Law & economics traces its intellectual roots to the University of Chicago. That lineage still shapes how the field is understood. Chicago price theory—especially Gary Becker’s (1976) systematic application of maximization, equilibrium, and stable preferences across social life, and George Stigler’s (1992, p. 459) suggestion that “every durable social institution or practice is efficient, or it would not persist over time”—left a deep imprint. It also left a durable misunderstanding.