If infectious people can infect other people, who in turn can infect others, and so on--the pure infection externality--government subsidies to affect private behavior should equally favor preventive and curative activities, if people recover to become susceptible again. Otherwise, other subsidy...

Despite interesting work on infectious diseases by such economists as Peter Francis, Michael Kremer, and Tomas Philipson, the literature does not set out the general structure of externalities involved in the prevention, and care of such diseases. The authors identify two kinds of externality....

The assumption of rational choice helps in understanding how people respond to infectious diseases. People maximize their well-being by choosing levels of prevention and therapy subject to the constraints they face. Objectives and constraints are numerous, necessitating tradeoffs. For example,...