You can't reduce greed. If a society has the will, they can starve it by denying elitism and class privilege. But it will just hibernate, awaiting circumstances favoring its return. And humans will always create/accept opportunities to satisfy their Jerry McGuire trait. We have a collective tendency of no matter how much we got, we always want more. Greed, you see, is the central column of capitalism. It refuses to be reduced. To get rid of it, you have to kill it. But the dastardly thing about greed is, it resurrects itself.