Strategic and deterrent pricing responses to antitrust investigations

This paper examines the issue of the effects of antitrust on pricing through two empirical studies. The first analyzes time series of prices in five industries involved in antitrust cases to determine whether the various stages of the antitrust process influenced pricing behavior. Some evidence of a ‘deterrent’ effect is found, with real prices lower than their pre-investigation level following the conclusion of the case; a major part of the pricing reaction occurs prior to the filing of formal charges. The second study provides additional evidence of the existence of such a ‘strategic’ reaction to the onset of investigation through an examination of prices in 23 industries investigated but not charged with price fixing.