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The Neutral Rate: The Interest Rate That Neither Heats Nor Cools

Central banks speak often of the neutral rate, sometimes called r-star. It is the interest rate at which monetary policy neither stimulates nor restrains the economy, when inflation is at target and the economy is at full employment.

It cannot be observed directly. Economists estimate it using models based on growth, demographics, productivity, and savings behavior, and the estimates vary widely and change over time. Over the past few decades, many estimated that the neutral real rate fell, due to aging populations and weak productivity growth, and some recent analysis suggests it may have risen.

Why does it matter for currencies? The relationship between the actual policy rate and the neutral rate indicates whether policy is tight or loose. A rate above neutral is restrictive, tending to slow the economy and reduce inflation. A rate below neutral is accommodative.

When officials say they are close to neutral, the market infers that the pace of changes will slow. When they say rates are still well below neutral, more hikes are likely.

Statements from central bank officials about their estimates of the neutral rate can move markets, as seen when the Fed chair has commented on it.

Because the number is uncertain, officials often stress that they do not know where it lies, and that they will adjust based on incoming data.

Practical step: find your central bank's latest projection of the longer-run rate, and compare it with the current policy rate.

The Fed's dot plot includes a longer run rate projection, which is basically the committee's guess at neutral. Comparing it with the current rate is a two minute check on whether policy is tight or loose. The dots are published four times a year with the economic projections, at the March, June, September and December meetings. Watch how the median longer run dot changes from one release to the next. If it creeps higher over several meetings, the committee is quietly saying rates won't fall as far as people hoped, which tends to support the dollar. It's a slow signal, but one that shapes the bigger picture for months.

Because nobody knows the real number, watch the language more than the estimate. Approaching neutral from a chair usually means the pace of hikes or cuts is about to slow. When officials start saying policy is restrictive, they're hinting that the next moves may be cuts once inflation cooperates. Those phrases often appear in speeches before they appear in decisions, so they give early warning. I keep a short note of key phrases from each central bank's last few statements and press conferences. When a phrase changes, it's often more informative than the data release that week, and the currency can react to it within minutes.

Fairman wrote: When officials say they are close to neutral, the market infers that the pace of changes will slow.

For short-term trading the most practical place to see this is the Fed's dot plot, published with the projections four times a year. The "longer run" dot is effectively the committee's neutral estimate, and a shift in its median of even a quarter point can move the dollar more than the rate decision itself, because it changes where the market thinks the cycle ends.

That's also why the reaction to those meetings often comes in two waves: the statement and projections at 19:00 London time, then the press conference half an hour later where the chair gets asked about them. I'd look at the longer-run median first and compare it with the previous set before deciding which way the release actually leaned.