Influence: The Psychology of Persuasion
by Robert B. Cialdini · 1984
The TL;DR
Cialdini's six universal levers of human persuasion — reciprocity, commitment and consistency, social proof, authority, liking, and scarcity — are backed by decades of behavioral research and field studies. Reciprocity means people repay in kind, so give first. Commitment and consistency means small public commitments lead to larger private ones. Social proof means we look to others to determine what's correct, especially when uncertain. Authority means credible experts shift opinion rapidly. Liking means we say yes to people we know and like. Scarcity means limited opportunities seem more valuable. Understanding these levers protects you from manipulation and helps you communicate, sell, and lead more effectively.
Core ideas
- 1Reciprocity: people repay in kind. Give first.
- 2Commitment & Consistency: small public commitments lead to larger ones.
- 3Social proof: we look to others to decide what's correct.
- 4Authority: credible experts shift opinion fast — show credentials.
- 5Scarcity: items and opportunities become more desirable when limited.
Key quotes
"People prefer to say yes to those they know and like."
"Opportunities seem more valuable to us when they are less available."
"We are obligated to give back to others the form of behavior that they have first given to us."
Apply it this week
- →Front-load value before you ask anyone for anything.
- →Use customer logos and quantified usage as social proof on landing pages.
- →Get a small public 'yes' before the big ask.