You never know exactly how new policies are going to work. That doesn't mean you shouldn't try them.

Their [American banks] big issue will be if they want to deal with the biggest companies, which are doing a lot of business overseas. How they do that is a big question. It's almost impossible to build a global investment bank from scratch. If they want to do that, they probably will have to do an acquisition.

That's probably good, all things being equal, for emerging markets, not bad, even though it may not be great for all their currencies.

I also think you have to be very careful. I mean, the heritage of our company is very strong, and building some of these businesses into leading players is extremely tough. You and I can both build a trading business, and it looks like you're doing OK, and it looks like I'm doing OK. But, really, I am, and you aren't. It comes down to the quality of clients, quality of systems, quality of risk controls.

A lot of these things have hurt the average American. When they look at the banks and they say, "Well, the bank's talking its own game," I am telling you, what we've done in mortgage lending, our inability to have proper regulations around mortgages, has hurt average Americans. First-time buyers, immigrant buyers, prior defaults, self-employed, because they can't get a mortgage. Will it make a big difference to JPMorgan Chase? No, but you're hurting my fellow citizens. Let's go at it, and let's fix it.

Finance went from being a small business, effectively, to being a big business. In part, that's the growth of the world's wealth. That's called savings.

Capping the size of American banks won't eliminate the needs of big businesses; it will force them to turn to foreign banks that won't face the same restrictions.