Section 2 Symposium: Bill Kolasky on a Stepwise Rule of Reason for Exclusionary Conduct

The most controversial part of the Justice Department’s Single Firm Conduct Report is the Department’s proposed use of what it terms a “substantial disproportionality” test for exclusionary conduct. Under this test, the Justice Department would bring a case only if the harm to consumers and competition caused by a dominant or near-dominant firm’s conduct is “substantially disproportionate” to any legitimate benefits the firm might realize. The Department argues that this test is superior to the three alternative tests it considers—an effects-balancing test, a no-economic-sense test, and an equally-efficient-competitor test—because it is more administrable and because it reduces the risk of false positives (i.e., finding conduct unlawful that does not harm competition ), which the Department views as more serious than that of false negatives (i.e., finding conduct lawful that does harm competition).

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