Antitrust laws are traditionally used to attack monopolies like Facebook and Google which are able to either charge high prices or degrade the quality of their services because customers cannot switch to competitors. Antitrust laws are also used to attack cartels of businesses, which fix prices. But while antitrust law applies to anticompetitive behavior by employwers in labor markets as well, it has been rarely used in this way--despite substantial evidence that anticompetitive labor market practices have suppressed wages. In this book, Eric Posner describes how workers can use antitrust law to counter employer market power and obtain higher wages as a result.