> But the financial system can: The bad thing that Wells Fargo did caused its stock to drop, which is a good rough measure of how bad it was. The shareholders perform the socially useful service of measuring the badness [...]
I think this is a really interesting point - assuming the actors in the market who are buying and selling stocks share the same general morals of the rest of the population, they can penalize companies that do bad things. But that would mean market forces would need to act on moral grounds and not on profit motives.