Thinking books · Communication & persuasion · Robert Cialdini, 1984
Influence — the big ideas
Six principles that reliably produce compliance, documented from field research.
Free — no account needed to read
The big ideas
Reciprocity, commitment and consistency, social proof, liking, authority and scarcity. Each works largely below deliberate attention, which is why knowing them is a defence.
Commitment is the strongest and least noticed: a small public agreement makes a later larger one far more likely, and people justify it to themselves as their own choice.
Scarcity works on the fear of loss rather than the value of the thing, which is why a deadline changes behaviour when the price does not.
Read defensively, it is a list of the moments to stop and ask whether you would want this if the trigger were absent.
Practise it — no need to have read it
Find a purchase or commitment you made recently. Identify which of the six was operating, and whether you would have chosen it without that.
A hint: Sometimes yes. The ones where the answer is no are the useful ones.
Where it shows up in real life
- Sales conversations, both sides
- Negotiation
- Noticing manipulation
Described in our own words with the source named — never quoted, and not a substitute for reading the book.
The thinking it builds
- Critical Thinking — Evaluate claims and evidence
- Argumentation — Build and evaluate arguments