We develop an explanation of the emergence of local norms, and theassociated phenomenon of geographical variation in behavior.Individuals are assumed to interact locally with neighbors in anenvironment with a network externality. Although many patterns ofbehavior are possible, the dispersed...

Recent years have seen the growing popularity of drugs designed to treat attention deficit hyperactivity disorder (ADHD), and the number of patients, scripts, and revenues has been steadily increasing. By the mid-1990s there were already several branded drugs marketed for this disorder, as well...

This paper explores aspects of the determination of airline faresin selected medium-sized U.S. markets subject to competition fromalternative airport hubs within driving distance. Passengers inthese markets often face substantial discounts at distantairports, in exchange for the time costs of...