The Dissenter

#1210 Cristina Bicchieri: What Are Social Norms, and How do They Change?

Feb 2, 2026
Guest
Cristina Bicchieri
Cristina Bicchieri, a University of Pennsylvania scholar of social norms and decision making, breaks down how expectations shape cooperation and behavior. She explains what makes norms stick or change. Conversation covers measuring norms, child marriage studies, group identity, the power of normative language, and norm-nudging strategies for social and climate action.
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INSIGHT

Norms Keep Social Life Predictable

  • Social norms act as coordinating devices that create stable expectations and make social life possible.
  • Without norms, coordination collapses and social interaction becomes chaotic and anxious for outsiders.
INSIGHT

What Makes A Norm Strong

  • Norm strength is a status-quo property built from consistency, accuracy, and specificity of expectations.
  • Strong norms have collective agreement about a restricted set of acceptable behaviors.
INSIGHT

Stability Depends On Learning Modes

  • Norm stability is dynamic and depends on the population's learning modes and norm sensitivity.
  • Different learning models (Bayesian, limited memory, confirmation bias) change thresholds needed for minority ideas to spread.
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