This paper estimates social effects of incentivizing people in teams. In two field experiments featuring exogenous team formation and opportunities for repeated social interactions, we find large team effects that operate through social channels. The team compensation system induced agents to...

This paper estimates treatment size and status specific peer effects that are not detected by widely-used approaches to the estimation of spillovers. In a field experiment using university students, we find that subjects who have been incentivized to exercise increase gym usage more if they have...

Using multiple datasets from different time periods, we document declines in academic time investment by full-time college students in the United States between 1961 and 2003. Full-time students allocated 40 hours per week toward class and studying in 1961, whereas by 2003 they were investing...

Do smaller classes boost achievement mainly by helping teachers impart specific academic skills to students with low academic achievement? Or do they do so primarily by helping teachers engage poorly behaving students? The analysis uses the grade 3 to 4 transition in San Diego Unified School...

The rise of childhood obesity in less developed countries is often overlooked. We study the impact of body weight report cards in Mexico. The report cards increased parental knowledge and shifted parental attitudes about children's weight. We observe no meaningful changes in parental behaviors...

Financial incentives have been shown to have strong positive short‐run effects for problematic health behaviors, but the effects often disappear once incentive programs end. This paper analyzes the results of a large‐scale workplace field experiment to examine whether self‐funded...

This paper uses age-at-school-entry policies to identify the effect of female education on fertility and infant health. We focus on sharp contrasts in schooling, fertility, and infant health between women born just before and after the school entry date. School entry policies affect female...

There is a strong, positive and well-documented correlation between education and health outcomes. There is much less evidence on the extent to which this correlation reflects the causal effect of education on health - the parameter of interest for policy. In this paper we attempt to overcome...

Between 1973 and 2003, abortion providers in the United States were the targets of over 300 acts of extreme violence. Using unique data on attacks and on abortions, abortion providers, and births, we examine how anti-abortion violence has affected providers' decisions to perform abortions and...

We study the effects of receipts that include personalized ordering suggestions designed to reduce fat and calorie consumption on purchasing behavior at a restaurant chain. We find that customers, in the aggregate, made most of the item substitutions that were encouraged by the messages, such as...