Poorly designed incentives will cause bad behaviors. In pursuit of his own self-interest, man will rationalize bad behavior. excised normal gallbladders. Did this surgeon think, ‘I can get some easy cash by fraudulently excising gallbladders?’ No, “he thought the gallbladder was the source of all evil.

In prehistoric days when we had to avoid getting devoured by lions, these fast heuristics worked pretty well. Now that life is more complex, the decisions you need to make are more complex, and your cognitive biases trick you into making bad decisions. By learning these biases, you’ll guard yourself against people trying to exploit you. Even better, you’ll guard against your worst enemy: your own