Cipolla categorizes behavior into four types based on gains/losses for oneself and others:
Stupid people are the most dangerous type because their irrational actions are unpredictable. Cipolla's Matrix of Human Behavior The basic laws of human stupidity
Non-stupid people fail to realize how costly dealing with stupid people is. Cipolla categorizes behavior into four types based on
A stupid person causes losses to others without gaining anything themselves. The basic laws of human stupidity