Not surprisingly, Krugman turns back to Keynes for inspiration:
The case for expansionary policies in the face of a slump is intellectually difficult; Keynes described the writing of the General Theory as a painful process of discovery, and so it is. The natural instinct of almost everyone is to think that tough times require tough measures, and that if the economy is suffering, the government should tighten its own belt. It would take a clear consensus from economists to overcome that natural bias.This is nuts. Keynes refuted NO errors 70 years ago. His so-called refutation of Say's Law was a joke. First, he created a straw man and then, second, refuted something no one believed.
And that consensus has, of course, been lacking — largely because a significant proportion of the economics profession has spent the last three decades systematically destroying the hard-won knowledge of macroeconomics. It’s truly a new Dark Age, in which famous professors are reinventing errors refuted 70 years ago, and calling them insights.
If anyone did any refutations, it was Henry Hazlitt in 1959 when he made mincemeat of The General Theory in his own book, The Failure of the New Economics. Hazlitt went through Keyne's "masterpiece" line by line, demonstrating how it was nothing but a tissue of fallacies.
There was no "hard-won" knowledge of macro, unless one believes that an economy is nothing but a bunch of aggregates, that prices are just numbers to go into an index, and that government creates wealth by printing money. Don't forget that this "hard-won" knowledge by 1980 was giving us double-digit inflation, high unemployment, and an economy in tatters.
So, Krugman wants us to believe that all we need is borrowing, spending, and lots of printing money. Oh, and costs are nothing but administrative numbers. This is not economics, folks, it is pure bureaucracy.