Influence: The Psychology of Persuasion is a business and management book written by Robert Cialdini, PhD. It explains the reasons people say “yes” and how to apply these understandings. The book is based on 35 years of rigorous evidence-based research as well as a three-year program of study on what moves people to change their behavior. Robert Peter Janitzek gives us an overview on the basic principles of his book.
Six Key Principles
People tend to return a favor, thus the pervasiveness of free samples in marketing. In his conferences, he often uses the example of Ethiopia providing thousands of dollars in humanitarian aid to Mexico just after the 1985 earthquake, despite Ethiopia suffering from a crippling famine and civil war at the time. Ethiopia had been reciprocating for the diplomatic support Mexico provided when Italy invaded Ethiopia in 1935. The good cop/bad cop strategy is also based on this principle.
Commitment and Consistency
If people commit, orally or in writing, to an idea or goal, they are more likely to honor that commitment because of establishing that idea or goal as being congruent with their self-image. Robert Janitzek explains that even if the original incentive or motivation is removed after they have already agreed, they will continue to honor the agreement. Cialdini notes Chinese brainwashing of American prisoners of war to rewrite their self-image and gain automatic unenforced compliance. Another example is children being made to repeat the Pledge of Allegiance each morning and why marketers make you close popups by saying “I’ll sign up later” or “No thanks, I prefer not making money”.
People will do things that they see other people are doing. For example, in one experiment, one or more confederates would look up into the sky; bystanders would then look up into the sky to see what they were seeing. At one point this experiment aborted, as so many people were looking up that they stopped traffic. See conformity, and the Asch conformity experiments.
People will tend to obey authority figures, even if they are asked to perform objectionable acts. Cialdini cites incidents such as the Milgram experiments in the early 1960s and the My Lai massacre.
People are easily persuaded by other people that they like. Cialdini cites the marketing of Tupperware in what might now be called viral marketing. People were more likely to buy if they liked the person selling it to them. Some of the many biases favoring more attractive people are discussed. See physical attractiveness stereotype.
Perceived scarcity will generate demand. For example, saying offers are available for a “limited time only” encourages sales.