Everybody needs money. That's why they call it money.

From full global headquarters, this is Motley Full Money.

Welcome to Motley Full Money, I'm Chris Hill.

You know, each week here on Motley Full Money, we dig into the numbers of business as we analyze the latest headlines and the stocks that are on our radar.

But Warren Buffett, the greatest investor in modern times, has said the most difficult thing he had to master as an investor was not numbers or analysis.

It was his temperament.

So this week we've got a special edition of Motley Full Money on Tap, three of our favorite interviews all dealing with investment behavior.

We've got Christopher Shabrie, author of the Invisible Gorilla, Dan Arieli on the upside of irrationality.

But we begin with best-selling writer Jonah Lehrer, the author of How We Decide.

So the book is organized around two questions.

How does the human mind make decisions and how can we make those decisions better?

Let's just start with the first one. How do we decide?

Well, it turns out the brain has two basic ways to make decisions.

On the one hand, we all know we can be rational. Sometimes we can be deliberate. We can crunch the numbers.

We can read the Wall Street Journal. We can, you know, make a long list of pros and cons.

So that's one way to make a decision. That turns out to rely on a part of the brain called the prefrontal cortex.

It's that nub of flesh just behind your forehead.

But we also know that we can use our emotions. We can trust our instincts.

We can not think at all and still make decisions. Just go with what feels best.

And that relies on a whole different system in the brain.

So those are the two basic ways we make decisions.

And it turns out when you look at the brain and look at all these experimental recent decades,

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