Two-Sided Market Definition
David S. Evans
University of Chicago Law School; University College London; Global Economics Group
November 11, 2009
ABA Section of Antitrust Law, MARKET DEFINITION IN ANTITRUST: THEORY AND CASE STUDIES, Forthcoming
This paper addresses the analysis of market definition when the parties involved in an antitrust or merger analysis include one or more two-sided platforms. We discuss how standard market definition measures such as SSNIP tests, diversion ratios, and conditional logit demand analyses have to be modified to account for the unique characteristics of two-sided platforms. We also review how market definition of two- sided platforms was treated in recent US and EC case law.
Number of Pages in PDF File: 35
Keywords: multi-sided platforms, two-sided platforms, two-sided markets, market definition, antitrust analysis, merger analysis
JEL Classification: K21, L1, L4
Date posted: April 29, 2009 ; Last revised: November 13, 2009
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