Justice STEVENS delivered the opinion of the Court.
"Every contract, combination in the form of a trust or otherwise, or, conspiracy, in restraint of trade" is made illegal by § 1 of the Sherman Act, ch. 647, 26 Stat. 209, as amended, 15 U.S.C. § 1. The question whether an arrangement is a contract, combination, or conspiracy is different from and antecedent to the question whether it unreasonably restrains trade. This case raises that antecedent question...
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