To better avoid errors, you should talk to people who disagree with you and you should talk to people who are not in the same emotional situation you are.

However, optimism is highly valued, socially and in the market; people and firms reward the providers of dangerously misleading information more than they reward truth tellers. One of the lessons of the financial crisis that led to the Great Recession is that there are periods in which competition, among experts and among organizations, creates powerful forces that favor a collective blindness to risk and uncertainty.

Groups tend to be more extreme than individuals.

That's one of the real dangers of leader selection in many organizations: leaders are selected for overconfidence.

You should not take your intuitions at face value.

People who are cognitively busy are also more likely to make selfish choices, use sexist language, and make superficial judgments in social situations.

When you are under time pressure for a decision, you need to follow intuition.