NOURIEL ROUBINI

I've nothing against Goldman Sachs. But Goldman Sachs isn't an investment bank. Goldman Sachs is a hedge fund. It's bigger than any hedge fund. It's more leveraged, to the power of three or five, than any hedge fund.

The economic costs, the financial costs, the job losses, the income losses, the fiscal costs of bailing out financial system are becoming larger and larger.

I don't personally consider myself Dr. Doom. I call myself Dr. Realist, even though it's less exciting and more boring than being called Dr. Doom. If you are consistently saying 'the world is going to end,' who is going to listen to you?

I love and collect contemporary art and go to all the art fairs. I love Damien Hirst and Matthew Barney. I grew up in Italy and had a humanistic education in philosophy and literature - things I love and appreciate. People are richer and more complex than just their day-to-day professional pursuits might suggest.

Having spent 10 years studying emerging markets, I know that you have patterns repeated over and over again. A bubble is like a fire which needs oxygen to continue... when you see there is no oxygen, things change.

Among the social media - I've tried them all - Facebook is a bit of a game, but Twitter is a productivity tool. I use it regularly and I'm addicted to it.

The trouble is that the average trader on Wall Street, he or she is so young, he doesn't even remember the recession of 2001, let alone the previous one.

For me, geopolitical issues are becoming more important, because how can you understand economy if you don't understand geopolitics? People think economists just deal with spreadsheets and charts. That's a narrow-minded caricature.

If we didn't have greed, market economies wouldn't be as innovative as they are. But in my view, greed has to be contained by the fear of losses, so there has to be a system where, if you take too much risk, you go into bankruptcy. You don't systematically bail out people who take excessive risks.

A home is a home, and excess supply leads to prices falling.

My family is a Jewish Iranian family, but I was born in Turkey and raised in Italy. So it's a very mixed background.

I have more concerns about potential risks and vulnerabilities than most people.

In an extreme credit crunch, leveraged purchases of gold cause forced sales, because any price correction triggers margin calls. As a result, gold can be very volatile - upward and downward - at the peak of a crisis.

I believe investors should invest for the long run, so I don't buy and sell. I usually maintain the classic index of global equities, diversified U.S. and global and emerging markets, and when the risk is larger, I diminish the amount in global equities and put more into liquid assets - but very irregularly.

I'm not a pessimist by nature. I'm not someone who sees things in a bleak way.

I'm a rock star among geeks, wonks, and nerds.

What is important to me is that when I write something, people listen to me. I provide my wisdom to people, whether they agree or not.

I am quite international. My background, born in Turkey. My family is a Jewish family from Iran, so I went from Turkey to Iran to Israel, and then grew up in Italy and ended up in U.S. for graduate school. So I tend to look at things from an international perspective, and I think that gives you a little bit of a broader view of what's going on.

The global financial crisis - missed by most analysts - shows that most forecasters are poor at pricing in economic/financial risks, let alone geopolitical ones.

I believe, unlike people that are totally free-market, laissez-faire fundamentalists, that there is an important role that the government can play - one, in providing public goods, whether it's education, health care, or other things, and two, supervising countercyclical policy - stimulus, whether it's monetary, fiscal, or otherwise.

I think it's true that the 1 Percent or the elite are living in a world of, maybe, excessive privilege, and they don't fully realize how much pain and suffering, how much anxiety exists out there.

What we need to understand is, one, that there are market failures; and two, that there are things like asset bubbles and irrational exuberance. There are periods of booms, bubbles, and manias. These things, if left to themselves, can lead to crashes, to busts, to panics.

Once you run current-account deficits, you depend on the kindness of strangers. This might be the beginning of the end of the American empire.

If you worry about financial Armageddon, it is indeed metaphorically the time to stock your bunker with guns, ammunition, canned food and gold bars.

Celebrity has become a burden. There are more demands on your time. People think it is glamorous to fly places. But it is not - even if you travel business class and stay in wonderful hotels, you end 10,000 miles away from home.