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Indices de concentration, pouvoir de monopole et variations conjecturales : quelques extensions

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  • Jean-Pascal Simonin

Abstract

[fre] L'objet de cet article est de préciser certains points des relations théoriques qui existent entre les indices de concentration et les mesures du pouvoir de mono­pole. Après avoir présenté une généralisation de l'indice d'Herfindahl, l'auteur propose des indices adaptés au cas de l'entreprise pilote. Il est enfin montré que le passage du pouvoir de monopole au taux de marge bénéficiaire au niveau de l'industrie peut présenter certaines difficultés lorsque la concentration est mesurée par le taux de concentration. [eng] Concentration indexes, monopole power and conjectural variations : some extensions. The purpose of this paper is to make clearer some aspects of the theoretical relationships that exist between the concentration indices and the measures of the monopoly power. First presenting a generalisation of Herfindahl index, the author then puts forward some indices which fit in with the cas of the leading firm. It is finally demonstrated that some difficulties may arise as we pass from the monopoly power to the ratio of profit to revenue at industry level, when the concentration is measured by the concentration ratio.

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  • Jean-Pascal Simonin, 1980. "Indices de concentration, pouvoir de monopole et variations conjecturales : quelques extensions," Revue Économique, Programme National Persée, vol. 31(1), pages 121-135.
    • Handle: RePEc:prs:reveco:reco_0035-2764_1980_num_31_1_408515
    DOI: 10.3406/reco.1980.408515
    Note: DOI:10.3406/reco.1980.408515
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    References listed on IDEAS

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    1. Iwata, Gyoichi, 1974. "Measurement of Conjectural Variations in Oligopoly," Econometrica, Econometric Society, vol. 42(5), pages 947-966, September.
    2. Saving, Thomas R, 1970. "Concentration Ratios and the Degree of Monopoly," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 11(1), pages 139-146, February.
    3. Marfels, Christian, 1971. "Absolute and Relative Measures of Concentration Reconsidered," Kyklos, Wiley Blackwell, vol. 24(4), pages 753-766.
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    5. Cowling, Keith & Waterson, Michael, 1976. "Price-Cost Margins and Market Structure," Economica, London School of Economics and Political Science, vol. 43(171), pages 267-274, August.
    6. David Encaoua & Alexis Jacquemin, 1978. "Indices de concentration et pouvoir de monopole," Revue Économique, Programme National Persée, vol. 29(3), pages 514-537.
    7. Cowling, Keith, 1976. "On the theoretical specification of industrial structure-performance relationships," European Economic Review, Elsevier, vol. 8(1), pages 1-14, June.
    8. John C. Hause, 1977. "The Measurement of Concentrated Industrial Structure and the Size Distribution of Firms," NBER Chapters, in: Annals of Economic and Social Measurement, Volume 6, number 1, pages 73-107, National Bureau of Economic Research, Inc.
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    1. David Encaoua & Bernard Franck, 1982. "Pouvoir de monopole et répartition salaires-profits," Revue Économique, Programme National Persée, vol. 33(1), pages 107-131.

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