People always underestimate the ability of earth to increase its carrying capacity.

The number one idea is to view a stock as an ownership of the business and to judge the staying quality of the business in terms of its competitive advantage. Look for more value in terms of discounted future cash-flow than you are paying for. Move only when you have an advantage.

The basic concept of value to a private owner and being motivated when you're buying and selling securities by reference to intrinsic value instead of price momentum - I don't think that will ever be outdated.

Of course the self-serving bias is something you want to get out of yourself. Thinking that what's good for you is good for the wider civilization and rationalizing all these ridiculous conclusions based on this subconscious tendency to serve one's self is a terribly inaccurate way to think.

Warren spends 70 hours a week thinking about investing .

Our success has come from the lack of oversight we've provided, and our success will continue to be from a lack of oversight. But if you're going to provide minimal oversight, you have to buy carefully. It's a different model from GE's. GE's works - it's just very different from ours.

Economists get very uncomfortable when you talk about virtue and vice. It doesn't lend itself to a lot of columns with numbers. But I would argue that there are big virtue effects in economics. I would say that the spreading of double-entry bookkeeping by the Monk, Fra Luce de Pacioli, was a big virtue effect in economics. It made business more controllable, and it made it more honest.