Psychology
Influence Summary & Review: The Psychology of Persuasion
Robert Cialdini's six psychological triggers that make people say yes automatically — reciprocity, commitment, social proof, liking, authority, scarcity — and how…
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Robert B. Cialdini
"The psychologist who reverse-engineered why people say yes."
Robert B. Cialdini is a psychologist and professor emeritus at Arizona State University whose book, Influence: The Psychology of Persuasion, became a foundational text in behavioral science and marketing by identifying the specific psychological principles that make people say yes. Drawing on years spent studying — and working undercover inside — sales organizations, cults, and fundraising operations, Cialdini distilled his findings into a set of core principles, including reciprocity, commitment and consistency, social proof, authority, liking, and scarcity, each exploiting an automatic mental shortcut that normally serves us well but can be triggered deliberately by skilled persuaders. His work is notable for treating persuasion as a science with identifiable, testable mechanisms rather than an innate talent, and for teaching readers to recognize these triggers both to use them ethically and to defend against manipulation.
1 book·Psychology & Persuasion
Books by Robert B. Cialdini
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Key Ideas & Recurring Themes
Reciprocity: give first
Cialdini identifies our automatic drive to repay favors as one of the most powerful persuasion triggers — a small, unsolicited gift or favor creates a sense of obligation that increases compliance later.
Commitment and consistency
Once people commit to a position, even a small one, they feel internal and social pressure to behave consistently with it, which persuaders can leverage by securing small initial commitments.
Effort increases perceived value
Cialdini shows that people who go through trouble or pain to attain something tend to value it more highly than those who get the same thing easily, a principle relevant to everything from initiation rituals to loyalty programs.
Notable Quotes
"A well-known principle of human behavior says that when we ask someone to do us a favor we will be more successful if we provide a reason. People simply like to have reasons for what they do."— Influence
"Persons who go through a great deal of trouble or pain to attain something tend to value it more highly than persons who attain the same thing with a minimum of effort."— Influence
"There is a natural human tendency to dislike a person who brings us unpleasant information, even when that person did not cause the bad news."— Influence
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Book Author Robert B. Cialdini
Influence Summary & Review: The Psychology of Persuasion
Robert Cialdini's six psychological triggers that make people say yes automatically — reciprocity, commitment, social proof, liking, authority, scarcity — and how to use or defend against each one.