University of Pennsylvania Carey Law School Penn Law: Legal Scholarship Repository Faculty Scholarship at Penn Law 2018 The Rule of Reason Herbert J. Hovenkamp University of Pennsylvania Carey Law School Follow this and additional works at: https://scholarship.law.upenn.edu/faculty_scholarship Part of the Antitrust and Trade Regulation Commons, Business Law, Public Responsibility, and Ethics Commons, Courts Commons, Economic History Commons, Industrial Organization Commons, Intellectual Property Law Commons, Law and Economics Commons, Law and Society Commons, Legal History Commons, Legal Remedies Commons, Litigation Commons, Public Economics Commons, and the Social Welfare Law Commons Repository Citation Hovenkamp, Herbert J., "The Rule of Reason" (2018). Faculty Scholarship at Penn Law. 1778. https://scholarship.law.upenn.edu/faculty_scholarship/1778 This Article is brought to you for free and open access by Penn Law: Legal Scholarship Repository. It has been accepted for inclusion in Faculty Scholarship at Penn Law by an authorized administrator of Penn Law: Legal Scholarship Repository. For more information, please contact
[email protected]. THE RULE OF REASON Herbert Hovenkamp* Abstract Antitrust’s rule of reason was born out of a thirty-year Supreme Court debate concerning the legality of multi-firm restraints on competition. By the late 1920s the basic contours of the rule for restraints among competitors was roughly established. Antitrust policy toward vertical restraints remained much more unstable, however, largely because their effects were so poorly understood. This Article provides a litigation field guide for antitrust claims under the rule of reason—or more precisely, for situations when application of the rule of reason is likely.