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Quotation from Standard Oil Co. of New Jersey v. United States by Supreme Court of the United States
“And, of course, when the second section is thus harmonized with and made as it was intended to be the complement of the first, it becomes obvious that the criteria to be resorted to in any given case for the purpose of ascertaining whether violations of the section have been committed is the rule of reason, guided by the established law and by the plain duty to enforce the prohibitions of the act, and thus the public policy which its restrictions were obviously enacted to subserve.”
Standard Oil Co. of New Jersey v. United States, Opinion of the Court (Chief Justice White) (excerpt) (U.S. Reports text (Wikisource))

White names the rule of reason as the test under the act's second section, on monopolization.
Citation: "And, of course, when the second section is thus harmonized with and made as it was intended to be the complement of the first, it becomes obvious that the criteria to be resorted to in any given case for the purpose of ascertaining whether violations of the section have been committed is the rule of reason, guided by the established law and by the plain duty to enforce the prohibitions of the act, and thus the public policy which its restrictions were obviously enacted to subserve." — Supreme Court of the United States, Standard Oil Co. of New Jersey v. United States, Opinion of the Court (Chief Justice White) (excerpt) (U.S. Reports text (Wikisource)). (id standard-oil-v-united-states-q2)
Portrait: Edward White, head-and-shoulders portrait, facing slightly left, 1905, Johnston, Frances Benjamin, 1864-1952, photographer., Public domain.
