 Third, and related, judges usually face severe constraints in the set of legal rules they may consider in any adjudication. When confronted by a tort case, for example, the court usually considers a limited number of legal regimes; perhaps it will reformulate the standard of care or shift from a regime of negligence to one of strict liability. A court, however, is unlikely to adopt a complex scheme of no-fault insurance or to impose a different insurance scheme, even though these more radical transformations of social institutions would provide higher overall welfare.