Robert Cialdini is a psychologist who studied how people get influenced to say “yes” to things. He discovered six (later seven) universal shortcuts—or “principles”—that professionals (salespeople, marketers, politicians, fundraisers, even scammers) use to persuade us quickly. These work because our brains love mental shortcuts; we can’t think deeply about every decision, so we rely on these triggers.
- Reciprocity
“If I do something nice for you, you feel like you owe me.”Charities send free address labels → you feel guilty and donate. Someone does you a favor? You’re much more likely to say yes when they ask for something later. - Commitment and Consistency
“People want to look consistent with what they’ve already said or done.”
Example: If you get you to say publicly “I’m someone who cares about the environment,” you’re way more likely to donate to a green cause later. That’s why petitions work—even if it’s just a signature, once you’ve committed in a small way, you’ll keep saying yes to stay consistent. - Social Proof
“If everyone else is doing it, it must be right.”
Example: Nightclubs put a fake line outside even when empty. Hotels say “75% of guests reuse their towels” → you reuse yours. - Liking
“We say yes to people we like.”
Simple: We’re more persuaded by attractive people, people who compliment us, people who seem similar to us, or people we’ve worked with (Tupperware parties were genius at this). Car salespeople first try to become your “friend.” - Authority
“We obey people who seem like experts or bosses.”
Example: “9 out of 10 dentists recommend…” or putting “Dr.” in front of a name, uniforms, fancy titles, even just a stethoscope around the neck in an ad makes us trust blindly. The famous Milgram experiment showed how far authority can push people. - Scarcity
“If it’s rare or going away, we want it more.”
Example: “Only 3 seats left at this price!” or “Limited edition.” Black Friday sales, “closing-down sale” signs (even when the store never actually closes), or “last chance” emails—all trigger panic that we might miss out. - Unity (the newer one Cialdini added)
“We say yes to people who feel like ‘one of us’—shared identity.”
Example: “Fellow alumni,” “We’re both parents,” “People from our hometown,” or even “We both love the same soccer team.” When someone emphasizes a shared group or identity, you trust them more and are more easily persuaded.
Why do these work so well in propaganda?
Because they’re mental shortcuts (heuristics) that usually help us make decent decisions fast in a complicated world. Propaganda, advertising, and influence professionals just figured out how to trigger them on purpose.
The cool (and slightly scary) part: Once you know these seven principles, you start seeing them everywhere—on the news, in political campaigns, in fundraising letters, even in arguments with your partner!
Knowing them doesn’t make you immune, but it does let you pause and ask, “Wait… am I saying yes because it’s actually a good idea, or because one of these tricks just got pulled on me?”