The growing efficiency of information networks, now distinct from the physical networks of conventional retail markets, should, theoretically, lead to friction-free efficient markets, with less price dispersion. But empirical evidence point to another direction: more precise segmentation on the...

In this paper, we propose a model of competition between a private television channel, financed by advertising, and a public channel, financed by advertising and a transfer of public funds. In this framework, we study the impact of an advertising quota imposed on the public channel on the two...

This paper deals with the question of the security of the payments on Internet and proposes a formal framework to study its impact on the development of the electronic commerce. We show, within the framework of a competitive supply of the security of the payments, that a weak development of the...

Using a survey on cultural habits and consumption behavior of 2,000 individuals, we study the determinants of physical purchases and pay-downloads in four cultural industries: books, recorded music, movies, and video games. We show that the impact of piracy on legal purchases differs among these...