Markets are imperfect. So you do need regulation, knowing that the regulators are also human.

An open society calls itself open to improvement. It is based on the recognition that people have divergent views and interests, and that nobody is in possession of the ultimate truth.

I used to be opposed to the idea of social entrepreneurship. I said, you know, let business be business, and philanthropy be philanthropy. Keep the two separate, don't mix it up, and this is what I did, and I did that rather successfully, but I now recognize that actually you do need to mix it up and I think there is room for social entrepreneurship.

As an anonymous participant in financial markets, I never had to weigh the social consequences of my actions ... I felt justified in ignoring them on the grounds that I was playing by the rules.

When you sell options, you get paid for assuming risk. That can be a profitable business, but it does not mix well with the risks inherent in a leveraged portfolio.

If investing is entertaining, if you're having fun, you're probably not making any money. Good investing is boring.

Law has become a business. Health care has become a business. Unfortunately, politics has also become a business. That really undermines society.