Drug prices are uniquely susceptible to radical price reductions through generic competition. Patented pharmaceuticals may be priced at more than 30 times the marginal cost of production; the excess is the patent rent collected by the drug company while the patent and exclusive marketing periods remain. Patent rents are significant. AIDS drugs which sell for US$10,000 per person per year in the US are sold generically for less than US$200. If patented drugs could be sold at the marginal cost of production, cost effective treatments would become even more attractive, and other interventions would become affordable. This Article proposes marginal cost (generic) pricing for most essential medicines used in the developing world. Global collecti...