Every legal system must decide how to distinguish between agreements that are enforceable and those that are not. Formal bargains in the marketplace and casual promises in a social setting mark the two extremes, but many hard cases lie between. When gaps are left in a contract, how should courts fill them? What does it mean to say that an agreement is legally enforceable? If someone breaks a legally enforceable contract, what consequences follow?For 150 years, legal scholars have debated whether a set of coherent principles provide answers to such basic questions. Oliver Wendell Holmes put forward the affirmative case, arguing that bargained-for consideration, expectation damages, and a handful of related ideas captured the essence of contract law. The work of the next several generations, culminating in Grant Gilmore s "The Death of Contract" in 1974, took a contrary view. The coherence Holmes had tried to bring to the field was illusory. It was more sensible to see contracts as merely a species of civil obligation and resist the temptation to impose rigid and artificial rules.In "Reconstructing Contracts, " Douglas Baird takes stock of the current state of contract doctrine and in the process reinvigorates the classic framework of Anglo-American contract law. He shows that Holmes s principles are fundamentally sound. Even if they lack that talismanic quality formerly ascribed to them, properly understood they continue to provide the best guide to contracts for a new generation of students, practitioners, and judges."