This thesis is about attempts to provide a theoretical framework for the law of
Restitution, a subject in which there is growing academic and judicial interest.
Part I of the thesis considers the concept of "unjust enrichment", which is
currently gaining the status of orthodoxy as an explanation of Restitution. The
law of Restitution, perceived to be a third category, alongside contract and tort,
of the law of obligations, is said to consist of liability rules uniformly explicable
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