Groups tend to be more extreme than individuals.

The amount of success it takes for leaders to become overconfident isn't terribly large.

Many people will admit that they made a mistake [putting money in dot-coms or telecoms at their peak] But that doesn’t mean that they’ve changed their mind about anything in particular. It doesn’t mean that they are now able to avoid that mistake.

In a rising market, enough of your bad ideas will pay off so that you'll never learn that you should have fewer ideas.

If people do not know what is going to make them better off or give them pleasure, then the idea that you can trust people to do what will give them pleasure becomes questionable.

It doesn't take many observations to think you've spotted a trend, and it's probably not a trend at all.

Intelligence is not only the ability to reason; it is also the ability to find relevant material in memory and to deploy attention when needed.