MarketingSales
Influence
Robert Cialdini
1984
Summary
Robert Cialdini spent years studying the science of compliance and persuasion, embedding himself with salespeople, marketers, and fundraisers to understand why people say yes. He identified six universal principles: reciprocity, commitment and consistency, social proof, authority, liking, and scarcity. Each principle is backed by research and explained with examples that range from door-to-door sales to charitable donations to political propaganda. Understanding these principles makes you both more effective as a communicator and more resistant to manipulation.
Key Takeaways
- 1Reciprocity: people feel obligated to return a favor — giving first creates powerful pull
- 2Commitment and consistency: once someone agrees to a small ask, they are more likely to agree to a larger one
- 3Social proof: people look to others to decide what is correct — especially under uncertainty
- 4Authority: people defer to credible experts; signals of expertise (titles, clothes, credentials) trigger compliance
- 5Liking: people say yes to people they like — similarity, compliments, and familiarity all increase liking
- 6Scarcity: things become more desirable when they are rare or becoming unavailable