Cet article s'intéresse aux concentrations horizontales dans des marchés reliés verticalement. Dans un modèle de concurrence à la Cournot à deux niveaux, où les transactions se font par l'intermédiaire d'un marché, on montre que des fusions horizontales engendrant des effets de taille...

This paper studies horizontal mergers in vertically related markets. In atwo-level Cournot model, with an intermediate and a final market, we show thatdownstream mergers inducing size effects are, ceteris paribus, more profitablethan upstream ones. Moreover, a merger at one level reduces the...

This paper studies horizontal mergers in vertically related markets. In a two-level Cournot model, with an intermediate and a final market, we show that downstream mergers inducing size effects are, ceteris paribus, more profitable than upstream ones. Moreover, a merger at one level reduces the...

Le processus d'accession de l'Algérie à l'OMC, qui a débuté en 1987 dans le cadre du GATT, est de loin le plus long parmi les négociations en cours. Malgré ce délai, un certain nombre de problèmes importants doivent encore être réglés pour aboutir à un accord. Le passage du GATT à...

The determination of optimal fines to deter the formation or continuation of cartels is a major objective of competition policy. We provide an analysis of static and dynamic frameworks to characterize the restitution and deterrence properties of fines: cartel stability depends on their ability...

Cet article propose un bilan critique des diverses mesures qui ont été adoptées en France pour réguler le secteur du commerce, depuis la loi Royer de 1973 jusqu'à la récente loi relative aux nouvelles régulations économiques. Pour cela, nous distinguons d'une part le contrôle des...

We show that resale-below-cost laws enable producers to impose industry-wide price-floors to retailers. This mechanism suppresses downstream competition but also and more surprisingly dampens upstream competition, leading to higher prices and lower welfare. Price-floor may be more profitable for...

This paper analyzes the impact of a merger in the French retail sector on food prices, using a consumer panel data. We perform a di fference-in-diff erences analysis by comparing price changes in stores for which the local market structure is aff ected by the merger to unaff ected stores. In...

Competition agencies have the power to close an antitrust case in return for the commitment to end the alleged infringement. We examine how such a procedure affects deterrence and consumer welfare. We first show that it lowers the deterrent effect of competition policy. However, under asymmetric...