The central philosophical puzzle about contract law involves the ground upon which contractual obligation arises. Omri Ben-Shahar\u27s intriguing essay, Contracts Without Consent: Exploring a New Basis for Contractual Liability, proposes a new theory of contractual liability and contains the seeds of an appealing new approach to this puzzle. In place of the traditional agreement-based conception of contractual liability under which, as Ben-Shahar says, a contract forms only when the positions of the two parties meet, Ben-Shahar proposes a new regime. His proposal imagines that offers and counteroffers generate a converging sequence of liability, under the principle that [a] party who manifests a willingness to enter into a contract at giv...