John Maynard Keynes essentially said, don't try and figure out what the market is doing. Figure out a business you understand, and concentrate.

But 300 million Americans, their lending institutions, their government, their media, all believed that house prices were going to go up consistently. And that got billed into a $20 trillion residential home market. Lending was done based on it, and everybody did a lot of foolish things.

I'm not worried they're all about the investments we make. I mean, listen, this country - we've got $46,000 or $47,000 of GDP per capita. Now, we've done pretty darn well. We'll do better in the future.

Ben's Mr. Market allegory may seem out-of-date in today's investment world, in which most professionals and academicians talk of efficient markets, dynamic hedging and betas. Their interest in such matters is understandable, since techniques shrouded in mystery clearly have value to the purveyor of investment advice. After all, what witch doctor has ever achieved fame and fortune by simply advising 'Take two aspirins'?

I like to buy things I can understand. I do a lot of research on things.

If you've got the power to raise prices without losing business to a competitor, you've got a very good business. And if you have to have a prayer session before raising the price by a tenth of a cent, then you've got a terrible business. I've been in both, and I know the difference.

In the end we must have people to match our principles, not the reverse.