Unbridled capitalism will lead to some very real problems.

Cash is very easy to hide. It's easy to hoard. It's easy to move, especially these large bills.

The Indians and Chinese have become brilliant chess professionals. They get on a plane and play all over the world. This has led to dramatic pressure on incomes. Nowadays, the best chess player in Argentina can no longer make a living playing chess.

It comes as no surprise that average Americans have a different perception of the economy than (US President) George W. Bush and his friends. They can play around with statistics as much as they want, but it's clear that we have an unfair distribution of wealth.

Workers are not being exploited. But if their share of growth doesn't increase, this could be a potential cause of social tension worldwide.

Unbridled capitalism in the United States can't be sustained socially. It leads to tensions.

We all use cash in our everyday life, but we don't use hundred-dollar bills. We're not using 500-euro notes. And yet these account for mountains of cash out there. I think they're being used in tax evasion and by criminals of all types.