Vehicle emissions are falling. As the oldest vehicles in the fleet are scrapped and are replaced by cleaner vehicles, aggregate emissions decline. Given this trend, must costly used car regulation continue? The Clean Air Act of 1990 requires more stringent used car testing without considering...

This papers uses new micro data on vehicle pollution and merges on Census information owner income to study the relationship between air pollution and individual income. It is important to quantify how this externality varies with individual income when considering the equity and efficiency of...

Diabetics must choose how much effort to devote to health care. Technological innovation and product differentiation have lowered the price of diabetic compliance. New diabetic cohorts should be healthier than previous cohorts. This paper uses the 1976 and 1989 cross-sections of the National...