This paper studies the optimal wage structure of a firm with imperfect monitoring of worker effort. We find that when firms can commit to (implicit) long-term contracts, imperfect monitoring leads to optimal wage profiles that reflect worker seniority. We provide a precise measure of seniority...

We show that in labor market models with adverse selection, otherwise observationally equivalent workers will experience less wage growth following a period in which they change jobs than following a period in which they do not. We find little or no evidence to support this prediction. In most...

We develop a theory of career paths and earnings in an economy in which agents organize in production hierarchies. Agents climb these organizational hierarchies as they learn stochastically from other individuals. Earnings grow over time as agents acquire knowledge and occupy positions with...

Entrepreneurship requires energy and creativity as well as business acumen. Some factors that contribute to entrepreneurship may decline with age, but business skills increase with experience in high level positions. Having too many older workers in society slows entrepreneurship. Older workers...

This study investigates the professional soccer industry to ask whether the talent of an individual's co-workers helps explain differences in the rate of human capital accumulation on the job. Data tracking national soccer team performance and the professional leagues their members play for are...

We examine whether the benefits of high school work experience have changed over the last 20 years by comparing effects for the 1979 and 1997 cohorts of the National Longitudinal Survey of Youth. Our main specifications suggest that the future wage benefits of working 20 hours per week in the...

Exporters differ considerably in terms of export-market participation over time and employment size. But this marked diversity among exporters is not reflected in their workforce composition regarding commonly observed worker skills or occupations. Using Brazilian linked employer-employee data,...

Hiring inexperienced workers generates information about their abilities. If this information is public, workers obtain its benefits. If workers cannot compensate firms for hiring them, firms will hire too few inexperienced workers. I determine the effects of hiring workers and revealing more...

Our understanding of the determinants of physician skill and the extent to which skill is valued in the marketplace is superficial. Using a large, detailed panel of new obstetricians, we find that, even though physicians' maternal complication rates improve steadily with years of practice,...

We use international household-survey data to document that experience-wage profiles are flatter in poorer countries than in richer countries. We find a quantitatively similar pattern when we estimate returns to foreign experience by country of origin among U.S. immigrants. The most likely...