Escape velocity and exit strategy

The Japanese Economy: Both Barrels? by Ryan Avent

I think I lean toward Mr Posen's view. Fiscal stimulus is neither necessary or sufficient for Japanese recovery, and though it could enhance a new monetary expansion it also carries some potentially serious risks. But I'm not that confident in the conclusion. Japan is a strange case. I suppose that makes the big upside of the situation (for economists, not the Japanese) the possibility that we'll learn something.

I disagree and agree with Krugman.