This is where the Keynesian ignorance of the long run demonstrated by Krugman leads you: lurching from one catastrophe to the next with a series of increasingly expensive quick fixes of ever shorter duration which do nothing to address the underlying problems.
The economic problems of Greece, Spain, and Britain are not that the deficits of 7 per cent, 7 per cent and 8 per cent their governments are respectively running are not high enough. Greek labour costs are higher than elsewhere and Greece doesn't export very much. Spain has unemployment of 24 per cent thanks to a labour market which makes job creation almost impossible. Britain is already one of the most indebted nations on the planet.
These fundamental problems are ignored by Krugman and his followers. In his 1994 book Peddling Prosperity Krugman accused the supply-side economists of the 1980s of being "cranks" selling "snake oil" because, he said, they offered politically expedient economic non-remedies with no basis in fact. Hypocrisy, thy name is Krugman.
As for that Nobel Prize, Paul Krugman won it for his work on international trade patterns, not his crackpot Keynesianism. Sir Paul McCartney won an Ivor Novello award for writing "Yesterday". That doesn't mean sentimental schlock like "Mull of Kintyre" is worth listening to.