This paper discusses the definition and identification of external treatment effects and experimental designs capable of detecting these effects. External effects occur when the outcome of a given individual is affected by the treatment assignments of other individuals. The paper argues that...

This paper investigates the degree to which the local prevalence of AIDS increases the demand for disease-preventing methods of contraception among young adults. Using data from the National Longitudinal Survey of Youth (NLSY), we find substantial evidence that the use of condoms was quite...

The future course of old-age mortality is of great importance to public sector expenditures in countries where old-age programs account for large fractions of the public budget. This paper argues that the competitive market prices of mortality contingent claims, such as annuities and life...

This paper analyzes the savings and health care impacts of mortality contingent claims, defined here as income measures, such as annuities and life-insurance, under which earned income is contingent on the length of one's life. The postwar increase in mandatory annuity and life-insurance...

A common view in public finance is that there is an efficiency-redistribution tradeoff in which distortions are tolerated in order to redistribute income. However, the fact that so much public- and private redistributive activity involves in-kind transfers rather than cash may be indicative of...

Traditional economic analysis has proposed well known remedies to deal with consumption externalities and inefficient technological change in isolation, but lacks a general framework for addressing them jointly. We argue that the joint determination of R&D and consumption externalities is...

This paper analyzes the factors contributing to the worldwide long-run rise in obesity and the effects of public interventions on its continued growth. The growth of obesity in a population results from an increase in calorie consumption relative to physical activity. Yet in developed countries,...