The modern law of unjust enrichment is unique in many respects. In one sense, it is the newest and most significant development in the private law for a very long time. While it can claim ancient roots, as a discrete body of law unjust enrichment has only emerged from the long shadows of the law of contract in the last 20 years. The development and content of the law of unjust enrichment has, to a greater extent than perhaps anywhere else in the private law, been driven and shaped by academic rather than judicial influences. The law of unjust enrichment is also distinguished from the other principal heads of civil obligation in that its focus is on stripping the defendant of gains made rather than making good losses suffered by the plaintiff. Perhaps most controversially, the role or function of unjust enrichment may differ from the other principal parts of the private law in that the source of the entitlement protected is not found within the law of unjust enrichment, but in other areas of the law.