For Director and Levi, a dangerous implication of the drive for certainty and the reliance on numerous per se rules to help achieve greater certainty would result in the enfeeblement of the common law foundations of antitrust law, thereby precluding the antitrust laws from weathering future possible NRA attempts.

Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin, loc. 1138