I don’t think Krugman is stupid because he disagrees with Austrian Economics – I think he’s stupid because he so obviously is, as revealed in this particular gem:
[w]hy doesn't the investment boom—which presumably requires a transfer of workers in the opposite direction—also generate mass unemployment?
Yup – that’s what he asks. Not rhetorically, but in all seriousness. You don’t believe it? Check it out here.
Krugman really went to pot.