08-23-2016, 05:09 PM
The "Block circles" device doesn't purport to be any kind of dispositive "test" like the Nolan chart. It's not nearly as "neat and tidy" as the Nolan chart pretends to be; nor was it designed as a recruiting or proselytizing tool, as the Nolan chart was.
It's just an informally illustrative device he's used in a few presentations I've seen over the years, as part of Block's answer to people who ask him whether folks like Milton Friedman are "really" libertarians or not.
Just off-hand, I can't find any of the videos in which he uses the device. I did find this brief clip (part of a longer interview) in which he identifies Hayek and Friedman as libertarians, though he doesn't go into the "circles" thing. (However, it should be noted that in other more formal and rigorous contexts, such as this paper, Block denies that Friedman is a "libertarian" and identifies him as a "classical liberal.")
I'm sure Walter would be the first to say that it would not. He has, for example, explicitly acknowledged Rothbard's disagreement with him on "evictionism." The whole abortion issue, in this context, revolves around whether and how the NAP should apply to the unborn vis-ŕ-vis mothers. Even those at the very "center" of Block's circles can disagree over the answers to such questions.