From 1973 to 1991, the enforcement of anti-trust law was based on efficiency explanations as the Chicago School became dominant, and through legal writings such as Judge Robert Bork's book The Antitrust Paradox.
從1973年至1991年間，反托拉斯法的施行在芝加哥學派變成主流後，以效率解釋為其基礎，以及透過法官羅伯特·博克所著《反托拉斯悖論》（The Antitrust Paradox）等法律著作。