Comment by eru
> There are no markets without government intervention.
David Friedmann (and others) would like to object, I am sure. See eg http://daviddfriedman.com/Legal%20Systems/LegalSystemsConten... for how many legal systems work without (or despite!) government intervention.
Functional markets require a strong mechanism for protection of property rights. The fact that we have some historical systems where that has taken a different form than a conventional government doesn't negate that the only practical mechanism that we have to protect property rights and support markets is a government.
Ancap fantasies aside, of course.
And then, there's lots of situations where externalities exist. If I poop in the river and you're downstream, it costs me nothing; I have no reason to stop.