I've heard that one-half of the students at elite schools want to go into private equity or hedge funds. They want to keep up with their age cohorts at Goldman. This can't possibly end well in terms of meeting these expectations.

A great business at a fair price is superior to a fair business at a great price.

Since those don’t hit financial reports, the opportunities you had but didn’t accept, most people don’t bother thinking about them very much. At least that is a mistake we don’t make. We rub our own noses in our mistakes in blowing opportunities, as we just did.

Wrigley is a great business, but that doesn't solve the problem. Buying great businesses at advantageous prices is very tough.

Finding a single investment that will return 20% per year for 40 years tends to happen only in dreamland. In the real world, you uncover an opportunity, and then you compare other opportunities with that. And you only invest in the most attractive opportunities. That's your opportunity cost. That's what you learn in freshman economics. The game hasn't changed at all. That's why Modern Portfolio Theory is so asinine.

I think the main figure that matters to all of us, including people in the media, is: How does GDP per capita grow? And those figures have been very good. There is a huge flux both up and down, so it isn't like we're all static in status. What's important is that pie grows.

Three rules for a career: 1) Don’t sell anything you wouldn’t buy yourself; 2) Don’t work for anyone you don’t respect and admire; and 3) Work only with people you enjoy.