It is vital for officials and regulators to have input from people within our businesses who understand the intricacies of how financial markets operate and the consequences of certain policy decisions.

The economic union - creating a big common market, like the United States, so that you can compete across borders. There are common rules, regulations, and simplification, and that is still a good reason, too. When they put their monetary union together, that created a rigidity that made it hard for currency fluctuations. They don't really have a solution to that.

People need to understand: Businesses are going to make mistakes. They shouldn't be shot and hung every time. We should apologize for it. We should make up for it. My shareholders paid for it. No customer was hurt, which is critical to me. But I hurt my shareholders, and I wish I hadn't.

I learn from all our major competitors, whether they're in or out of the U.S. Wells Fargo is very actively, very aggressively, and very successfully building its U.S. investment bank.

From my point of view, the American financial system - including banks and investment banks - is far safer because of capital and liquidity requirements. Despite all the turbulence so far this year, I don't think anyone's questioning our system. And that, obviously, is a good thing.

I've always been a ... believer in good regulation.

Dodd-Frank and independent actions of banks go a long way in terms of progress on capital, liquidity, transparency, "living wills" (plans for winding down a bank in the event of a collapse) and resolutions.