Scott Sumner is a fascinating phenomenon

From this:

In late 2008 the markets were telling us that the Fed was making a tragic mistake by allowing NGDP expectations to plunge.  But the economics profession didn’t listen, as they view stock investors as being irrational.  Economists were obsessed with the notion that the real problem was banking distress, and that fixing banking would fix the problem.  No, the real problem wasn’t banking, the real problem was nominal.

I don't understand the full argument yet, but he advances the position that it is possible to engage in "nominal" planning of the economy, in effect to declare through the control of a fiat currency that the economy would grow at a constant rate in nominal terms. In this way, he seems to claim, the more violent fluctuations of a capitalist economy can be avoided as capitalists and rentiers can, indeed have to, make plans based on a predictable path of the nominal size of the economy (and thus of their money-denominated assets).