on their frequent collapse. When norms lead people to silence themselves, even an unpopular status quo can persist. Then one day, someone challenges the norm--a child who exclaims that the emperor has no clothes; a woman who says "me too." Sometimes suppressed outrage is unleashed, and long-standing practices fall. Sometimes change is more gradual, as "nudges" help produce new and different decisions--apps that count calories; texted reminders of deadlines; automatic enrollment in green energy or pension plans. Sunstein explores what kinds of nudges are effective and shows why nudges sometimes give way to bans and mandates. Finally, he considers social divisions, social cascades, and "partyism," when identification with a political party creates a strong bias against all members of an opposing party--which can both fuel and block social change.