When you build a bridge, you insist that it can carry 30,000 pounds, but you only drive 10,000-pound trucks across it. And that same principle works in investing.

Does the business have favourable long term prospects?

You are neither right nor wrong because the crowd disagrees with you.

You don't need to be an expert in order to achieve satisfactory investment returns. But if you aren't, you must recognize your limitations and follow a course certain to work reasonably well. Keep things simple and don't swing for the fences.

I’ve worked in an economy that rewards someone who saves the lives of others on a battlefield with a medal, rewards a great teacher with thank-you notes from parents, but rewards those who can detect the mispricing of securities with sums reaching into the billions.

I mean, you can explain the fact that these are depressed prices, you know. We think these assets are going to be worth a lot more. And I think that case can be made in certain situations. But I think to just say, you know, we're going to say a dollar of cash is worth $2 all of a sudden, it isn't worth $2. It's worth a dollar today.

The optimum portfolio depends on the various expectations of choices available and the degree of variance in performance which is tolerable. The greater the number of selections, the less will be the average year-to-year variation in actual versus expected results. Also, the lower will be the expected results, assuming different choices have different expectations of performance.