Krugman is responding to accusations that he favors war as a solution to the Great Waste (sequelae to the Great Recession). He gives a smart response to dumb questions, but reading how major wars do Keynes better than politicians made me think about What Would the Market Do?
What do I mean? Well, consider this. Charlie Stross, one of my mind expanding writers included "
The story captured a sense I often have that the large, complex adaptive systems we live in are, seen from a certain angle in a certain world as real and unreal as our own, alive. Not smart like we are, but alive in a landscape dominated by very powerful amoebae.
In this worldslice Markets are entities with their own agenda -- mostly to eat and grow. Sometimes, though, the growing is slow. The Market has to find new food. It moves along a chemotropic gradient to a new source of nutrition.
 I updated this paragraph thanks to a helpful comment.