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Rule of reason

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The rule of reason is a legal doctrine used to interpret the Sherman Antitrust Act, one of the cornerstones of United States antitrust law. While some actions like price-fixing are considered illegal per se, other actions, such as possession of a monopoly, must be analyzed under the rule of reason and are only considered illegal when their effect is to unreasonably restrain trade. William Howard Taft, then Chief Judge of the Sixth Circuit Court of Appeals, first developed the doctrine in a ruling on Addyston Pipe and Steel Co. v. United States, which was affirmed in 1899 by the Supreme Court. The doctrine also played a major role in the 1911 Supreme Court case Standard Oil Company of New Jersey v. United States.

Upon its development some critics of Standard Oil, including the lone dissenter Justice John Marshall Harlan, argued that Standard Oil and its rule of reason were a departure from previous Sherman Act case law, which purportedly had interpreted the language of the Sherman Act to hold that all contracts restraining trade were prohibited, regardless of whether the restraint actually produced ill effects. These critics emphasized in particular the Court's decision in United States v. Trans-Missouri Freight Association, 166 U.S. 290 (1897), which contains some language suggesting that a mere restriction on the autonomy of traders would suffice to establish that an agreement restrained trade within the meaning of the Act.


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