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Is equating market share to market power a sound economic principle?

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  • Ciara Whelan

Abstract

There is a long history of mapping market structure into market power in economic analysis. This paper addresses the validity of this principle for both homogenous and differentiated products industries. While mapping market share dominance into market power may be acceptable for homogenous goods as a rule of thumb, it is by no means a robust result. In the case of differentiated products industries, there is no theoretical foundation for such a mapping. This paper highlights the need to move towards a structural approach to assessing market power in industries.

Suggested Citation

  • Ciara Whelan, 2003. "Is equating market share to market power a sound economic principle?," Open Access publications 10197/136, School of Economics, University College Dublin.
    • Handle: RePEc:ucn:oapubs:10197/136
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    File URL: http://hdl.handle.net/10197/136
    File Function: Open Access version, 2003
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    References listed on IDEAS

    as
    1. Walsh, Patrick Paul & Whelan, Ciara, 1999. "Modelling Price Dispersion as an Outcome of Competition in the Irish Grocery Market," Journal of Industrial Economics, Wiley Blackwell, vol. 47(3), pages 325-343, September.
    2. Buzzacchi, Luigi & Valletti, Tommaso M., 2006. "Firm size distribution: Testing the "independent submarkets model" in the Italian motor insurance industry," International Journal of Industrial Organization, Elsevier, vol. 24(4), pages 809-834, July.
    3. Patrick Paul Walsh & Ciara Whelan, 2002. "Portfolio Effects and Firm Size Distribution - Carbonated Soft Drinks," The Economic and Social Review, Economic and Social Studies, vol. 33(1), pages 43-54.
    4. Patrick Paul Walsh & Ciara Whelan, 2001. "Product Differentiation and Firm Size Distribution - An Application to Carbonated Soft Drinks," Working Papers 200113, School of Economics, University College Dublin.
    5. Joris Pinkse & Margaret E. Slade & Craig Brett, 2002. "Spatial Price Competition: A Semiparametric Approach," Econometrica, Econometric Society, vol. 70(3), pages 1111-1153, May.
    6. Patrick Paul Walsh & Ciara Whelan, 1999. "A Rationale for Repealing the 1987 Groceries Order," The Economic and Social Review, Economic and Social Studies, vol. 30(1), pages 71-90.
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    Cited by:

    1. Otero, Karina V., 2008. "Evolución del Poder de Mercado en los Servicios de Intermediación Financiera en Argentina," MPRA Paper 86794, University Library of Munich, Germany, revised Sep 2009.

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    More about this item

    Keywords

    Market shares; Homogenous and differentiated products industries; Market power; Market share; Industrial organization (Economic theory); Commercial products;
    All these keywords.

    JEL classification:

    • K2 - Law and Economics - - Regulation and Business Law
    • L11 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Production, Pricing, and Market Structure; Size Distribution of Firms
    • L25 - Industrial Organization - - Firm Objectives, Organization, and Behavior - - - Firm Performance
    • L40 - Industrial Organization - - Antitrust Issues and Policies - - - General
    • L81 - Industrial Organization - - Industry Studies: Services - - - Retail and Wholesale Trade; e-Commerce

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