That the morality of the used car lot has been adopted by Wall Street is now abundantly clear. Citigroup recently settled a civil complaint in which it was accused of selling mortgage-related investments that it knew were dogs. It was so certain that the investments were the financial equivalent of my used car that it bet against them — heads I win, tails you lose — and even selected the investments themselves, choosing from a cupboard of depleted and exhausted financial instruments. An investment in the Brooklyn Bridge would have been safer.