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

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.

The U.S. has been living in a situation of excesses for too long. Consumers were out spending more than their income and the country was spending more than its income, running up large current-account deficits. Now we have to tighten our belts and save more.

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.

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

I am just a normal human being - I am alive! Why is anyone surprised that I am human? Like many New Yorkers, I have a multifaceted life.

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

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

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

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

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

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.

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.

A currency serves three functions: providing a means of payment, a unit of account and a store of value. Gold may be a store of value for wealth, but it is not a means of payment. You cannot pay for your groceries with it. Nor is it a unit of account. Prices of goods and services, and of financial assets, are not denominated in gold terms.

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.

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.

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.

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.

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.

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.