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On the existence of the competitive equilibrium in Grossman and Shapiro (1984)

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  • Creane, Anthony

Abstract

In their seminal paper, Grossman and Shapiro (1984) assume that it is not profitable for a firm to deviate to the supercompetitive price of Salop (1979). In this paper, it is shown that this assumption is violated if, roughly, each firm reaches less than half of all consumers unless it is a duopoly. This implies that most of the simulations in Grossman and Shapiro (1984) are not actually equilibria. More importantly, this implies that for their equilibrium to exist nearly all consumers must receive at least one ad. For example, with more than four firms in the market, at least 96% of the consumers must receive at least one ad, and the percentage increases with the number of firms.

Suggested Citation

  • Creane, Anthony, 2020. "On the existence of the competitive equilibrium in Grossman and Shapiro (1984)," MPRA Paper 102074, University Library of Munich, Germany.
    • Handle: RePEc:pra:mprapa:102074
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    File URL: https://mpra.ub.uni-muenchen.de/102074/1/MPRA_paper_102074.pdf
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    References listed on IDEAS

    as
    1. Jeffrey M. Perloff & Steven C. Salop, 1985. "Equilibrium with Product Differentiation," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 52(1), pages 107-120.
    2. Jean Tirole, 1988. "The Theory of Industrial Organization," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262200716, December.
    3. Creane, Anthony & Manduchi, Agostino, 2022. "Informative advertising in monopolistically competitive markets," International Journal of Industrial Organization, Elsevier, vol. 83(C).
    4. Gene M. Grossman & Carl Shapiro, 1984. "Informative Advertising with Differentiated Products," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 51(1), pages 63-81.
    5. Steven C. Salop, 1979. "Monopolistic Competition with Outside Goods," Bell Journal of Economics, The RAND Corporation, vol. 10(1), pages 141-156, Spring.
    6. Christou, C. & Vettas, N., 2008. "On informative advertising and product differentiation," International Journal of Industrial Organization, Elsevier, vol. 26(1), pages 92-112, January.
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    More about this item

    Keywords

    informative advertising; existence of equilibrium;

    JEL classification:

    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness
    • L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
    • L15 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Information and Product Quality

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