Optimal Patent Length and Breadth
探讨专利长度与宽度之间的权衡，给出最优专利政策可能涉及无限期专利的条件，通过调整专利宽度来提供创新激励。
In providing rewards to innovators, there is a tradeoff between patent length and breadth. This article provides conditions under which the optimal patent policy involves infinitely-lived patents, with patent breadth adjusting to provide the required reward for innovation.