In some cases, the law permits a party that unilaterally provides a benefit to another party to recover the estimated value of this benefit. Despite calls for expanding the set of cases to which such a restitution rule applies, the law commonly applies a mutual consent rule under which a party...

Part I. Property rules and liability rules -- Property rules, liability rules and inalienability : one view of the cathedral / Guido Calabresi and A. Douglas Melamed -- Property rights and liability rules : the ex ante view of the cathedral / Lucian Arye Bebchuk -- Modular liability rules /...