At this point the economic case for austerity - for slashing government spending even in the face of a weak economy - has collapsed. Claims that spending cuts would actually boost employment by promoting confidence have fallen apart. Claims that there is some kind of red line of debt that countries dare not cross have turned out to rest on fuzzy and to some extent just plain erroneous math. Predictions of fiscal crisis keep not coming true; predictions of disaster from harsh austerity policies have proved all too accurate.

Yet calls for a reversal of the destructive turn toward austerity are still having a hard time getting through. Partly that reflects vested interests, for austerity policies serve the interests of wealthy creditors; partly it reflects the unwillingness of influential people to admit being wrong. But there is, I believe, a further obstacle to change: widespread, deep-seated cynicism about the ability of democratic governments, once engaged in stimulus, to change course in the future.

So now seems like a good time to point out that this cynicism, which sounds realistic and worldly-wise, is actually sheer fantasy. Ending stimulus has never been a problem - in fact, the historical record shows that it almost […]