This essay endeavors to comment on the main themes of Ernest J. Weinrib’s The Idea of Private Law. Weinrib’s primary example of private law, and the example I shall pursue here, is tort law. In a typical torts case, the plaintiff complains that he has been injured as the proximate result of the wrongdoing (usually the negligence) of the defendant. This, the plaintiff says, is a breach of legal duty for which the defendant is liable. Questions about the foundations of tort law are questions about the significance of the terms in this story and about why, when it is proven that a transaction characterizable in these terms has occurred, the plaintiff is entitled to what he asks for, namely, compensation.