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It's really amazing to see how quickly the notion that contractionary fiscal policy is actually expansionary is spreading. As I noted yesterday, the Panglossian view has now become official doctrine at the ECB. So what does this view rest on? Partly on vague ideas about credibility and confidence; but largely on the supposed lessons of experience, of countries that saw economic expansion after major austerity programs. Yet if you look at these cases, every one turns out to involve key elements that make it useless as a precedent for our current situation.