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.

I rely a great deal on animal instincts.

If the bubbles contain a misconception, as they always do, then it can't be maintained forever.

America felt victorious and generous after World War II. They had also learned from the mistakes after World War I when they imposed punishment on Germany. What became of Germany? A Nazi dictatorship which threatened the world. Today's Germany doesn't feel as prosperous and generous as America then. But actually, Germany still is very prosperous.

We must recognize that as the dominant power in the world we have a special responsibility. In addition to protecting our national interests, we must take the leadership in protecting the common interests of humanity.

These public-private partnerships are very, very dangerous. The most rotten part of the financial system in the US consisted of the government sponsored entities, Fannie Mae and Freddie Mac. They really kicked off this crisis. The state should set the rules and enforce them - but not become involved as a market player.

Just as the process of repealing national alcohol prohibition began with individual states repealing their own prohibition laws, so individual states must now take the initiative with respect to repealing marijuana prohibition laws.