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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.'' == History == 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. Others, including William Howard Taft and Robert Bork, argued that the decision and the principle it announced was entirely consistent with earlier case law. These scholars argue that much language in ''Trans-Missouri Freight'' was dicta, and also emphasized the Court's decision in ''United States v. Joint Traffic Association'', 171 U.S. 505 (1898), in which the Court announced that "ordinary contracts and combinations" did not offend the Sherman Act, because they restrained only trade "indirectly." Indeed, in his 1912 book on antitrust law, Taft reported that no critic of ''Standard Oil'' could succeed in Taft's challenge: to articulate one scenario in which the rule of reason would produce a result different from that produced under prior case law. Just seven years later, the Court unanimously reaffirmed the rule of reason in an opinion by Justice Louis Brandeis, ''Chicago Board of Trade v. United States'', 246 U.S. 231 (1918). The decision found that an agreement between rivals limiting rivalry on price after an exchange was closed was reasonable and thus did not violate the Sherman Act. On the same day, the Supreme Court also announced ''United States v. American Tobacco Co.'', 221 U.S. 106 (1911). That decision held that Section 2 of the Sherman Act, which bans monopolization, did not ban the mere possession of a monopoly but banned only the unreasonable acquisition or maintenance of monopoly. The rule was narrowed in later cases that held that certain kinds of restraints, such as price fixing agreements, group boycotts, and geographical market divisions, were illegal per se. These decisions followed up on the suggestion in ''Standard Oil'' that courts can determine that certain restraints are unreasonable based simply upon the "nature and character" of the agreement. More recently, the Supreme Court has removed a number of restraints from the category deemed unlawful ''per se'' and subjected them instead fact-based rule of reason analysis. These include non-price vertical restraints in 1977's ''Continental Television v. GTE Sylvania'', maximum resale price maintenance agreements in 1997's ''State Oil v. Khan'', and minimum resale price maintenance agreements in 2007's ''Leegin Creative Leather Products, Inc. v. PSKS, Inc.''. Moreover, the Supreme Court has reaffirmed the conclusion in ''Standard Oil'' that analysis under the rule of reason should focus on the economic but not the social consequences of a restraint (''National Society of Professional Engineers v. United States'', 435 U.S. 679 (1978)). Further, the Court retained the ''per se'' rule against tying contracts but raised the threshold showing of market power that plaintiffs must make to satisfy the rule's requirement of "economic power" (see ''Jefferson Parish Hospital District No. 2 v. Hyde'', 466 U.S. 2 (1985). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rule of reason」の詳細全文を読む スポンサード リンク
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