Its the Fed’s fault – Part II: The search for neutral
Every now and then we start to see new terms appear followed by the musing of learned observers. One is the concept of a neutral interest rate defined as that rate of interest at which there is no inflation and full employment. At that rate, Federal reserve policy itself is in neutral being neither expansive nor contractionary. Think of it as the economy’s equilibrium interest rate. The problem with the concept is that the neutral interest rate cannot be observed. There are some fancy formulations out there to estimate it but those are just estimates. Anyway, that interest rate is a moving target given the dynamics of the economy. Today’s neutral most likely won’t be tomorrow’s. If the Fed seriously tried to continuously manipulate monetary policy to find neutral it would be more destabilizing than it is currently – and that is plenty destabilizing all ready.
But let us suppose that the neutral rate could be accurately measured and predicted. The Fed actually makes sounds like they know what it is. Fed chair Powell has droned on about a neutral rate of around 3 percent, meaning that a Fed rate above 3 percent would be restrictive while a rate below 3 percent would be expansionary. This would mean that current Fed policy is restrictive and would have room for ease. Hence, the logic of lowering the Fed funds rate. The fragile labor market and inflation above the Fed’s target of 2 percent would present challenges for the Fed seeking to move from restrictive levels toward the lower neutral rate but it seems to be on that path.
One of the problems of course is that no one knows what is the actual neutral rate. Chairman Powell has said “There are a range of views of what the neutral rate is at this moment for our economy … It’s not so mechanical. We understand that no one actually knows what the neutral rate is. We know it by its works.” Those “works” are the way the economy reacts to changes in the Fed rate. This is reminiscent of what Justice Potter Stewart said about pornography in that he knows it when he sees it. In the case of the Fed, that’s one hell of a way to run an economy.
Supposedly the model most commonly used by the Fed is from the Federal Reserve Bank of New York, the Holston-Laubach-Williams model. You can find it at https://www.newyorkfed.org/medialibrary/media/research/staff_reports/sr1063.pdf?sc_lang=en&hash=E048A35AE227C58E9E5D635FCC9259EC
I am no longer in academics but monetarists would question the very foundations of this model which are Keynesian in nature within an IS-LM framework incorporating the Phillips curve showing an inverse relationship between inflation and unemployment. There is a significant body of work outside the Federal Reserve’s economists questioning not only Keynesian economics but also the IS-LM and Phillips curve formulations. My doctoral seminar was littered with lectures on the deficiencies of such models and their inaccurate predictions. I know the economists at the Fed know this since the former economics head of the Open Market Committee was one of the readers on my dissertation. But if the Fed is actually using these formulations then we need a new set of economists working there.
Consider that the model applies the “Kalman filter to translate movements in real GDP, inflation, and short-term interest rates into estimates of trend growth, the natural rate of output, and the natural rate of interest.” The problem inherent in all this is that there must be assumptions made regarding the nature of the shock processes that affect the movement of inflation and output. This is the problem with all such models as I have written with regard to climate models. These models are overly complex yet must be restrictive at the same time. The Fed’s model estimates a real neutral rate and then adds the current rate of inflation to yield the nominal neutral rate. The estimated real neutral rate in the fourth quarter of 2025 was 0.84%. The Fed’s inflation target is 2% meaning that the nominal neutral rate would be 2.84 percent. This would imply that even with the past three rate cuts, the Fed’s monetary policy is still too restrictive. So given the Fed’s own estimates, President Trump was right in arguing that the Fed should lower interest rates because its own models show that interest rates are too high being above their own estimation of the neutral rate.