Harvard Law School; National Bureau of Economic Research (NBER)
May 15, 2013
Forthcoming in The Oxford Handbook of International Antitrust Economics (Roger D. Blair & D. Daniel Sokol, ed., 2013).
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.
Number of Pages in PDF File: 20
Keywords: Market definition, Market share thresholds, Mergers, Merger guidelines, Hypothetical monopolist test, Cross-elasticity, Competition policy, Antitrust
JEL Classification: D42, K21, L11, L40
Date posted: May 16, 2013
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