Durable Inequality is an important and insightful book. In this work, Charles Tilly links organizational needs to the production and reproduction of social inequality. For some time now, organizational theorists have demonstrated that formal organizations are central actors in modern society, and that the significant environment of formal organizations are other formal organizations. Durable Inequality demonstrates how social inequality is directly tied to solving organizational problems. His four master mechanisms—exploitation, opportunity hoarding, emulation, and adaptation—tell us a great deal about how inequality is produced and maintained. The argument about categorical pairing and how such pairing is used by organizations to generate inequality is plausible and seductive.