To know whether you can trust a particular intuitive judgment, there are two questions you should ask: Is the environment in which the judgment is made sufficiently regular to enable predictions from the available evidence? The answer is yes for diagnosticians, no for stock pickers. Do the professionals have an adequate opportunity to learn the cues and the regularities? The answer here depends on the professionals' experience and on the quality and speed with which they discover their mistakes.

Negotiations over a shrinking pie are especially difficult because they require an allocation of losses. People tend to be much more easygoing when they bargain over an expanding pie.

If there is time to reflect, slowing down is likely to be a good idea.

In essence, the optimistic style involves taking credit for successes but little blame for failures.

Question: So investors shouldn't delude themselves about beating the market? Answer: "They're just not going to do it. It's just not going to happen."

People are really happier with friends than they are with their families or their spouse or their child.

A large portion of the weekend effects is explained by differences in the amount of time spent with friends or family between weekends and weekdays.