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Marchés contestables, différenciation des produits et discrimination des prix

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  • Jean-Marc Siroën

Abstract

[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 (régime de prix donné) et une soutenabilité au sens fort. Les conclusions du modèle Baumol-Panzar-Willig sont remises en cause. La tarification au coût marginal de production ne suffit pas à garantir la soutenabilité au sens faible. Elle est inefficace socialement. La tarification au prix final unique minimal, efficace socialement, est soutenable au sens faible, mais seulement sous certaines conditions au sens fort. D'une manière générale, une configuration spatiale soutenable implique une discrimination tarifaire. Ces conclusions remettent en cause les fondements des politiques de déréglementation. [eng] Contestable markets, product differentiation and price discrimination.. . The article is concerned with a spatial competition framework in perfect contestable markets. Two types of sustainability are distinguished. A weak form (with an invariant price strategy) and a strong form. The Baumol-Panzar-Willig results are not valid in a spatial context. Marginal production cost pricing is not a sufficient condition for a weak sustainability. It is socially inefficient. Uniform delivered pricing is socially efficient and sustainable in a weak form. Additional conditions are necessary for a strong form. Gene-rally, a spatial sustainable configuration implies priee discrimination. The results are opposed to theorical fondations of deregulation policies.

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  • Jean-Marc Siroën, 1993. "Marchés contestables, différenciation des produits et discrimination des prix," Revue Économique, Programme National Persée, vol. 44(3), pages 569-592.
    • Handle: RePEc:prs:reveco:reco_0035-2764_1993_num_44_3_409464
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