Influence: The Psychology of Persuasion (1984) | Robert Cialdini

When you see a source get quoted over and over again, you get a reaction of "I have to see this." Social Proof. And It has stood beatings of time, having been published 33 years ago.

That was what happened.

The way its presented is like a self-defense kind of a book. In this case, the black arts of influence and compliance professionals. (That was exaggerating it a bit but) the same way gunpowder can be misused as fireworks or bullets; Influence can be used for good and terrible purposes.

Cialdini described key principles or weapons of Influence.


Reciprocation – These are basically gifts. People have a tendency to return favors. So some compliance pro’s present things as a gift or favor before selling something.

  • How to defend against it: Say no in the first place. In practice, once you realize something is being given as a favor in exchange of something, redefine out loud that what is being given as “not a gift but a sales device” and if they counter with a concession (these are what seems like smaller requests, or in exchange for..) mention that it’s a compliance tactic.


Commitment and Consistency – These are tricks that make you commit to something whether orally and in writing, and then using that commitment to make requests. People have a tendency to follow commitments even if original terms are removed.
  • How to defend against it: Listen to your gut. And answer if terms change suddenly; ask yourself if you knew what you know now, would you make the same decision?


Social Proof – People look to others' behaviours on how to act; especially so on contexts of uncertainty and similarity. When people are uncertain they follow the crowd. When people perceive something as similar to them, people will have a bias toward that similarity.
  • How to defend against it: Recognize when social evidence has been faked. To try to prevent from following with the herd, look around and check other sources of evidence. Look into facts, your prior experiences and your own judgment.


Liking – People have a tendency to be persuaded by people that they like. Factors that can induce liking are attractiveness, familiarity, association.
  • How to defend against it: Recognize the feeling of liking when it is being produced too much, and too fast.  Ask yourself; Have i come to like this _ some minutes/days ago? If the answer is yes, too well, then that’s the signal. Then separate the deal with the dealer.


Authority – People have a tendency to follow expert or authority figures. Compliance practitioners manufacture this by posing as somewhat of an expert for a given field; carefully picking titles, clothes, and/or trappings like cars and access to well-known people.
  • How to defend against it: Ask yourself “Is this authority truly an expert?” If yes, ask in the context of the situation, “How truthful can we expect the expert to be here?” One compliance practitioner tactic is they will seem to argue to a degree against their own interests.

Scarcity - Opportunities seem more valuable to us when their availability is limited.
  • How to defend against it: Cialdini suggests a two stage sequence. One; Use the signal of emotional arousal to stop. Keep calm and regain perspective. Second; determine why you want the item in consideration; strictly for possession or for its utility? If solely for the purpose of owning it, use the availability how much to spend on it. If solely for its function, remember that it will function equally well whether scarce or plentiful.


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