Government regulations, whether they appear in statutes or administrative rules, often contain exemptions: certain persons or transactions are fully or partially excused from complying with the regulatory scheme. Even regulations without explicit exemptions may be worded in such a way as to implicitly exempt certain persons. A rule that applies to all green objects implicitly exempts objects of every other color? Economists and legal scholars have written dozens of analyses of the efficiency of various government regulations but, with a few exceptions, they have not paid much attention to exemptions from those regulatory requirements. The limited economic and legal literature on exemptions focuses on one particular type of exemption - the...