[eng] Price discrimination, product differentiation and international trade. . The aim of this article is to fill up four gaps encountered in the international product differentiation standard theory : production of only one variety per firm for a given good, determination of the intra-industry...

[eng] International trade theory in monopolistic competition. A comparative analysis of basic models. . The analysis of international trade theory with product differentiation and monopolistic competition is mainly founded on three different basic models (Lancaster, Krugman, Shaked-Sutton) which...

[fre] Marchés contestables, différenciation des produits et discrimination des prix. . L'objet de cet article est d'examiner les conditions d'équilibre de marchés par­faitement contestables à l'aide des modèles de concurrence spatiale. On définit une soutenabilité au sens faible...