> For example, companies that get a monopoly will rip you off, but only by so much.

Sounds like a rare victory of the good over its old nemesis, the perfect. I believe that a social environment that can pull this off will have a clear edge in many different ways, e.g. government can work so much better when it can be trusted that power abuse, if it happens, won't be excessive. Much better than pretend-saints who really aren't.