Man is a “’social animal,’ greatly and automatically influenced by behavior he observed in men around him. I also knew that man lived, like barnyard animals and monkeys, in limited size dominance hierarchies, wherein he tended to respect authority and to like and cooperate with his own hierarchy distrusting others.

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