Aggregate Hiring And The Value Of Jobs Along The Business Cycle

Labor Markets and Business Cycles integrates search and matching theory with the neoclassical growth model to better understand labor market outcomes. Robert Shimer shows analytically and quantitatively that rigid wages are important for explaining the volatile behavior of the unemployment rate in business cycles. The book focuses on the labor wedge that arises when the marginal rate of substitution between consumption and leisure does not equal the marginal product of labor. According to competitive models of the labor market, the labor wedge should be constant and equal to the labor income tax rate. But in U.S. data, the wedge is strongly countercyclical, making it seem as if recessions are periods when workers are dissuaded from working and firms are dissuaded from hiring because of an increase in the labor income tax rate. When job searches are time consuming and wages are flexible, search frictions--the cost of a job search--act like labor adjustment costs, further exacerbating inconsistencies between the competitive model and data. The book shows that wage rigidities can reconcile the search model with the data, providing a quantitatively more accurate depiction of labor markets, consumption, and investment dynamics. Developing detailed search and matching models, Labor Markets and Business Cycles will be the main reference for those interested in the intersection of labor market dynamics and business cycle research.

"Economists often analyze economies populated by identical agents due to their tractability. However, this practice leads to discrepancies between individual and aggregate level observations. Most prominently, these models overlook large differences in behavior and outcomes across workers. This dissertation fills this gap by examining the implications of individual employment and turnover patterns for the aggregate labor market. The first chapter of this dissertation analyzes turnover differences across workers over the business cycle and their implications for overall job duration. Evidence from the National Longitudinal Survey of The Youth (NLSY) 1979-2006 suggests that average (overall) job duration is pro-cyclical, once controlling for worker composition. At the exit margin, jobs ending in recessions are of systematically shorter duration than jobs ending in booms. This result however is driven by high turnover workers who disproportionately account for exits in a recession. At the entry margin, jobs starting in recessions are expected to be of shorter duration. This result is not compositional. Recessions tend to increase the likelihood of any new job ending even when accounting for worker heterogeneity. The second chapter of this dissertation explores the implications of individual labor supply heterogeneity for the aggregate labor supply elasticity. It presents a heterogeneous agent economy with indivisible labor where agents differ in their disutility of labor and market skills. The model is estimated via indirect inference using observations on average employment and wage rates across individuals in the NLSY. The elasticity of aggregate employment in the model is 0.71, which is low compared to the literature. The results suggest that the previous literature generates large aggregate labor supply elasticities by ignoring individual labor supply differences. The third chapter is a natural extension of the second. It addresses what are the resulting aggregate employment fluctuations in an economy where agents differ in their labor supply. The results of this chapter suggest that allowing for individual labor supply heterogeneity has profound cyclical effects. The model predicts that aggregate employment fluctuations are small because individuals with very inelastic labor supply contribute disproportionately to overall employment over the business cycle"--Leaves v-vi.

During prolonged economic recessions when the normal cyclical expansion of output fails to materialize, the topic of the 'cyclical behaviour of wages' has emerged as an area of debate. In 1985, the British Treasury claimed that academic studies into the cyclical behaviour of wages demonstrated that a cut in wages would increase employment. Wages in the Business Cycle contests this argument by presenting the results of original, empirical work which illustrates the absence of any systematic empirical regularity to wage movements over the business cycle. Jonathan Michie argues that the re-emergence of this debate must be seen within the context of the theory of the 'labour demand function', representing an attempt to challenge the Keynesian theoretical assumptions implicit in the bulk of applied macro economic work up to the late 1970s.

Designing a good unemployment insurance scheme is a delicate matter. In a system with no or little insurance, households may be subject to a high income risk, whereas excessively generous unemployment insurance systems are known to lead to high unemployment rates and are costly both from a fiscal perspective and for society as a whole. Andreas Pollak investigates what an optimal unemployment insurance system would look like, i.e. a system that constitutes the best possible compromise between income security and incentives to work. Using theoretical economic models and complex numerical simulations, he studies the effects of benefit levels and payment durations on unemployment and welfare. As the models allow for considerable heterogeneity of households, including a history-dependent labor productivity, it is possible to analyze how certain policies affect individuals in a specific age, wealth or skill group. The most important aspect of an unemployment insurance system turns out to be the benefits paid to the long-term unemployed. If this parameter is chosen too high, a large number of households may get caught in a long spell of unemployment with little chance of finding work again. Based on the predictions in these models, the so-called "Hartz IV" labor market reform recently adopted in Germany should have highly favorable effects on the unemployment rates and welfare in the long run.

"Adapted from Macroeconomics, Second edition by Paul Krugman and Robin Wells."

OECD's annual report on employment markets and prospects. This 2009 edition includes chapters on how the crisis has effected employment, job and worker flows, poverty, and pathways onto and off of disability benefits.

We build a small open economy, real business cycle model with labor market frictions to evaluate the role of employment protection in shaping business cycles in emerging economies. The model features matching frictions and an endogenous selection effect by which inefficient jobs are destroyed in recessions. In a quantitative version of the model calibrated to the Mexican economy we find that reducing separation costs to a level consistent with developed economies would reduce output volatility by 15 percent. We also use the model to analyze the Mexican crisis episode of 2008 and conclude that an economy with lower separation costs would have experienced a smaller drop in output and in measured total factor productivity with no significant change in aggregate employment.

We propose a highly tractable way of analyzing business cycles in an environment with random job search both off- and and on-the-job (OJS). Ex post heterogeneity in productivity across jobs generates a job ladder. Firms Bertrand-compete for employed workers, as in the Sequential Auctions protocol of Postel-Vinay and Robin (2002).We identify three channels through which OJS amplifies and propagates aggregate shocks: (i) a higher estimated elasticity of the matching function, when recognizing that at least half of all hires are from other employers; (ii) the differential returns to hiring employed and unemployed job applicants, whose proportions naturally vary over the business cycle; (iii) within employment, the slow reallocation of workers through OJS across rungs of the job ladder, generating endogenous, slowly evolving opportunities for further poaching, which feed back on job creation incentives.Endogenous job destruction, due to either aggregate or idiosyncratic shocks, is countercyclical and thus raises the cyclical volatility of unemployment, closer to its empirical value; but it also stimulates job creation in recessions, to take advantage of the fresh batch of unemployed, and tilts the Beveridge curve up. OJS corrects this tendency and restores a vacancy-unemployment trade-off more in line with empirical observations.