Editing United States antitrust law (section)

===Tacit collusion and oligopoly===
{{Slist tacit collusion}}
{{main|Oligopoly|Tacit collusion}}
*''[[Matsushita Electric Industrial Co., Ltd. v. Zenith Radio Corp.]]'', 475 U.S. 574 (1986) held that the evidence needed to show unlawful collusion contrary to the Sherman Act must be enough to exclude the possibility of individual behavior.
*''[[Bell Atlantic Corp. v. Twombly]]'', 550 U.S. 544 (2007) 5 to 2, while Bell Atlantic and other major telephone companies were alleged to have acted in concert to share markets, and not compete in each other's territory to the detriment of small businesses, it was held that in absence of evidence of an agreement, parallel conduct is not enough to ground a case under the Sherman Act §1
*''[[Interstate Circuit, Inc. v. United States]]'', 306 U.S. 208 (1939)
*''[[Theatre Enterprises v. Paramount Distributing]]'', 346 U.S. 537 (1954), no evidence of illegal agreement, however film distributors gave first film releases to downtown Baltimore theatres, and suburban theatres were forced to wait longer. Held, there needed to be evidence of conspiracy to injure
*''[[United States v. American Tobacco Company]]'', 221 U.S. 106 (1911) found to have monopolized the trade.
*''[[American Tobacco Co. v. United States]]'', 328 U.S. 781 (1946) after American Tobacco Co was broken up, the four entities were found to have achieved a collectively dominant position, which still amounted to monopolization of the market contrary to the Sherman Act §2
*''[[American Column & Lumber Co. v. United States]]'', 257 US 377 (1921) information sharing
*''[[Maple Flooring Manufacturers' Assn. v. United States]]'', 268 U.S. 563 (1925)
*''[[United States v. Container Corp.]]'', 393 U.S. 333 (1969)
*[[Airline Tariff Publishing Company]], settlement with the [[US Department of Justice]]