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Market Definition

Forthcoming in The Oxford Handbook of International Antitrust Economics (Roger D. Blair & D. Daniel Sokol, ed., 2013).

20 Pages Posted: 16 May 2013  

Louis Kaplow

Harvard Law School; National Bureau of Economic Research (NBER)

Date Written: May 15, 2013

Abstract

Market definition has long held a central place in competition law. This entry surveys recent analytical work that has called the market definition paradigm into question on a number of fronts: whether the process is feasible, whether market share threshold tests are coherent, whether the hypothetical monopolist test in merger guidelines is counterproductive, and whether and when the frequent focus on cross-elasticities is useful.

Keywords: Market definition, Market share thresholds, Mergers, Merger guidelines, Hypothetical monopolist test, Cross-elasticity, Competition policy, Antitrust

JEL Classification: D42, K21, L11, L40

Suggested Citation

Kaplow, Louis, Market Definition (May 15, 2013). Forthcoming in The Oxford Handbook of International Antitrust Economics (Roger D. Blair & D. Daniel Sokol, ed., 2013).. Available at SSRN: https://ssrn.com/abstract=2265304 or http://dx.doi.org/10.2139/ssrn.2265304

Louis Kaplow (Contact Author)

Harvard Law School ( email )

1575 Massachusetts Avenue
Cambridge, MA 02138
United States
617-495-4101 (Phone)
617-496-4880 (Fax)

HOME PAGE: http://www.law.harvard.edu/faculty/directory/facdir.php?id=32&show=bibliography

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

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