Let me try to explain what bothers me about this sort of thing, aside from the fact that it would be an utter disaster for the economy: it’s the way Rajan — and many other economists — seem to be making up new doctrines on the fly to justify their policy prejudices.
I’m all in favor of innovative thinking. But my view is that what you say about policy at any given time should be based on some kind of model — and furthermore, you should be willing to apply the same model to other situations, not make it a one-off used to justify what you happen to favor right now.