Patent protection and threat of litigation in oligopoly

In a context of imperfect patent protection, this paper analyses the strategic use of patents from a novel perspective; patents are seen as a means available to the incumbent firm to control entry and, more importantly, to influence the post-entry market interaction process effectively, by creating the conditions that favour collusion. The level of patent protection chosen by the incumbent affects the likelihood that a potential entrant will be found guilty of patent infringement. This mechanism can operate as a punishment device that eases the conditions for collusion sustainability. Therefore, in a sense, patent protection can be regarded as an instrument allowing replication of the monopoly outcome in the context of a contestable market.