"Information Disclosure in the Renewal of Patents" (with Claude Crampes), Les Annales d'Economie et Statistique, 49-50, pp 265-288, 1998. Reprinted in The Economics and Econometrics of Innovation, ed. Encaoua, Hall, Laisney, Mairesse, Kluwer academic publishers, 2000.

A patent is not a perfect protection against imitation. It only grants the patentholder the right to sue intruders once they have been identified. In order to identify an infringer, a patentholder must first monitor the market, and then react in case of infringement. His reaction may be to go to...

Intellectual property rights are legal constraints that limit entry in industries where incumbents are innovators. The set of legal constraints is the same for all industries, without considering that the externalities created by entry are not necessarily negative for the incumbent or that the...