Professions play a key role in determining the division of labor and the returns to skilled work. This paper studies the productivity difference between physicians and nurse practitioners (NPs), two health care professions performing overlapping tasks but with stark differences in background,...

This study investigates causal effects of changes in subjective probabilities of being pulled over and involved in accidents if driving while intoxicated on individuals’ drinking and driving choices. We also examine how hypothetical changes in perceptions of sanction severity affect drunk...

Many studies have estimated the cost of smoking. In recent years, such estimates have been widely used in litigation against the tobacco companies. Both longitudinal and cross-sectional methods have been used. On balance, the longitudinal approach, the one used in this study, is much preferable...

We used the first five waves of the Health and Retirement Study (HRS) to study three distinct but possibly interrelated phenomena: smoking cessation, changes in alcohol consumption, and changes in weight. The HRS is well suited for our study because it contains smoking and drinking behavior...