This paper analyses mergers between gas and electricity activities, a "conglomerate relationship" in the Commission lingo. We first review the paradigmatic case of the recent failed takeover on Endesa by Gas Natural in Spain. Then, we detail a model of imperfect competition combining four...

In this paper we describe the Spanish electricity industry and its current regulatory regime. Special emphasis is given to the description and discussion of market design issues (including stranded cost recovery), the evolution of market structure, investment in generation capacity and network...

Network activities typically involve collecting a good or service (such as electric utilities, phone services, and rail transportation) from many producers or distributing them to many users. Producers and users are often widely scattered, geographically. Close financial integration of networks...

This paper presents a patent choice model allowing strategic decisions in a sequential game with two agents: a patentholder, who knows the characteristics of the market, and a potential entrant who has imperfect information about the value of demand. We study several Perfect Bayesian Equilibria....

"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.

This paper presents a model of media competition with free entry when media operators are financed both from advertisers and customers. The relation between advertising receipts and sales receipts, which are both complementary and antagonist, is different if media operators impose a price or a...