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Market Definition and Market Power in Competition Analysis - Some Practical Issues

  • Patrick Massey

    (Competition Authority)

Registered author(s):

    Market definition plays a key role in competition analysis and has often proved controversial. However, it is merely a means to an end, the real issue being to establish whether or not firms have significant market power, i.e. the power to increase prices. This objective is rather different to the traditional neo-classical economic view of a market. The introduction of the SSNIP test in the US Department of Justice 1982 Merger Guidelines resulted in the development of new methods for defining markets and for measuring market power directly, thus eliminating the need to define the market at all.

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    File URL: http://www.esr.ie/vol31_4/2Massey.pdf
    File Function: First version, 2000
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    Article provided by Economic and Social Studies in its journal Economic and Social Review.

    Volume (Year): 31 (2000)
    Issue (Month): 4 ()
    Pages: 309-328

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    Handle: RePEc:eso:journl:v:31:y:2000:i:4:p:309-328
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    1. Stigler, George J & Sherwin, Robert A, 1985. "The Extent of the Market," Journal of Law and Economics, University of Chicago Press, vol. 28(3), pages 555-85, October.
    2. Sims, Christopher A, 1972. "Money, Income, and Causality," American Economic Review, American Economic Association, vol. 62(4), pages 540-52, September.
    3. Scheffman, David T & Spiller, Pablo T, 1987. "Geographic Market Definition under the U.S. Department of Justice Merger Guidelines," Journal of Law and Economics, University of Chicago Press, vol. 30(1), pages 123-47, April.
    4. Kahai, Simran K & Kaserman, David L & Mayo, John W, 1996. "Is the "Dominant Firm" Dominant? An Empirical Analysis of AT&T's Market Power," Journal of Law and Economics, University of Chicago Press, vol. 39(2), pages 499-517, October.
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