This question started as a comical rant on my journal.
http://michaelduff.livejournal.com/395650.html
Here’s the crux of the issue:
The Rudebusch version of the rule is:
Target fed funds rate = 2.07 + 1.28 x inflation - 1.95 x excess unemployment
where inflation is measured by the four-quarter change in the core PCE deflator, and excess unemployment is the difference between the actual unemployment rate and the CBO estimate of the NAIRU, which is currently 4.8 percent. This rule describes past Fed policy quite well.
Applied to current data, the rule says that the Fed funds rate should be — drum roll — minus 5.6 percent. You can’t do that, of course, so we’re very hard up against the zero lower bound.
I’ll confess to being a novice here, but please guys, as the guardians of rationality and common sense in economic thought, tell me I’m not crazy.
Confirm that any formula that ends up recommending negative interest rates is nonsense and deserves to be treated like nonsense.