Coercion vs. Consent includes this passage from David Friedman:
While we cannot logically derive our values, we have them. So do other people. Fortunately, human values vary a good deal less than one might suppose from reading political philosophers. Few egalitarians would prefer a society where everyone had a real income of $1,000 to one where incomes ranged from $90,000 to $100,000. Few Rawlsians would choose to improve the lot of the world?s worst-off person by one dollar at the cost of massively reducing the welfare of everyone else in the world. And few libertarians, however hard-core in theory, would choose a perfectly free society of desperate poverty over one slightly less free and very much wealthier. Almost everyone, in my experience, values most of the same things, although not with identical weights. It is easy for both libertarians and socialists to claim to support their principles whatever the consequences — when each group believes the consequences would be, on very nearly all dimensions, the most attractive society the world has ever seen.If most people have at least roughly similar values, and if libertarians are correct about what sort of society libertarianism would produce, we need not justify our own values in order to argue for libertarianism. All we need do is to show that a libertarian society would be more attractive, by widely shared standards, than any alternative — wealthier, wiser, freer, more just, better for poor as well as rich. That is, after all, what most libertarians believe.