Frank Easterbrook's 1984 article, The Limits of Antitrust, did not focus on public antitrust enforcement. Nevertheless, it expressed the kind of antitrust thinking that led the Antitrust Division of the U.S. Department of Justice, around the same time, to shift its resources to cartel...

After the Supreme Court's 2007 decision in Bell Atlantic Corp. v. Twombly, an antitrust plaintiff who tries to plead an agreement in restraint of trade under Section 1 of the Sherman Act must allege more than parallel conduct and an undefined “conspiracy.” Now, the complaint must include...