Over the past 25 years in the United States, enforcement of drug prohibition has expanded dramatically. Over the same period, however, the trends in drug production and consumption have been essentially flat, and the real, purityadjusted prices of both cocaine and heroin have more than halved....

This paper uses a set of "natural experiments," created by the passage of a U.S. Department of Transportation drug-testing mandate and 13 state testing laws, to examine the effects of testing truckers for illicit substances on highway safety. Since truckers do not bear the full costs of their...

We use a regression discontinuity design to analyze an understudied aspect of school accountability systems—how schools use financial rewards. For two years, California's accountability system financially rewarded schools based on a deterministic function of test scores. Qualifying schools...

Drawing on original fieldwork in the slums of Ndola in Northern Zambia we study the role of family structure in caring for vulnerable children. We try to isolate those features of a child’s nuclear and extended family that put him most at risk of ending up on the streets. We find that older,...

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...

Drawing on original fieldwork in the slums of Ndola in Northern Zambia we isolate those features of a child's nuclear and extended family that put him most at risk of ending up on the streets. We find that older, male children and particularly orphaned children are more likely to wind up on the...