How important is temperament in investing?
A lot of people with high IQs are terrible investors because they've got terrible temperaments. And that is why we say that having a certain kind of temperament is more important than brains. You need to keep raw irrational emotion under control. You need patience and discipline and an ability to take losses and adversity without going crazy. You need an ability to not be driven crazy by extreme success.

How should most individual investors invest?
Our standard prescription for the know-nothing investor with a long-term time horizon is a no-load index fund. I think that works better than relying on your stock broker. The people who are telling you to do something else are all being paid by commissions or fees. The result is that while index fund investing is becoming more and more popular, by and large it's not the individual investors that are doing it. It's the institutions.

What about people who want to pick stocks?
You're back to basic Ben Graham, with a few modifications. You really have to know a lot about business. You have to know a lot about competitive advantage. You have to know a lot about the maintainability of competitive advantage. You have to have a mind that quantifies things in terms of value. And you have to be able to compare those values with other values available in the stock market. So you're talking about a pretty complex body of knowledge.

What do you think of the efficient market theory, which holds that at any one time all knowledge by everyone about a stock is reflected in the price?
I think it is roughly right that the market is efficient, which makes it very hard to beat merely by being an intelligent investor. But I don't think it's totally efficient at all. And the difference between being totally efficient and somewhat efficient leaves an enormous opportunity for people like us to get these unusual records. It's efficient enough, so it's hard to have a great investment record. But it's by no means impossible. Nor is it something that only a very few people can do. The top three or four percent of the investment management world will do fine.

What would a good investor's portfolio look like? Would it look like the average mutual fund with 2% positions?
Not if they were doing it Munger style. The Berkshire-style investors tend to be less diversified than other people. The academics have done a terrible disservice to intelligent investors by glorifying the idea of diversification. Because I just think the whole concept is literally almost insane. It emphasizes feeling good about not having your investment results depart very much from average investment results. But why would you get on the bandwagon like that if somebody didn't make you with a whip and a gun?

Is finding bargains difficult in today's market?
We wouldn't have $45 billion lying around if you could always find things to do in any volume you wanted. Being rational in the investment world at a time when other people are losing their minds -- usually all it does is keep you out of something that causes a lot of trouble for other people. If you stayed away from the mania in the high-tech stocks at its peak, you were saved from disaster later, but you didn't make any money.

Should people be investing more abroad, particularly in emerging markets?
Different foreign cultures have very different friendliness to the passive shareholder from abroad. Some would be as reliable as the United States to invest in, and others would be way less reliable. Because it's hard to quantify which ones are reliable and why, most people don't think about it at all. That's crazy. It's a very important subject. Assuming China grows like crazy, how much of the proceeds of that growth are going to flow through to the passive foreign owners of Chinese stock? That is a very intelligent question that practically nobody asks.

What do you think of the U.S. trade and budget deficits -- and their impact on the dollar, which Berkshire is still betting against?
It's not at all clear exactly from some objective bunch of economic data just where the dollar ought to trade compared to the Euro. Who in the hell knows? It's clear that you can't run twin deficits on the scale that the U.S. has forever. As [economist] Herb Stein said, "If something can't go on forever, it will eventually stop." But knowing just when it's going to stop is a very difficult matter.

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