Cite as: 525 U. S. 128 (1998)
Opinion of the Court
of law, a defense based upon a claim that only one small firm, not competition itself, had suffered injury.
The case before us involves Klor's. The Second Circuit did not forbid the defendants to introduce evidence of "justification." To the contrary, it invited the defendants to do so, for it said that the "per se rule" would apply only if no "pro-competitive justification" were to be found. 93 F. 3d, at 1061; cf. 7 P. Areeda & H. Hovenkamp, Antitrust Law
¶ 1510, p. 416 (1986) ("Boycotts are said to be unlawful per se but justifications are routinely considered in defining the forbidden category"). Thus, the specific legal question before us is whether an antitrust court considering an agreement by a buyer to purchase goods or services from one supplier rather than another should (after examining the buyer's reasons or justifications) apply the per se rule if it finds no legitimate business reason for that purchasing decision. We conclude no boycott-related per se rule applies and that the plaintiff here must allege and prove harm, not just to a single competitor, but to the competitive process, i. e., to competition itself.
Our conclusion rests in large part upon precedent, for precedent limits the per se rule in the boycott context to cases involving horizontal agreements among direct competitors. The agreement in Fashion Originators' Guild involved what may be called a group boycott in the strongest sense: A group of competitors threatened to withhold business from third parties unless those third parties would help them injure their directly competing rivals. Although Klor's involved a threat made by a single powerful firm, it also involved a horizontal agreement among those threatened, namely, the appliance suppliers, to hurt a competitor of the retailer who made the threat. See 359 U. S., at 208- 209; see also P. Areeda & L. Kaplow, Antitrust Analysis: Problems, Text, and Cases 333 (5th ed. 1997) (defining paradigmatic boycott as "collective action among a group of com-
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