 ::I don't think they really conflict. Friedman, in that quotation, might give the impression that he is okay with whatever people in a given society want to do, but his exposition of his ideas elsewhere shows that he has a lot of pretty clear ideas about what that is or ought to be: he believes in property rights, the wrongness of murder, etc.; basically all that good stuff that Rothbard believes in. Rothbard does believe in a natural law, but, of course, he doesn't expect people to follow a natural law that they themselves don't believe in. So, as far as any society where anarcho-capitalism actually prevails, I think the Friedmanian vision and the Rothbardian are basically the same. ::In my experience some of the Rothbardian think there is a conflict between Rothbard and Friedman, but Friedman does not. -  