We report a puzzling pair of facts concerning the organization of science. The concentration of research output is declining at the department level but increasing at the individual level. For example, in evolutionary biology, over the period 1980 to 2000, the fraction of citation-weighted...

Past research on the health workforce can be structured into three perspectives - "health workforce planning" (1960 through 1970s); "the health worker as economic actor" (1980s through 1990s); and "the health worker as necessary resource" (1990s through 2000s). During the first phase, shortages...

We document the impact of the AIDS crisis on non-AIDS related health services in fourteen sub-Saharan African countries. Using multiple waves of Demographic and Health Surveys (DHS) for each country, we examine antenatal care, birth deliveries, and rates of immunization for children born between...

The effect of shift structure on worker performance and productivity is an issue of increasing interest to firms and regulatory bodies. Using approximately 742,000 emergency medical incidents attended by 2,400 paramedics in the state of Mississippi, we evaluate the extent to which paramedics'...

Despite recent international efforts to increase antiretroviral treatment (ART) coverage, it is estimated that more than 5 million people who need ART in developing countries do not receive such treatment. Shortages of human resources to treat HIV/AIDS (HRHA) are one of the main constraints to...

Market structure is determined by the entry and exit decisions of individual producers. These decisions are driven by expectations of future profits which, in turn, depend on the nature of competition within the market. In this paper we estimate a dynamic, structural model of entry and exit in...

New gastroenterologists participated in a labor market clearinghouse (a quot;matchquot;) from 1986 through the late 1990's, after which the match was abandoned. This provides an opportunity to study the effects of a match, by observing the differences in the outcomes and organization of the...

A recent antitrust lawsuit against the National Residency Matching Program renewed interest in understanding the effects of a centralized match on wages of medical residents. Bulow and Levin (forthcoming) propose a simple model of the NRMP, in which firms set impersonal salaries simultaneously,...

Occupational licensing laws have been relaxed in a large number of U.S. states to give nurse practitioners the ability to perform more tasks without the supervision of medical doctors. We investigate how these regulations may affect wages, employment, costs, and quality of providing certain...

Occupational licensing is intended to protect consumers. Whether it does so is an important, but unanswered, question. Exploiting variation across states and municipalities in the timing and details of midwifery laws introduced during the period 1900-1940, and using a rich data set that we...