Via Peter Suderman, I find Tyler Cowen indulging his inner David Brooks with a brief taxonomy of libertarians:

1. Cato-influenced (for lack of a better word).  There is an orthodox reading of what “being libertarian” means, defined by the troika of free markets, non-interventionism, and civil liberties.  It is based on individual rights but does not insist on anarchism.  A ruling principle is that libertarians should not endorse state interventions.  I read Palmer’s book as belonging to this tradition, broadly speaking.

2. Rothbardian anarchism.  Free-market protection agencies will replace government-as-we-know-it.  War is evil and the problems of anarchy pale in comparison.  David Friedman offered a more utilitarian-sounding version of this approach, shorn of Misesian influence.

3. Mises Institute nationalism.  Gold standard, a priori reasoning, monetary apocalypse, and suspicious of immigration because maybe private landowners would not have let those people into their living rooms.

4. Jeff Friedman and Critical Review: Everything is up for grabs, let’s be consequentialists and focus on the welfare state because that’s where the action is.  Marx is dead.  The case for some version of libertarianism ultimately rests upon voter ignorance and, dare I say it, voter irrationality.

5. “Hayek libertarianism.”  All or most of the great libertarian thinkers are ultimately compatible with each other and we have a big tent of all sorts of classical liberal ideas.  Hayek and Friedman are the chosen “public faces” of this approach.  “There’s a classical liberal tradition and classical liberal values and we can be fuzzy on a lot of other things.”

This seems off to me—and uncharacteristically messy, actually. For one, it blurs together a bunch of different levels of taxonomy. Mises and Cato both have institutional cultures that are distinct from whatever ideological strains somone might associate with them—and in the case of Cato, at least, I think there’s substantial enough internal diversity that I’d be hesitant to use it as a tagline for any particular form of the philosophy. Which is as it should be at a policy shop.  I’m not disposed to sit around making elaborate lists all day, but if you wanted to do this, I think you’d want a set of cultural categories and a set of philosophical ones, though of course certain pairings are a lot more common than others. Tyler’s list is more of a philosophical breakdown, but it reads oddly. Jeff Friedman runs an interesting journal and some great seminars, but his name looks odd juxtaposed with “Rothbardian Anarchism” as a category. A more intuitive grouping would put him in with a much broader bunch of public choice–minded consequentialists, alongside those Rothbardian Anarchists, a generic group for “non-aggression principle” deontologists, Chicago Schoolers, paleolibertarians, Objectivists (who are libertarians in every ordinary-use sense of the term, even if they don’t like it), and ecumenical Hayekians. I leave the cultural subdivisions as an exercise for the reader. My comments regarding Jeffrey Friedman notwithstanding, Starchild is actually his own category here.