Christina Romer on Learning from the Great Depression

What we learned from the Temin and Wigmore paper is that one way out of a recession at the zero lower bound is by changing expectations. To do that, often what is needed is a very strong change in policy – something economists call a “regime shift”. The most effective way to shake an economy out of a terrible downturn when we’re at the zero lower bound is an aggressive change in policy that makes people wake up, say “this is a new day” and change their expectations. What the Fed has done since early 2009 is much more of an incremental change.

I think that what the Fed needs instead is a regime shift. A number of economists have suggested that the Fed adopt a new framework for monetary policy, like targeting a path for nominal GDP. If the Fed adopted such a nominal GDP target, they would start in some normal year before the crisis and say nominal GDP should have grown at a steady rate since then. Compared with that baseline, nominal GDP is dramatically lower today. Pledging to get back to the pre-crisis path for nominal GDP would commit the Fed to much more aggressive policy – perhaps more quantitative easing and deliberate actions to talk down the dollar. Such a strong change in the policy framework could have a dramatic effect on expectations, and hence on the behavior of consumers and businesses.

(via Thoma)