US rates are at 0%, the Fed is doing QE. QE is boosting the money suppply (both the monetary base as well as M2)
Nominal GDP = M2 * Velocity
While the Fed can't control velocity (although they can have some impact on it through their speeches) they have proved that they can control M2.
So the Fed can boost nominal GDP and prices through this mechanism. How is that pushing on a string? This is the very thing the Fed failed to do in the 1930's as Real GDP and prices collapsed (so Nominal GDP collapsed and people couldn't service their debts, causing further problems)
Nominal GDP = M2 * Velocity
While the Fed can't control velocity (although they can have some impact on it through their speeches) they have proved that they can control M2.
So the Fed can boost nominal GDP and prices through this mechanism. How is that pushing on a string? This is the very thing the Fed failed to do in the 1930's as Real GDP and prices collapsed (so Nominal GDP collapsed and people couldn't service their debts, causing further problems)