Economists get very uncomfortable when you talk about virtue and vice. It doesn't lend itself to a lot of columns with numbers. But I would argue that there are big virtue effects in economics. I would say that the spreading of double-entry bookkeeping by the Monk, Fra Luce de Pacioli, was a big virtue effect in economics. It made business more controllable, and it made it more honest.

[GEICO] got to thinking that, because they were making a lot of money, they knew everything. And they suffered huge losses. All they had to do was to cut out all the folly and go back to the perfectly wonderful business that was lying there.

The possibility that stock value in aggregate can become irrationally high is contrary to the hard-form "efficient market" theory that many of you once learned as gospel from your mistaken professors of yore. Your mistaken professors were too much influenced by "rational man" models of human behavior from economics and too little by "foolish man" models from psychology and real-world experience.

Capitalism is a pretty brutal place.

The lawyers have escaped most criticism [and undeservedly so]. The tax shelters [were approved by lawyers, who got paid huge commissions to do so] and every miscreant had a high-falutin' lawyer at his side. Why don't more law firms vote with their feet and not take clients who have signs on them that say, "I'm a skunk and will be hard to handle?" I've noticed that firms that avoid trouble over long periods of time have an institutional process that tunes bad clients out. Boy, if I were running a law firm, I'd want a system like that because a lot of firms have a lot of bad clients.

You've got to have models in your head and you've got to array you experience - both vicarious and direct - onto this latticework of mental models.

Proper accounting is like engineering. You need a margin of safety. Thank God we don't design bridges and airplanes the way we do accounting.