My main message today is that the FOMC can provide additional monetary stimulus by making this sentence more precise in the form of what I’m going to call a liftoff plan: a description of the economic conditions that would lead the Committee to contemplate the initial increase in the fed funds rate above its currently extraordinarily low level.
I will suggest the following specific contingency plan for liftoff:
As long as the FOMC satisfies its price stability mandate, it should keep the fed funds rate extraordinarily low until the unemployment rate has fallen below 5.5 percent.
The fed funds rate is a short-term interbank lending rate that is the FOMC’s usual vehicle for influencing credit conditions. I’ll be much more precise later about the meaning of the phrase “satisfies its price stability mandate.” Briefly, though, I mean that longer-term inflation expectations are stable and that the Committee’s medium-term outlook for the annual inflation rate is within a quarter of a percentage point of its target of 2 percent. The substance of this liftoff plan is that, as long as longer-term inflation expectations remain stable, the Committee will not raise the fed funds rate unless the medium-term outlook for the inflation rate exceeds a threshold value of 2 1/4 percent or the unemployment rate falls below a threshold value of 5.5 percent. Note that neither of these thresholds should be viewed as triggers—that is, once the relevant cutoffs are crossed, the Committee retains the option of either keeping the fed funds rate extraordinarily low or raising the fed funds rate.
This is a remarkable change of views. See his comments from earlier this year.