Situated at the intersection of the three other branches of private law - property, torts, and contracts - the law of restitution and unjust enrichment raises fundamental questions about the ways in which the private law system is best understood. This area thus provides an opportunity to bring together the principles and policies underlying private law in general. Yet despite its practical importance, legal scholars have neglected the law of restitution in recent years. This course will explore the underlying theories and policies of private law through revitalizing and critically examining the law of restitution. We will explore various theoretical perspectives that might account for the way a range of private law cases are resolved. In general, the structure of unjust enrichment problems involves someone benefits at the expense of another. Specific manifestations of this problem that we will explore include benefits acquired through infringement of patents, copyrights, trademarks, and trade secrets; trespass, conversion, interference with contractual relations, and defamation; conferral of unsolicited benefits in cases of class actions, joint liability, or mistaken payments; profitable breach of contract and claims for benefits conferred in performing a losing contract; and triangular cases such as bona fide purchase and restitution from insolvent defendants.