Six levers — and they are not equal
The famous six principles of influence — reciprocity, commitment, social proof, authority, liking, scarcity — are usually presented as six equivalent laws. They are not. Reciprocity, commitment and social proof have strong support; authority and liking are real but more variable; and scarcity effects are the shakiest, being highly context-dependent and easily backfiring.
What each one actually is
- Reciprocity — receive something, feel obliged to give back. Powerful even when the gift was unrequested and worthless. The free sample is not generosity; it is an opening move.
- Commitment & consistency — once you take a small step, you act to stay consistent with it. This is the foot in the door, and it is quietly the strongest of the six.
- Social proof — you copy others, especially when uncertain or when they resemble you.
- Authority — you defer to perceived expertise and its symbols — the title, the uniform, the white coat. Real, but see how badly the famous study is misread.
- Liking — you say yes to people you like, find attractive, or see as similar. Which is why the salesperson mentions they also have a labrador.
- Scarcity — you want what is limited. Genuinely effective in some contexts, and obviously fake urgency now often produces suspicion and backfire, particularly online. See the honest page.
Every one is a useful shortcut in normal life. Reciprocity holds societies together. Copying others is usually smart. Deferring to experts is efficient. Wanting rare things tracks real value.
The shortcuts are not flaws — they are features, and that is precisely why they are exploitable. A persuader does not install anything new in you. They simply press a button you already have.
The honest caveat about this whole field
Much of classic social psychology took heavy damage in the replication crisis. Some influence effects hold up robustly; others are smaller, more fragile, or more context-dependent than the bestselling books imply. Anyone presenting all six as iron laws with equal footing is selling a book, not reporting a literature.
Keep going
More from this wing: all 8 pages · related: manipulation tactics, the bias explorer, friction.
Frequently asked
What are the six principles of influence?
Are all six principles equally well supported?
Why do influence techniques work on us?
Sources & further reading
- Cialdini’s principles, summary — reciprocity, commitment/consistency, social proof, authority, liking, scarcity — are drawn from decades of compliance research, including his own door-in-the-face experiments (1975). Cialdini’s principles, summary ↗
- Read any influence claim with the replication record in mind: the Open Science Collaboration (2015) found only 36% of 100 replications significant against 97% of originals — social psychology fared worse than cognitive. Compliance techniques held up better than priming effects, but treat dramatic single studies with caution. Reproducibility Project, 2015 ↗
- Multiple meta-analyses (Beaman et al., 1983; Dillard, Hunter & Burgoon, 1984; Fern, Monroe & Avila, 1986) confirm foot-in-the-door and door-in-the-face work — while showing the effects are modest and condition-dependent, not magic. Compliance meta-analyses, archived PDF ↗
Educational content, not professional advice. Last reviewed July 2026.