Module 8 · Influence & persuasion · Lesson 4 of 11

Why people say yes

Cialdini’s persuasion principles: shortcuts every mind uses.

7 min read · Level: Practising · Free — no account needed to read

The idea

Robert Cialdini described mental shortcuts that make people more likely to say yes: reciprocity (we return favours), commitment and consistency (we stick with what we said), social proof (we follow others), authority (we trust experts), liking (we agree with people we like), scarcity (rare things seem valuable) and unity (we trust people we feel part of).

These shortcuts exist because they usually work — following experts and returning favours are sensible most of the time. Understanding them helps you persuade honestly and, just as importantly, notice when they are being used to pressure you.

Why it matters

Knowing why people say yes makes you both a clearer communicator and a harder target for pressure.

See it happen

A charity volunteer gives Rehana a small free pen and then asks for a donation.

The first reaction

She feels she ought to give, since she accepted the pen.

With the idea

She recognises reciprocity at work, returns the pen politely, and decides separately whether she wants to support the charity.

What changed

Naming the shortcut let her decide freely rather than on autopilot.

Easy to get wrong

• Using the principles as tricks to pressure people.
• Believing you are immune to them because you know about them.

Different perspectives

Reasonable people disagree here. None of these is presented as the answer.

Well-supported tendencies

Many studies show these shortcuts influence decisions, and they are visible in everyday life from advertising to friendships.

Weaker than they sound

Some classic findings replicate less strongly than first reported, and effects depend heavily on context. They are tendencies, not switches.

Where this comes from: Robert Cialdini — Influence (1984, expanded 2021).

Try it now: Spot them

1. Think of the last advert or sales pitch you saw.
2. Write which of the seven principles it used.
3. Write how you might use one of them honestly, for something good.

Questions to think about

• Which of these shortcuts are you most influenced by?
• Where have you used one of them without realising?

Your challenge this week

For one week, notice every time someone uses one of these principles on you — write one down.