What we define as a bubble is any kind of debt-fueled asset inflation where the cash flow generated by the asset itself - a rental property, office building, condo - does not cover the debt incurred to buy the asset. So you depend on a greater fool, if you will, to come in and buy at a higher price.

Dubai was a property bubble. Plain and simple. Go to Dubai and see what happened. It was... what I call it the 'Edifice complex' - it's just, we can grow by putting up lots and lots of buildings and trying to attract people to come here, stay here, and put up offices here and sooner or later, you put up too many.

There's almost 70 billion in square feet under construction in high rises in commercial, residential and light manufacturing. And we estimate about 30 billion square feet, and that's with a 'B,' is commercial, that we would just consider office space. To put that in perspective, that's a 5x5-foot cubicle for every man, woman and child in China.

The interesting thing about the China story, getting back to the macro and micro, and as dire as I think the macro story is - due to bad credit and credit extension that makes Greece and Spain and the U.S. look like child's play - when you get to the micro of individual companies, they look even worse.

My first job ever was selling balloons with my brother at parades when I was about six years old. My father wanted us to learn about money, how to make it, save it, spend it, etc.

Our world faces many grave challenges: Widening conflicts and inequality. Extreme weather and deadly intolerance. Security threats - including nuclear weapons. We have the tools and wealth to overcome these challenges. All we need is the will.

The financial crisis revealed important weaknesses in many areas of our financial system.

The financial crisis of 2008 was not caused by investment banks betting against the housing market in 2007. It was caused by the fact that too few investors - including all of the big investment banks - bet too heavily on the housing market in the years before 2007.