When the Fed Chair is an Academic by Kash Mansori
The big economic news of the week was, in fact, big economic news: the Fed's announcement of significant changes from past practice in the the quantity of its next round of large scale asset purchases ("unlimited"), and in the timing of any future reversal of this expansionary policy ("a considerable time after the economic recovery strengthens").
I view this as a pretty fundamental shift in how the Fed hopes to affect the economy. Rather than trying to push economic activity one way or the other through its management of interest rates (which can alter economic activity through its portfolio-rebalancing and wealth effects, for example), the Fed is now quite explicitly trying to affect economic activity by altering interest rate and inflation expectations. As Krugman has put it, the crux of the matter here is that this is pretty close to a "credible promise to be irresponsible".
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