You do just have to go back to moral philosophy and you've got to say, okay, there is greed, people do want more and more, but then what restrains them and what restrained them in the past was a view of life in which one's satisfaction wasn't the most important thing, that you just, you needed enough and you could say, "Enough is enough." Maybe religion will get you there, maybe just classic moral philosophy, but you have to have some of that, or else you're always on the gravy train.