This paper examines the role of agent heterogeneity and learning on wage and employment dynamics. In the first half of the paper, I present an equilibrium matching model where heterogeneous workers and firms learn about match quality and bargain over wages. The model generalizes Jovanovic (1979) to the case of heterogeneous workers and firms. Equilibrium wage dispersion arises due to productivity differences across workers, technological differences across firms, and heterogeneity in beliefs about match quality. Under a simple CRS technology, the equilibrium wage is additively separable in worker- and firm-specific components, and in the posterior mean of beliefs about match quality. This parallels the "person and firm effects" empirical specification of Abowd et. al. (1999, AKM) and others. It consequently provides a theoretical context for the AKM model, and a formal economic interpretation of their empirical person and firm effects. The model also yields an assortative matching result that predicts a negative correlation between estimated person and firm effects, which is consistent with most empirical evidence. Finally, the model makes novel predictions about the relationship between the person and firm effects and separation behavior, job duration, and firm size. In the second half of the paper, I test the model's empirical predictions. I estimate fixed and mixed effects specifications of the equilibrium wage function on a novel linked employer-employee data set from the US Census Bureau. The mixed effect specifications generalize the earlier work of AKM and others. The learning component of the matching model implies a specific structure for the error covariance. I exploit this structure to test whether earnings residuals are consistent with Bayesian learning, and to estimate structural parameters of the matching model. I find considerable support for the matching model and its predictions in these data.

This dissertation contains several lines of research in macroeconomics and labor economics conducted during the course of my phd. The unifying theme of this research is the study of labor markets that are subject to macro-search frictions and are populated by heterogeneous workers. Combining these features is important for our understanding of the functioning of labor markets, both from a positive and normative standpoint. The first chapter of this dissertation is resolutely on the positive side. It analyzes how the combination of labor market frictions and worker heterogeneity in skills can shed light on the observed fluctuations in entries into and exits out of the labor force. The second chapter is also on the positive ground, but it brings labor market policies to the fore of the analysis. Along with heterogeneity in human capital over the lifecycle, it shows how some policy tools have contributed to the divergent employment experiences of older workers in Europe and in the United States since the 1980s. The third chapter more naturally lends itself to policy implications. It provides a quantitative study of the employment and welfare effects of statutory severance payments in an economy with wealth heterogeneity reflecting the absence of perfect insurance markets faced by risk-averse workers.

'Linking Education Policy to Labor Market Outcomes' examines current research and new evidence from Ghana and Pakistan representative of two of the poorest regions of the world to assess how education can increase income and help people move out of poverty. This study indicates that in addition to early investments in cognitive and noncognitive skills which produce a high return and lower the cost of later educational investment by making learning at later ages more efficient quality, efficiency, and linkages to the broader macro-economic context also matter. Education and relevant skills are still the key determinants of good labor market outcomes for individuals. However, education policies aimed at improving skills will have a limited effect on the incomes of that skilled workforce or on the performance of a national economy if other policies that increase the demand for these skills are not in place. For education to contribute to national economic growth, policies should aim at improving the quality of education by spending efficiently and by adapting the basic and postbasic curricula to develop the skills increasingly demanded on the global labor market, including critical thinking, problem solving, social behavior, and information technology.

The papers in this volume present an excellent sampling of the best of current research in labor economics, combining the most sophisticated theory and econometric methods with high-quality data on a variety of problems. Originally presented at a Universities-National Bureau Committee for Economic Research conference on labor markets in 1978, and not published elsewhere, the thirteen papers treat four interrelated themes: labor mobility, job turnover, and life-cycle dynamics; the analysis of unemployment compensation and employment policy; labor market discrimination; and labor market information and investment. The Introduction by Sherwin Rosen provides a thoughtful guide to the contents of the papers and offers suggestions for continuing research.