STUART TAYLOR says that Janice Brown is an extremist. David Bernstein, on the other hand, says that Taylor is wrong. Jim Lindgren, meanwhile, wonders whether the notion of teaching economics without scarcity is extremist.

That last question, at least, is answerable: It’s outside the mainstream now, but it won’t be in a post-nanotechnology age, though I rather doubt that’s what Frank Michelman had in mind.