I see almost no change in the price of the composite product that flows through Costco I don't feel sorry for the people who pay $27 million for an 8,000-square-foot condo in Manhattan. So inflation comes in places.

Failure to handle psychological denial is a common way for people to go broke: you have made an enormous commitment to something. You have poured effort and money in. And the more you put in, the more that the whole consistency principle makes you think, "Now it has to work. If I put in just a little more, then it will work."

If the same family were always on the bottom, then you'd have big resentments. But if DuPonts go down and Pampered Chef up, [that's good]. That much churn makes people think the system is fairer. Buffett: We don't like churn now, but we liked it more 30-40 years ago.

How you behave in one place, will help in surprising ways later.

...in terms of business mistakes that I've seen over a long lifetime, I would say that trying to minimize taxes too much is one of the great standard causes of really dumb mistakes. I see terrible mistakes from people being overly motivated by tax considerations. Warren and I personally don't drill oil wells. We pay our taxes. And we've done pretty well, so far. Anytime somebody offers you a tax shelter from here on in life, my advice would be don't buy it.

Size will hurt returns. Look at Berkshire Hathaway - the last five things Warren has done have generated returns that are splendid by historical standards, but now give him $100 billion in assets and measure outcomes across all of it, it doesn't look so good. We can only buy big positions, and the only time we can get big positions is during a horrible period of decline or stasis. That really doesn't happen very often.

Common stock investors can make money by predicting the outcomes of practice evolution. You can't derive this by fundamental analysis - you must think biologically.