October 6,2006 Donald S. Clark
RE: Comments Regarding Section 2 Hearings, Project No. P062106 - Two-Sided Platforms Dear Mr. Clark: I am pleased to submit my comments in the above-referenced proceeding on Single-Firm Conduct and Antitrust Law. I have enclosed my statement Two-Sided Platforms and Analysis of Single-Firm Conduct, together with two papers that I have previously (co-)written on this topic. My conclusion is that there is no general reason, at least at this point in the literature, to believe that two-sided platforms are more or less likely than other businesses to engage in anticompetitive practices. When two-sided platforms are the subject of antitrust analysis, proper analysis should consider the implications of two-sidedness for evaluating market definition, assessing market power, considering efficiencies, and assessing anticompetitive effects. Please confirm receipt and let me know if you have any questions about my statement. Thank you very much. Regards, David S. Evans The Industrial Organization of Markets with
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