Bubbles are best identified by credit excesses, not valuation excesses. And there's no bigger credit excess than in China.

Chinais a world class if not the world class property bubble, primarily high-rise buildings, offices and condos.

What people don't realize is that China papered over its last two credit bubbles, those in 1999 and 2004. The banks were never bailed out - they just exchanged their bad loans for questionable bonds from quasi-state organizations.

Healthcare is growing now at about 10 per cent per annum in the U.S. top line, versus 3 per cent for the economy. As someone with a sharp pencil and an eye for this kind of thing, this can't last.

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.

In China, remember, the the banks are arms of state policy. They loan because the local party official or regional party official tells them we need a new stadium. They are instruments of state policy.

And so it can be very much in the interest of bank A to sell-short bank B shares, or buy CDSes on bank B, because they have exposure to bank B. It's the responsible thing to do as a fiduciary, and yet if everyone does it at the same time, it's destabilizing because everyone is selling.