This paper considers a model of two interconnected networks with different qualities. There are call externalities in the sense that consumers value calls they send and receive. Networks compete in two part tariffs. We show that call externalities create private incentives for each competitor to...

Cet article s’intéresse au rôle stratégique de l’activité de stockage du gaz et de sa régulation lorsqu’il existe un marché spot de la ressource. Dans la lignée de la littérature sur ce thème, nous envisageons l’activité de stockage comme un instrument de flexibilité pour les...

According to empirical evidence, technological spillovers are spatially bounded. This is one of the main reasons why firms are induced to locate in close prox-imity despite tough competition. This paper is an attempt to endogenize such spillovers. For that purpose, we try to explain why spatial...

Dans le cadre de ce papier le modèle présenté permet de discuter certains aspects de l’Accès des Tiers au Stockage (ATS) dans le secteur gazier. Dans la lignée de la littérature sur les achats stratégiques dans les relations verticales, nous intégrons une activité intermédiaire de...

Our work concerns the Internet network. We propose to modify the traditional analysis of the theoretical economic literature which emphasizes on the vertical integration among backbones and ISPs, and his difficulties because IBPs have a strongmarket power. We propose to build a sequential game...

This paper studies competition between Managed Care Organizations (MCOs) and “Conventional Insurers”. Most of the time, MCOs sign exclusive contracts with providers and these vertical restrictions associated to differentiation in the providers'market imply a risk segmentation. Taking into...