Influence: The Psychology of Persuasion
Six universal principles of persuasion: reciprocity, commitment, social proof, authority, liking, and scarcity. Ostensibly about marketing, but the implications for investing are enormous. Every bubble is social proof in action. Every pump-and-dump exploits authority and scarcity. Munger considers it essential reading for understanding why markets behave the way they do.
Cialdini's six principles fit on an index card; the book stretches them across three hundred pages of anecdote. Worse, a chunk of the social psychology underneath comes from the era whose lab findings later failed to replicate, and each new edition adds padding rather than rigor. Read it as a field guide to manipulation, not as settled science.
The case for it and the rest of the canon open with Pro.
