A last piece on fiscal stimulus, as we all decide whether it was the great savior of the recession, or an ineffective idea ready to go on the ash-heap of bad ideas. Guess what I think. I explain the Barro theorem, how it constrains the debate even if it isn't literally true (how it's false matters a lot), and I respond to Krugman and Delong's latest outrages, in particular the claim that stimulus opponents have no model.

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