Book excerpt: William Letwin's thorough, carefully argued, and elegantly written work is the only book length study of the Sherman Antitrust Act, a law designed to shape the economic life of a large complex society through maintaining the "correct" level of competition in the economy. This is a superb history and complete analysis of the Act, from its English and American common law antecedents to the events that led to the first revisions of the Act in the form of the Clayton Antitrust and Federal Trade Commission Acts.