James Surowiecki says U.S. voters should support a new Consumer Financial Protection Bureau (C.F.P.B.) because consumers make finance mistakes: Many Americans are ill informed about financial products. … You might think that businesses offering better products would have an incentive to make sure that potential customers were able to distinguish between ripoffs and good deals, but … there’s “a limit to how much explaining a creditor can do before losing the attention of its customers.” … Warren … talked to a number of banks about introducing a credit card with a higher up-front interest rate but lower penalty fees—a cost-effective arrangement for many people. But … there was no way to convince consumers that it was a good deal. In a world where marketing is all about the lowest teaser A.P.R., … you end up with a race to the bottom. …