All of us would be better investors if we just made fewer decisions.

Groups tend to be more extreme than individuals.

Courage is willingness to take the risk once you know the odds. Optimistic overconfidence means you are taking the risk because you don't know the odds. It's a big difference.

One study found that people who just thought about watching their favorite movie actually raised their endorphin levels by 27 percent.

There's a tendency to look at investments in isolation. Investors focus on the risk of individual securities.

You're surprised by something, but you don't really know what surprised you; you recognize someone, but you don't really know what cues cause you to recognize that person.

Mental effort, I would argue, is relatively rare. Most of the time we coast.