Neutral rate

Imagine a thermostat for the economy. The neutral rate is the temperature at which the heating neither warms nor cools — it just maintains equilibrium. Set the policy rate above neutral (like turning up the heating on a warm day) and you cool the economy: credit becomes more expensive, investment slows, unemployment eventually rises, inflation falls. Set it below neutral (heating when it's already warm) and you stimulate: cheap credit, more borrowing, more spending, higher inflation. The problem: no one knows exactly where the thermostat's "neutral" setting is. It can only be estimated from economic data and models like the New York Fed's Laubach-Williams r-star model.

The neutral rate is not a physical constant — it shifts with the economy's structure. In an economy with high savings and weak investment (like the post-2008 world), r* is low. In an economy with strong investment demand (infrastructure, energy transition, defence spending), r* rises. After the COVID-19 pandemic, massive fiscal stimulus, supply chain restructuring, and the energy transition may have pushed r* higher — meaning central banks may need to keep rates higher for longer to be "neutral" than pre-2020 estimates suggested. The IMF's October 2026 WEO dedicates a chapter to the question of whether r* has structurally risen. The BIS Annual Economic Report reaches similar conclusions.

The neutral rate is the anchor for all central bank policy discussions. When the Fed or ECB debates "how restrictive is our current policy?", they are implicitly comparing the current policy rate to their estimate of r*. If r* has risen from 0.5% to 1.5% (real), a 5% nominal policy rate is 3.5% above neutral — very restrictive. If r* stayed at 0.5%, the same 5% rate is 4.5% above neutral — even more restrictive. Getting r* wrong in either direction leads to either over-tightening (unnecessary recession) or under-tightening (persistent inflation). This uncertainty is one reason central banks have moved toward "data-dependent" policy — they can't rely on a fixed r* estimate. Our real interest rate guide shows how to compute and track real rates across countries.

The neutral rate is frequently confused with the policy rate. The policy rate is observable — it's what the central bank announces at each meeting. The neutral rate is theoretical — it can only be inferred from models with wide uncertainty bands. The NY Fed r-star estimates come with 70% confidence intervals of ±2 percentage points. "The Fed has reached neutral" is therefore always a probabilistic statement, not a fact. Treating r* as known with precision leads to overconfident monetary policy and is a documented source of policy errors according to the BIS Annual Report.