This paper offers an economic rationale for compulsory licensing of needed medicines in developing countries. The patent system is based on a trade-off between the “deadweight losses” caused by market power and the incentive to innovate created by increased profits from monopoly pricing during the period of the patent. However, markets for essential medicines under patent in developing countries with high income inequality are characterized by highly convex demand curves, producing large deadweight losses relative to potential profits when monopoly firms (...) exercise profit-maximizing pricing strategies. As a result, these markets are systematically ill-suited to exclusive marketing rights, a problem which can be corrected through compulsory licensing. Open licenses that permit any qualified firm to supply the market on the same terms, such as may be available under licenses of right or essential facility legal standards, can be used to mitigate the negative effects of government-granted patents, thereby increasing overall social welfare. (shrink)

Not all intellectual property rights grant the right to exclude that is indicative of “property rules,” as that term was used by Guido Calabresi and A. Douglas Melamed in their seminal article. Some intellectual property rights are “liability rules,” in which the right holder has an entitlement to compensation for use of the protected invention, not a right to preclude the use. Although patent laws normally grant a right to exclude others from use of the protected invention as a default, (...) most countries’ laws allow the government to convert the patent property rule into a liability rule through a compulsory license. It has been noted, for example, that by the end of the 1950s, the U.S. had issued compulsory licenses covering 40 to 50 thousand patents, including substantial portions of the patent portfolios of AT&T, General Electric, IBM, and Xerox. The U.S. Supreme Court recently expressed a willingness to accept liability rules over injunctions in some patent infringement cases. (shrink)