Those Radical VSPs:

although many of the press reports describe Syriza as “far-left”, it’s actually preaching fairly conventional economics, while the supposedly responsible officials of Brussels and Berlin have been relying on radical doctrines like expansionary austerity and a growth cliff at 90 percent. The same has to a certain extent been true in the US context. Once again: textbook macroeconomics says that focusing on deficit reduction in a depressed economy, where the zero lower bound constrains the effectiveness of monetary policy, is a very bad idea. And although nobody will believe it, textbook macro has actually been a very good guide to the economy since the financial crisis, as Jared Bernstein also emphasizes.

Krugman points out how current right of center economic theory isn’t based on conservative economic or on textbook mainstream economics. Its based on very radical and very untested ideas that aren’t working out.