Labor Market Search Model Research Articles

Learning on the Job and the Cost of Business Cycles

We show that business cycles reduce welfare through a decrease in the average level of employment in a labor market search model with learning on the job and skill loss during unemployment. Empirically, unemployment and the job-finding rate are negatively correlated. Since new jobs are the product of these two from the employment transition equation, business cycles imply fewer new jobs. Learning on the job implies that the resulting decrease in employment reduces aggregate human capital. This reduces incentives to post vacancies, further decreasing employment and human capital. We quantify this mechanism and find large output and welfare costs of business cycles. (JEL D83, E23, E24, E32, J24, J63)

Equilibrium Labor Market Search and Health Insurance Reform

We present and empirically implement an equilibrium labor market search model where risk averse workers facing medical expenditure shocks are matched with firms making health insurance coverage decisions. Our model delivers a rich set of predictions that can account for a wide variety of phenomenon observed in the data including the correlations among firm sizes, wages, health insurance offering rates, turnover rates and workers' health compositions. We estimate our model by Generalized Method of Moments using a combination of micro data sources including Survey of Income and Program Participation (SIPP), Medical Expenditure Panel Survey (MEPS) and Robert Wood Johnson Foundation Employer Health Insurance Survey. We use our estimated model to evaluate the equilibrium impact of the 2010 Affordable Care Act (ACA) and find that it would reduce the uninsured rate among the workers in our estimation sample from 20.12% to 7.27%. We also examine a variety of alternative policies to understand the roles of different components of the ACA in contributing to these equilibrium changes. Interestingly, we find that the uninsured rate will be even lower (at 6.44%) if the employer mandate in the ACA is eliminated.

The effects of productivity and benefits on unemployment: Breaking the link

In the standard macroeconomic search and matching model of the labor market, there is a tight link between the quantitative effects of (i) aggregate productivity shocks on unemployment and (ii) unemployment benefits on unemployment. This tight link is at odds with the empirical literature. We show that a two-sided model of labor market search where the household and firm decisions are decomposed into job offers, job acceptances, firing, and quits can break this link. In such a model, unemployment benefits affect households' behavior directly, without having to run via the bargained wage. A calibration of the model based on U.S. JOLTS data generates both a solid amplification of productivity shocks and a moderate effect of benefits on unemployment. Our analysis shows the importance of investigating the effects of policies on the households' work incentives and the firms' employment incentives within the search process.

Learning on the Job and the Cost of Business Cycles

We show that business cycles reduce welfare through a decrease in the average level of employment in a labor market search model with learning on-the-job and skill loss during unemployment. A negative correlation between unemployment and vacancies implies, via the concavity of the matching function, that business cycles reduce the average number of new jobs and employment. Learning on-the-job implies that the decrease in employment reduces aggregate human capital. This, in turn, reduces the incentives to post vacancies, further decreasing employment and human capital. We quantify this mechanism and nd large output and welfare costs of business cycles.

What Hides Behind the German Labor Market Miracle? Unemployment Insurance Reforms and Labor Market Dynamics

A key question in labor market research is how the unemployment insurance system affects unemployment rates and labor market dynamics. We revisit this old question studying the German Hartz reforms. On average, lower separation rates explain 76% of declining unemployment after the reform, a fact unexplained by existing research focusing on job finding rates. The reduction in separation rates is heterogeneous, with long-term employed, high-wage workers being most affected. We causally link our empirical findings to the reduction in long-term unemployment benefits using a heterogeneous-agent labor market search model. Absent the reform, unemployment rates would be 50% higher today.

Dynamics of the Planning Solution in the Textbook Model of Labor Market Search and Matching

This paper takes a discrete-time adaptation of the continuous-time matching economy of Pissarides (1990, 2001) discussed in Ljungqvist and Sargent (2000) and computes the solution to the dynamic planning problem. The solution is shown to be completely characterized by a first-order, non-linear map which admits a unique stationary solution that is dynamically unapproachable from an arbitrary set of initial conditions. Oscillatory solutions are possible but there is no possibility of periodic solutions.

Equilibrium Labor Market Search and Health Insurance Reform, Second Version

We present and empirically implement an equilibrium labor market search model where risk averse workers facing medical expenditure shocks are matched with firms making health insurance coverage decisions. Our model delivers a rich set of predictions that can account for a wide variety of phenomenon observed in the data including the correlations among firm sizes, wages, health insurance offering rates, turnover rates and workers' health compositions. We estimate our model by Generalized Method of Moments using a combination of micro datasets including Survey of Income and Program Participation, Medical Expenditure Panel Survey and Robert Wood Johnson Foundation Employer Health Insurance Survey. We use our estimated model to evaluate the equilibrium impact of the 2010 Affordable Care Act (ACA) and find that it would reduce the uninsured rate among the workers in our estimation sample from about 22% in the pre-ACA benchmark economy to less than 4%. We also find that income-based premium subsidies for health insurance purchases from the exchange play an important role for the sustainability of the ACA; without the premium subsidies, the uninsured rate would be around 18%. In contrast, as long as premium subsidies and health insurance exchanges with community ratings stay intact, ACA without the individual mandate, or without the employer mandate, or without both mandates, could still succeed in reducing the uninsured rates to 7.34%, 4.63% and 9.22% respectively.

Editors’ Introduction

Editors’ Introduction

Equilibrium Labor Market Search and Health Insurance Reform

We present and empirically implement an equilibrium labor market search model where risk averse workers facing medical expenditure shocks are matched with firms making health insurance coverage decisions. Our model delivers a rich set of predictions that can account for a wide variety of phenomenon observed in the data including the correlations among firm sizes, wages, health insurance offering rates, turnover rates and workers' health compositions. We estimate our model by Generalized Method of Moments using a combination of micro data sources including Survey of Income and Program Participation (SIPP), Medical Expenditure Panel Survey (MEPS) and Robert Wood Johnson Foundation Employer Health Insurance Survey. We use our estimated model to evaluate the equilibrium impact of the 2010 Affordable Care Act (ACA) and find that it would reduce the uninsured rate among the workers in our estimation sample from 20.12% to 7.27%. We also examine a variety of alternative policies to understand the roles of different components of the ACA in contributing to these equilibrium changes.Interestingly, we find that the uninsured rate will be even lower (at 6.44%) if the employer mandate in the ACA is eliminated.

DIAGNOSING LABOR MARKET SEARCH MODELS: A MULTIPLE-SHOCK APPROACH

We construct a multiple-shock, discrete-time version of the Mortensen–Pissarides labor market search model to investigate the basic model's well-known tendency to underpredict the volatility of key labor market variables. In addition to the standard labor productivity shock, we introduce shocks to matching efficiency and job separation. We estimate the multiple-shock model and then simulate its properties. Although it generates significantly more volatility while preserving the Beveridge curve relationship, the multiple-shock model generates counterfactual implications for the cyclicality of job separations. Using a business cycle accounting approach, next we show that the model requires significantly procyclical and volatile matching efficiency and counterfactually procyclical job separations to render the observed data without error. We conjecture that the basic Mortensen–Pissarides model lacks mechanisms to generate sufficiently strong labor market reallocation over the business cycle, and suggest nontrivial labor force participation and job-to-job transitions as promising avenues of research.

INFLATION DYNAMICS AND LABOR MARKET SPECIFICATIONS: A BAYESIAN DYNAMIC STOCHASTIC GENERAL EQUILIBRIUM APPROACH FOR JAPAN'S ECONOMY

Which labor market specification is better able to describe inflation dynamics, a widely used sticky wage model or a recently investigated labor market search model? Using a Bayesian likelihood approach, we estimate these two models with Japan's data. This article shows that the labor market search model is superior to the sticky wage model in terms of both marginal likelihood and out‐of‐sample forecast performance, particularly regarding inflation. The labor market search model is better able to replicate the cross‐correlation among inflation, real wages, and output in the data. Moreover, in this model, real marginal cost is determined by both hiring cost and unit labor cost that varies with employment fluctuations, which gives rise to a high contemporaneous correlation between inflation and real marginal cost as represented in the New Keynesian Phillips curve. (JEL E24, E32, E37)

The Labor Market Consequences of Adverse Financial Shocks

The recent financial crises, alongside a dramatic rise in unemployment on both sides of the Atlantic, suggest that financial shocks do translate into the labor markets. In this paper we first document that financial recessions amplify labor market volatility and Okun's elasticity over the business cycle. Second, we highlight a key mechanisms linking financial shocks to job destruction, presenting and solving a simple model of labor market search and endogenous finance. While finance increases job creation and net output in normal times, it also augments their aggregate response in the aftermath of a financial shock. Third, we present evidence coherent with the idea that more leveraged sectors experience larger employment volatility during financial recessions. Theoretically, the job destruction effect of finance works as follows. Leveraged firms may find them- selves in a position in which their liquidity is suddenly called back by the lender. This has direct consequences on a firm ability to run and manage e xisting jobs. As a result, firms may be obliged to shut down part of their operations and destroy existing jobs. We argue that with well developed capital markets, firms will have an incentive to rely more on liquidity, and in normal times deep capital markets lead to tight labor markets. After an adverse liquidity shock, firms that rely much on liquidity, are hit disproportionally hard. This may explain why the unemployment rate in the US during the Great Recession increased more than in European countries experiencing larger output losses. Empirically, the paper uses a variety of datasets to test the implications of the model. At first we identify crises that, just like in the model, caused a sudden reduction of liquidity to firms. Next we draw on sector-level data on employment and leverage in a number of OECD countries at quarterly frequencies to assess whether highly leveraged equilibria originate more employment adjustment under financial recessions. We find that highly leveraged sectors and periods are associated with higher employment-to-output elasticities during banking crises and this effect explains the observation of higher Okun's elasticities during financial recessions. We also argue that the effect of leverage on employment adjustment can be interpreted as a causal effect, if our identification assumptions are considered plausible. All this amounts essentially for a test of the labor demand channel of adjustment. keywords: credit squeeze,matching,leverage JEL codes: G01,J23,J63

Business Cycles in the Equilibrium Model of Labor Market Search and Self-Insurance

The author introduces risk-averse preferences, labor-leisure choice, capital, individual productivity shocks, and market incompleteness to the standard Mortensen-Pissarides model of search and matching and explore the model's cyclical properties. There are four main findings. First and foremost, the baseline model can generate the observed large volatility of unemployment and vacancies with a realistic replacement ratio of the unemployment insurance benefits of 64 percent. Second, labor-leisure choice plays a crucial role in generating the large volatilities; additional utility from leisure when unemployed makes the value of unemployment close to the value of employment, which is crucial in generating a strong amplification, even with the moderate replacement ratio. Besides, it contributes to the amplification through an adjustment in the intensive margin of labor supply. Third, the borrowing constraint or uninsured individual productivity shocks do not significantly affect the cyclical properties of unemployment and vacancies: Most workers are well insured only with self-insurance. Fourth, the model better replicates the business cycle properties of the U.S. economy, thanks to the co-existence of adjustments in the intensive and extensive margins of labor supply and the stronger amplification.

Business Cycles in the Equilibrium Model of Labor Market Search and Self-Insurance

The author introduces risk-averse preferences, labor-leisure choice, capital, individual productivity shocks, and market incompleteness to the standard Mortensen-Pissarides model of search and matching and explore the model's cyclical properties. There are four main findings. First and foremost, the baseline model can generate the observed large volatility of unemployment and vacancies with a realistic replacement ratio of the unemployment insurance benefits of 64 percent. Second, labor-leisure choice plays a crucial role in generating the large volatilities; additional utility from leisure when unemployed makes the value of unemployment close to the value of employment, which is crucial in generating a strong amplification, even with the moderate replacement ratio. Besides, it contributes to the amplification through an adjustment in the intensive margin of labor supply. Third, the borrowing constraint or uninsured individual productivity shocks do not significantly affect the cyclical properties of unemployment and vacancies: Most workers are well insured only with self-insurance. Fourth, the model better replicates the business cycle properties of the U.S. economy, thanks to the co-existence of adjustments in the intensive and extensive margins of labor supply and the stronger amplification.

Diagnosing Labor Market Search Models: A Multiple-Shock Approach

This paper constructs a multiple-shock version of the Mortensen-Pissarides labor market search model to investigate the basic model's well-known tendency to under predict the volatility of key labor market variables. Data on U.S. job finding and job separation probabilities are used to help estimate the parameters of a three-dimensional shock process comprising labor productivity, job separation, and matching or 'allocative' efficiency. The authors show that the Mortensen-Pissarides labor market search model requires significantly procyclical and volatile job separations to simultaneously account for high procyclical variations in jobfinding probabilities as well as relatively small net employment changes. Hence, the model is more fundamentally flawed than its inability to amplify shocks would suggest. This leads the authors to conclude that the model lacks mechanisms to generate procyclical matching efficiency and labor force reallocation. As for the latter, the authors conjecture that nontrivial labor force participation and job-to-job transitions are promising avenues of research.

Household search and health insurance coverage

Abstract Health insurance in the United States is typically acquired through an employer-sponsored program. Often employees offered employer-provided health insurance have the option to extend coverage to their spouse and dependents. We investigate the implications of the “publicness” of health insurance coverage for the labor market careers of spouses. The theoretical innovations in the paper are to extend the standard partial–partial equilibrium labor market search model to a multiple searcher setting with the inclusion of multi-attribute job offers, with some of the attributes treated as public goods within the household. The model is estimated using data from the Survey of Income and Program Participation (SIPP) using a Method of Simulated Moments (MSM) estimator. We demonstrate how previous estimates of the marginal willingness to pay (MWP) for health insurance based on cross-sectional linear regression estimators may be seriously biased due to the presence of dynamic selection effects and misspecification of the decision-making unit.

Quits, Worker Recruitment, and Firm Growth: Theory and Evidence

The authors use establishment data from the Job Openings and Labor Turnover Survey (JOLTS) to study the micro-level behavior of worker quits and their relation to recruitment and establishment growth. They find that quits decline with establishment growth, playing the most important role at slowly contracting firms. They also find a robust, positive relationship between an establishment's reported hires and vacancies and the incidence of a quit. This relationship occurs despite the finding that quits decline, and hires and vacancies increase, with establishment growth. The authors characterize these dynamics within a labor-market search model with on-the-job search, a convex cost of creating new positions, and multi-worker establishments. The model distinguishes between recruiting to replace a quitting worker and recruiting for a new position, and relates this distinction to firm performance. Beyond giving rise to a varying quit propensity, the model generates endogenously determined thresholds for firm contraction (through both layoffs and attrition), worker replacement, and firm expansion. The continuum of decision rules derived from these thresholds produces rich firm-level dynamics and quit behavior that are broadly consistent with the empirical evidence of the JOLTS data.

Matching Externalities and Inventive Productivity

This paper generalizes and extends the labor market search and matching model of Berliant, Reed, and Wang (2006). In this model, the density of cities is determined endogenously, but the matching process becomes more efficient as density increases. As a result, workers become more selective in their matches, and this raises average productivity (the intensive margin). Despite being more selective, the search process is more rapid so that workers spend more time in productive matches (the extensive margin). The effect of an exogenous increase in land area on productivity depends on the sensitivity of the matching function and congestion costs to changes in density.

Labor Market Search and Optimal Retirement Policy

A popular and long‐standing view is that social security is a means for young, unemployed people to “purchase” jobs from older workers. Can social security, by encouraging retirement and hence creating job vacancies for the young, improve the allocation of workers to jobs? Maybe, according to a standard model of labor market search, but public retirement programs currently pay the elderly substantially more than their jobs are worth. An important effect is that retirement reduces the value of other vacant jobs. Our results imply that recent reforms aimed at reducing retirement incentives are likely to improve labor market efficiency.

Sources of growth and the spectral properties of the labor market search model

This paper studies the dynamic properties of the labor market search model using three alternative sources of growth. Deterministic and stochastic exogenous growth specifications are compared with an endogenous growth specification, which is based on an external learning-by-doing mechanism. We apply Watson's (J. Political Economy 101 (6) (1993) 1011) test to assess the models’ performances over different frequency ranges. It is shown that the endogenous growth specification can bring the labor market search model into closer conformity with the data than its exogenous counterparts.