In the post Volcker Rule Would Cause Irreparable Damage to The Muppets – And Much More Broadly, Simon Johnson writes:
This, of course, is elementary economics – dating back as far as Adam Smith. If there is a profit-making opportunity to be had, then everyone will spurn it, unless they work for a massive international bank.
For those readers who are irony challenged, I suggest you look up tongue-in-cheek in WikiPedia.