployment arises from the behavioural relationship we show that unemployment dynamics arise mostly from shocks to the inflow unemployment remains one of europe s more pressing economic and social problems as highlighted in the eu s lisbon declaration of 2000 a dynamic approach to unemployment starts from the recognition that unemployment is a stock and changes through shocks to the outflow and inflow the research and policy focus has generally been on the outflow process or equivalently unemployment duration a glance at figure 1 shows why this might be so it reveals a very strong co movement of the unemployment rate and the proportion of the unemployed out of work for a year or more analysts have used data like this to argue that the source of unemployment fluctuations has been changes in the outflow process 1 possibly as a consequence of this most policies directed at reducing unemployment focus on improving the search effectiveness and employability of the currently unemployed the unemployment flows and stock are related in quite complex ways and in this paper we focus on these inter related dynamics the model we use allows them to be linked in two ways first there is the simple accounting relationship whereby shocks to the flows accumulate in the stock second search and matching models suggest behavioural relationships of the flows depending on unemployment the presence of the nonlinear accounting identity in the model makes the analysis of the joint system problematic so we proceed sequentially investigating first one link and then the other we find that for the uk the bulk of the correlation between duration and the unemployment stock displayed in figure 1 arises from the dependence of the former on the latter we find a strong dependence of the outflow rate on unemployment taking careful account of the inter temporal identity on the other hand outflow shocks have contributed little to the evolution of unem

revisiting dynamic duopoly with consumer switching costs abstract the degree of collusiveness of a market with consumer switching costs is analyzed in an infinite horizon model of duopolistic competition in contrast with previous analyses we assume that firms compete for the demand for a homogeneous good by setting prices simultaneously in each period this problem is formulated as a simple stochastic game and a symmetric stationary markovian perfect equilibrium with distinctive economic features is studied we show that switching costs unambiguously relax price competition in equilibrium but that on the contrary they may make tacit collusion more difficult to sustain journal of economic literature classification numbers c73 d43 l13

foreign direct investment and host country policies a rationale for using ownership restrictions abstract this paper examines host governments motivation for restricting ownership shares of multinational firms mnfs in foreign direct investment fdi projects an mnf with a productivity advantage is willing to invest in a host country the host government wants to capture the mnf s surplus yet cannot observe it due to the mnf s private information about its firm specific advantage in contrast a joint venture jv partner might observe this surplus depending on its ownership share the host government can alleviate its informational constraints by using ownership restrictions to force a jv this calls into question the wisdom of calls for liberalizing fdi flows by the wholesale elimination of domestic jv requirements we show that the optimal mechanism involves ownership restrictions that decrease as the size of the mnf s firm specific advantage increases

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

the role of shocks and institutions in the rise of european unemployment the aggregate evidence two key facts about european unemployment must be explained the rise in unemployment since the 1960s and the heterogeneity of individual country experiences while adverse shocks can potentially explain much of the rise in unemployment there is insufficient heterogeneity in these shocks to explain cross country differences alternatively while explanations focusing on labour market institutions explain current heterogeneity well many of these institutions pre date the rise in unemployment based on a panel of institutions and shocks for 20 oecd nations since 1960 we find that the interaction between shocks and institutions is crucial to explaining both stylised facts

engines of liberation electricity was born at the dawn of the last century households were inundated with a flood of new consumer durables what was the impact of this consumer durable goods revolution it is argued here that the consumer goods revolution was conducive to liberating women from the home to analyse this hypothesis a beckerian model of household production is developed households must decide whether or not to adopt the new technologies and whether a married woman should work can such a model help to explain the rise in married female labour force participation that occurred in the last century yes the housewife of the future will be neither a slave to servants nor herself a drudge she will give less attention to the home because the home will need less she will be rather a domestic engineer than a domestic labourer with the greatest of all handmaidens electricity at her service this and other mechanical forces will so revolutionize the woman s world that a large portion of the aggregate of woman s energy will be conserved for use in broader more constructive fields thomas alva edison as interviewed in good housekeeping magazine lv no 4 october 1912 p 436

equilibrium price distributions equilibrium price distributions for a homogeneous product consistent with individual incentives are investigated they arise in informationally imperfect markets in which the only primitive datum is the distribution of search costs it is shown that single multi and continuous price distributions are all viable long run phenomena depending on the nature of search costs a method for computing equilibrium price distributions is also provided jevons law of one price has long been an accepted dictum in economic theory in a classroom presentation it still serves sometimes implicitly as a major premise in many micro models of market interaction much of the descriptive theory as well as welfare analysis hinges on this assumption yet one s day to day experience reveals that price differentials are a viable phenomenon and that looking for lower prices may very well be a rewarding activity the prospects of eventually hitting a bargain and the resulting price reduction would more than compensate for the cost incurred during the search process moreover the existence of price dispersions appear to be an empirically stable phenomenon snapshots of markets for relatively homogeneous products reveal substantial and recurring price differentials stigler 1961 and pratt wise and zeckhauser 1979 for example report some evidence supporting this claim an important article by stigler 1961 focused economists attention on the crucial role played by the informational structure of markets it gave rise to the study of the

job search and cyclical unemployment a model economy is described that integrates job search and signal extraction analysis equilibrium differs from search models without signal extraction in that even with a fixed real sector unemployment fluctuates stochastically it differs from standard signal extraction models because search introduces persistence in fact unemployment follows a second order difference equation with coefficient that are functions of current and lagged values of the stochastic shocks thus the model has the potential to mimic actual business cycle data despite the fact that the underlying shocks are independently and identically distributed policy implications are discussed

adaptive learning models of consumer behavior abstract in a model of dynamic duopoly optimal price policies are characterized assuming consumers learn adaptively about the relative quality of the two products a contrast is made between belief based and reinforcement learning under reinforcement learning consumers can become locked into the habit of purchasing inferior goods such lock in permits the existence of multiple history dependent asymmetric steady states in which one firm dominates in contrast belief based learning rules must lead asymptotically to correct beliefs about the relative quality of the two brands and so in this case there is a unique steady state

search market equilibrium bilateral heterogeneity and repeat purchases abstract we develop a general model of search market equilibrium with heterogeneous buyers and sellers this framework unifies previous models with one sided heterogeneity and clarifies many of their special properties it easily accounts for price dispersion active search and the matching of buyer and seller types it also extends to repeat purchases once we embed it into a dynamic game with incomplete information we formalize the inferences and strategies underlying equilibria where firms charge constant prices and customers patronize them loyally we establish a general correspondence between such equilibria and single purchase markets journal of economic literature classification numbers d83 l13

who is afraid of political risk multinational firms and their choice of capital structure this paper investigates how multinational firms choose the capital structure of their foreign affiliates in response to political risk we focus on two choice variables the leverage and the ownership structure of the foreign affiliate and we distinguish different types of political risk such as expropriation unreliable intellectual property rights and confiscatory taxation in our theoretical analysis we find that as political risk increases the ownership share tends to decrease whereas leverage can both increase or decrease depending on the type of political risk using the microdatabase direct investment of the deutsche bundesbank we find supportive evidence for these different effects

learning in games with unstable equilibria we propose a new concept for the analysis of games the tasp which gives a precise prediction about non equilibrium play in games whose nash equilibria are mixed and are unstable under fictitious play like learning we show that when players learn using weighted stochastic fictitious play and so place greater weight on recent experience the time average of play often converges in these unstable games even while mixed strategies and beliefs continue to cycle this time average the tasp is related to the cycle identified by shapley l s shapley some topics in two person games in m dresher et al eds advances in game theory princeton university press princeton 1964 the tasp can be close to or quite distinct from nash equilibrium

what drives the global land rush the authors review evidence regarding the size and evolution of the land rush in the wake of the 2007 8 boom in agricultural commodity prices and authors study the determinants of foreign land acquisition for large scale agricultural investment the use of data on bilateral investment relationships to estimate gravity models of transnational land intensive investments confirms the central role of agro ecological potential as a pull factor however this finding contrasts the standard literature insofar as the quality of the destination country s business climate is insignificant and weak tenure security is associated with increased interest for investors to acquire land in the country policy implications are discussed

expropriation risk and technology abstract this paper develops a unified framework to analyze the dynamics of firm investment in countries with poor legal enforcement the firm s technology edge over the government generates endogenous property rights industry variation in the technology gap predicts a sectoral pecking order of expropriations long run investment distortions may be pareto superior relative to persistent investment at the static optimum the dynamics of investment and transfers depend on whether incentives backloading or efficiency frontloading concerns dominate at the initial division of surplus an increase in government efficiency may reduce its welfare the model provides a technology driven rationale for the widespread use of conglomerate structures in emerging market countries

instability of endogenous price dispersion equilibria a simulation models of price posting by firms and search by consumers such as burdett and judd 1983 often feature equilibria with endogenous price dispersion however such equilibria are strategically fragile in order to investigate how robust they are in the absence of an external coordination mechanism i simulate various protocols firms may use to update their prices despite firms being myopic some protocols yield results close to the benchmark model if firms rush to update before observing competitors actions profits are higher on average but volatile and cyclical with cost dispersion prices become more stable as they are more closely tied to costs all results are robust to moderate menu costs

labor hoarding and the business cycle this paper investigates the sensitivity of solow residual based measures of technology shocks to labor hoarding behavior using a structural model of labor hoarding and the identifying restriction that innovations to technology shocks are orthogonal to innovations in government consumption we estimate the fraction of the variability of the solow residual that is due to technology shocks our results support the view that a significant proportion of movements in the solow residual are artifacts of labor hoarding behavior specifically we estimate that the variance of innovations to technology is roughly 50 percent less than that implied by standard real business cycle models in addition our results suggest that existing real business cycle studies substantially overstate the extent to which technology shocks account for the variability of postwar aggregate u s output

unemployment and hours of work the north atlantic divide revisited i examine the dynamic evolutions of unemployment hours of work and the service share since the war in the united states and europe the theoretical model brings together all three and emphasizes technological growth computations show that the very low unemployment in europe in the 1960s was due to the high productivity growth associated with technological catch up productivity also played a role in the dynamics of hours but a full explanation for the fast rise of service employment and the big fall in aggregate hours needs further research taxation has played a role but results are mixed

too much investment a problem of endogenous outside options this paper shows that when agents on both sides of the market are heterogeneous varying in their costs of investment ex ante investments by firms and workers or buyers and sellers more generally may be too high when followed by stochastic matching and bargaining over quasi rents the overinvestment is caused by the fact that low cost agents by investing more can increase the value of their outside option and thus shift rent away from high cost investors numerical simulations show that overinvestment can occur given parameter values calibrated to oecd labour markets

equilibrium in a production economy with an income tax this paper develops a method to study an infinite horizon production economy distorted by a state dependent income tax this setting permits taxes to depend on the capital stock an endogenous state variable and thus captures situations where the evolution for capital and taxes is jointly determined to solve this model the consumption function is represented as a fixed point of a nonlinear monotone operator that is defined such that its nth iteration computes the consumption function n steps away from the horizon for a corresponding finite horizon economy the oparator s monotonicity is exploited in proving the existence of and constructing an equilibrium copyright 1991 by the econometric society

on the dynamic stability of a price dispersion model using gradient dynamics abstract this paper studies the evolutionary stability of a unique nash equilibrium in a price dispersion model burdett and judd 1983 using gradient dynamics the numerical solution to the partial differential equation that governs the evolution of prices shows that the stationary equilibrium is not a nash equilibrium and that it differs from the cyclical behavior predicted by another family of dynamics such as replicator and logit in a continuous action space

the impact of tfp growth on steady state unemployment theoretical predictions of the impact of total factor productivity tfp growth on unemployment are ambiguous and depend on the extent to which new technology is embodied in new jobs we evaluate a model with embodied and disembodied technology capitalization and creative destruction effects in econometric estimates with a panel of industrial countries we find a large negative impact of tfp growth on unemployment which implies that embodied technology and creative destruction play no role in the steady state dynamics of unemployment capitalization effects explain some of the estimated impact but a part remains unexplained

business cycles and labor market search the quantitative implications of labor market search for economic fluctuations are evaluated in the context of a real business cycle model incorporating labor market search into the model is found to improve its empirical performance along several dimensions in particular hours now fluctuate substantially more than wages and the contemporaneous correlation between hours and productivity falls in addition the model replicates the observation that output growth displays positive autocorrelation at short horizons overall the empirical results suggest that the labor market search environment embodies a quantitatively important propagation mechanism copyright 1996 by american economic association

unemployment insurance and unemployment spells this paper tests the effects of the level and length of unemployment insurance benefits on unemployment durations the paper particularly studies individual behavior during the weeks just prior to when benefits lapse higher unemployment insurance benefits are found to have a strong negative effect on the probability of leaving unemployment however the probability of leaving unemployment rises dramatically just prior to when benefits lapse individual data are used with accurate information of spell durations and the level and length of benefits the semiparametric estimation techniques used in the paper yield more plausible estimates than conventional approaches and provide useful diagnostics copyright 1990 by the econometric society

bargaining frictions labor income taxation and economic performance abstract this paper is an attempt to explain differences in economic performance between a subset of oecd countries we classify countries in terms of their degree of rigidity in the labor market and use a matching model with labor leisure choice bargaining frictions and labor income taxation to capture these rigidity differences added flexibility improves economic performance in different ways depending on whether income taxation is high or low feeding income taxation rates estimated from the countries at hand we find that the model is able to replicate the observed rigidity levels the model is also shown to reproduce well cross country differences in non employment population ratios and the share of part time jobs in the absence of rigidity differences taxation shows little promise to replicate cross country differences as it has insufficient quantitative effects on production and productivity however the interaction of rigidity and income taxation is crucial in explaining the empirical patterns of the non employment rate and of the share of part time jobs

an experimental study of price dispersion abstract we report an experiment examining a simple clearinghouse model that generates price dispersion according to this model price dispersion arises because of consumer heterogeneity some consumers are informed and simply buy from the firm offering the lowest price while the remaining consumers are captive and shop based on considerations other than price in our experiment we observe substantial and persistent price dispersion we find that as predicted an increase in the fraction of informed consumers leads to more competitive pricing for all consumers we also find as predicted that when more firms enter the market prices to informed consumers become more competitive while prices to captive customers become less competitive thus our experiment provides strong support for the model s comparative static predictions about how changes in market structure affect pricing

structural change in advanced nations a new set of stylised facts we provide new evidence on patterns of structural change in advanced economies reconsidering the stylised facts put forward by kaldor 1963 kuznets 1971 and maddison 1980 since 1980 the services sector has overwhelmingly predominated in the economic activity of the european union japan and the us but there is substantial heterogeneity among services personal finance and business services have low productivity growth and increasing shares in employment and gdp by contrast shares of distribution services are constant and productivity growth is rapid we find that the labour share in value added is declining while the use of ict capital and skilled labour is increasing in all sectors and regions

the dynamics of price dispersion or edgeworth variations abstract hypotheses on the dynamics of dispersed prices are extracted from computer simulations and theory and are tested using laboratory data as predicted in some variations of the edgeworth hypothesis the data exhibit a significant cycle relative to the unique stationary distribution the empirical distribution of posted prices has excess mass in an interval that declines until it approaches the lower boundary of the stationary distribution then jumps upward and the downward cycle resumes the amplitude of the cycle seems fairly constant over the longer experimental sessions a hybrid of gradient dynamics and logit dynamics seems to best reproduce the observed dynamics

buyer search and price dispersion a laboratory study we study markets with costly buyer search in which sellers simultaneously post prices buyers costlessly observe one or with probability 1 q two of the posted prices and can accept one or pay to search again the experiment varies q the search cost and the number of buyers equilibrium theory predicts a unified very low high price for q 0 q 1 and predicts specific distributions of dispersed prices for q 1 3 and 2 3 actual prices conform closely to the predictions in some treatments buyers reservation prices are biased away from the extremes however and sellers prices have positive autocorrelation and cross sectional correlation

unemployment insurance and cultural transmission theory and application to european unemployment this paper emphasizes the two way causality between the provision of unemployment insurance and the cultural transmission of work ethic values affect the size of the moral hazard problem and hence the policy to be implemented conversely when parents rationally choose how much effort to exert to raise their children to work hard they form expectations on the policy that will be implemented by the next generation in this context we show that the different cultural traits are complementary and that there is some cultural heterogeneity in all steady state equilibria the model could generate a lag between the introduction of unemployment insurance and a deterioration of the work ethic relying on a calibration we argue that it can account for a substantial fraction of the history of european unemployment since world war ii as our explanation is compatible with the co existence of generous unemployment insurance and low unemployment in the 1950s and 1960s it could be seen as an alternative to the dominant story that relies on the occurrence of large shocks since the 1970s supportive empirical evidence is provided

the dynamic instability of dispersed price equilibria abstract we adopt an evolutionary framework to explain price dispersion as a time varying phenomenon by developing a finite strategy analogue of the burdett and judd 1983 price dispersion model we show that all dispersed price equilibria are unstable under the class of perturbed best response dynamics instead numerical simulations using the logit dynamic show that price dispersion manifests itself as a limit cycle we verify that limit cycles persist even when the finite strategy model approaches the original continuous strategy model for a particularly simple case of the model we prove the existence of a limit cycle

strategic complementarities and search market equilibrium abstract in this paper we apply supermodular game theory to the equilibrium search literature with sequential search we identify necessary and sufficient conditions for the pricing game to exhibit strategic complementarities and prove existence of equilibrium we then show that price dispersion is inherently incompatible with strategic complementarities in the sense that the diamond paradox obtains when firms are identical and is robust within the class of search cost densities that are small near zero and support strategic complementarities we also show that a major criticism of the literature that agents act as if they know the distribution of prices can be justified in the sense of convergent best response dynamics

learning mixed equilibria we study learning processes for finite strategic form games in which players use the history of past play to forecast play in the current period in a generalization of fictitious play we assume only that players asymptotically choose best responses to the historical frequencies of opponents past play this implies that if the stage game strategies converge the limit is a nash equilibrium in the basic model plays seems unlikely to converge to a mixed strategy equilibrium but such convergence is natural when the stage game is perturbed in the manner of harsanyi s purification theorem journal of economic literature classification number c72

business cycles with costly search and recruiting a business cycle model is developed in which output is traded on lucas phelps islands and labor services on each island are exchanged through costly search and recruiting with transactions externalities the model exhibits persistent involuntary unemployment and inefficient equilibria even though there are no nominal rigidities and no unexploited privately attainable gains from trade it also exhibits employment fluctuations without any real wage fluctuations it yields a lucas aggregate supply curve to a linear approximation it also implies that the natural rate of unemployment depends positively upon the variability and persistence of relative price shocks

real business cycles in this paper we demonstrate how certain very ordinary economic principles lead maximizing individuals to choose consumption production plans that display many of the characteristics commonly associated with business cycles our explanation is entirely consistent with i rational expectations ii complete current information iii stable preferences iv no technological change v no long lived commodities vi no frictions or adjustment costs vii no government viii no money and ix no serial dependence in the stochastic elements of the environment we also provide a completely worked out example of the type of artificial economy we have in mind the time series properties of the example exhibit some major features of observed business cycles although this type of model may not be capable of explaining all of the regularities in actual business cycles we believe that it provides a useful well defined benchmark for assessing the relative importance of factors e g monetary disturbances

employment and hours of work abstract this paper develops a dynamic model of the labor market in which the degree of substitution between employment and hours of work is determined as part of a search equilibrium each firm chooses its demand for working hours and number of vacancies and the earnings profile is determined by nash bargaining the earnings profile is generally nonlinear in hours of work and defines the trade off between employment and hours of work concave production technology induces firms to overemploy and as a result hours of work are below their optimal level the hosios condition is not sufficient for efficiency when there are two industries workers employed by firms with higher recruitment costs work longer and earn more that is good jobs require longer hours of work interestingly technology differentials cannot account for working hours differentials