Worse Than Enron?

``I was trying to answer the simple question that you'd think regulators should want to know: how much of each bank's revenue is derived from trading (taking risk) vs. other businesses? And how can you compare it across the industry-so you can contain all that systemic risk? Only, there's no uniformity across books. And, given the complexity of these mega-merged firms, those questions aren't easy to answer.''