NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Publications by Hugo Hopenhayn

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Working Papers and Chapters

January 2012Rewarding Duopoly Innovators: The Price of Exclusivity
with Matthew Mitchell
in Standards, Patents and Innovations, Timothy Simcoe, Ajay K. Agrawal, and Stuart Graham, organizers
August 2004Labor Market Policies and Employment Duration. The Effects of Labor Market Reform in Argentina
in Law and Employment: Lessons from Latin America and the Caribbean, James J. Heckman and Carmen Pag├ęs, editors
August 2002Market Size Matters
with Jeffrey R. Campbell: w9113
This paper characterizes the effects of market size on the size distribution of establishments for thirteen retail trade industries across 225 U.S. cities. In nearly every industry we examine, establishments are larger in larger cities, and in four industries the dispersion of establishment sizes depends on market size. Models of competition in which individual producers' markups do not depend on the number of producers are inconsistent with these observations. Models in which competition is tougher in larger markets can reproduce the positive effect of market size on establishments' average size.
April 1999Innovation Fertility and Patent Design
with Matthew F. Mitchell: w7070
It may be advantageous to provide a variety of kinds of patent protection to heterogenous innovations. Innovations which benefit society largely through their use as building blocks to future inventions may require a different scope of protection in order to be encouraged. We model the problem of designing an optimal patent menu (scope and length) when the fertility of an innovation in generating more innovations cannot be observed. The menu of patent scope can be implemented with mandated buyout fees. Evidence of heterogeneous fertility and patent obsolescence, keys to the model, are presented using patent data from the US.

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