Defences In Unjust Enrichment

This book is the second in a series of essay collections on defences in private law. It addresses defences to liability arising in unjust enrichment. The essays are written from a range of perspectives and methodologies. Some are doctrinal, others are theoretical, and several offer comparative insights. The most important defence in this area of the law, change of position, is addressed in detail, but many other defences are treated too, as well as the interrelations between these defences within the law of unjust enrichment. The essays offer novel claims and ways of looking at problems in this challenging area of legal study.

This new edition of Unjust Enrichment by the editor of the Clarendon Law Series, is a fully updated, clear and concise account of the law of unjust enrichment. It attempts to move away from the use of obscure terminology inherited from the past. This text is the first book to insist on the switch from restitution to unjust enrichment, from response to event. It organises modern law around five simple questions: Was the defendant enriched? If so, was it at the claimant's expense? If so, was it unjust? The fourth question is then what kind of right the claimant has, and the fifth is whether the defendant has any defences. This second edition was revised and updated by Peter Birks before his death from cancer on 6 July 2004 at the age of 62. It represents the final thinking of the world's leading authority on the subject.

Unjustified enrichment has been one of the most intellectually vital areas of private law. There is, however, still no unanimity among civil-law and common-law legal systems about how to structure this important branch of the law of obligations. Several key issues are considered comparatively in this 2002 book, including grounds for recovery of enrichment, defences, third-party enrichment, as well as proprietary and taxonomic questions. Two contributors deal with each topic, one a representative of a common-law system, the other a representative of a civil-law or mixed system. This approach illuminates not just similarities or differences between systems, but also what different systems can learn from one another. In an area of law whose territory is still partially uncharted and whose borders are contested, such comparative perspectives will be valuable for both academic analysis of the law and its development by the courts.

The articles, based on a symposium held in 2003, deal with numerous theoretical and practical issues that surround restitution and unjust enrichment.

This comprehensive yet accessible Research Handbook offers an expert guide to the key concepts, principles and debates in the modern law of unjust enrichment and restitution.

The identity and existence of a loss-based defence in the law of unjust enrichment is disputed. Widely known as 'passing on', but better identified as 'disimpoverishment', this defence has generated confusion and disagreement across and within England, Australia, Canada and the United States of America. This book seeks to address these problems in three ways. First, by providing a solution to the defence's terminological problems and presenting a coherent picture of the current state of the law. Secondly, by examining whether a defendant's unjust enrichment can be said to have come 'at the expense of' a claimant when a third party has borne the cost of that enrichment. Put another way, whether awards of restitution are, or should be, restricted by the value of a claimant's loss. And finally, by analyzing the reasons in favour of accepting or rejecting a loss-based defence in the law of unjust enrichment. Numerous scholarly textbooks and law journals have devoted space to these issues. This work, however, has tended to focus narrowly on either particular cases or sets of issues. This book seeks to address this deficiency by collating, and providing total coverage of, the controversies and questions pertaining to a loss-based defence in the law of unjust enrichment. This work will be essential reading for anyone interested in the law of restitution, and in its relationship with other areas of private law.

Six public lectures given by Peter Birks when he was the Centennial Visiting Fellow at the Victoria University of Wellington Law School in August and September 1999.