You must value the business in order to value the stock.

You need a different checklist and different mental models for different companies. I can never make it easy by saying, 'Here are three things.' You have to derive it yourself to ingrain it in your head for the rest of your life.

Capitalism is a pretty brutal place.

Some years ago one oil company bought a fertilizer company, and every other major oil company practically ran out and bought a fertilizer company. And there was no more damned reason for all these oil companies to buy fertilizer companies, but they didn't know exactly what to do, and if Exxon was doing it, it was good enough for Mobil and vice versa.

If the value of a company doesn't just scream out at you, it's too close.

We want very good leaders who have a lot of power.

Berkshire has the lowest turnover of any major company in the U.S.The Walton family owns more of Wal-Mart than Buffett owns of Berkshire, so it isn't because of large holdings. It's because we have a really unusual shareholder body that thinks of itself as owners and not holders of little pieces of paper.