In 1839, the French government purchased the patent on the Daguerreotype process and" placed it in the public domain. This paper examines a mechanism under which governments" would use an auction to estimate the private value of patents and then offer to buy out patents at" this private value,...

This paper argues that worker cooperatives are prone to redistribution among members, and that this redistribution distorts incentives. I assume that employment contracts are incomplete. In the model cooperative members pay in a capital contribution to purchase equipment. They then receive...

Social commentators from William Julius Wilson to Charles Murray have argued that increased sorting of people into internally homogeneous" neighborhoods,schools, and marriages is spurring long-run inequality. Cali- bration of a formal model suggests that these fears are misplaced. In order to...

Increased HIV risk creates incentives for people with low sexual activity to reduce their activity, but may make high-activity people fatalistic, leading them to reduce their activity only slightly, or actually increase it. If high-activity people reduce their activity by a smaller proportion...

Under asymmetric information about sexual history, sexual activity creates externalities. Abstinence by those with few partners perversely increases the average probability of HIV infection in the pool of available partners. Since this increases prevalence among the high activity people who...

Why are millions dying of neglected diseases without vaccines, and is there a way to cheaply change that? Owen Barder, Michael Kremer and Heidi Williams advocate a proposal--Advance Market Commitments--that the G8 finance ministers plan to pilot in 2006.