Inflation expectations
What people think prices will do influences what prices actually do. This makes central banking partly a matter of persuasion.
A business setting next year's prices, and a worker negotiating next year's pay, both have to guess at inflation. Those guesses become the prices and wages that constitute inflation. The expectation is not merely a forecast of the outcome — it is an input to it.
Anchored and unanchored
Expectations are anchored when people assume inflation will return to target regardless of what it is doing right now. A supply shock then raises prices once and fades, because nobody reprices on the assumption it will continue. Unanchored expectations mean a shock changes what people expect, which changes what they do, which makes the shock persistent. The same initial disturbance produces completely different outcomes depending on which regime you are in.
This is why central banks respond forcefully to inflation caused by events they cannot influence — a war, a harvest failure, a supply chain rupture. They are not trying to increase the oil supply. They are trying to prevent the episode from changing what people expect.
How expectations are measured
- Household surveys — what ordinary people expect. Consistently higher than actual inflation, heavily influenced by the prices people see most often, especially fuel and groceries.
- Professional forecaster surveys — more accurate, and they move slowly and cluster around the target, which limits their information value.
- Market-implied breakevens — the gap between the yield on a conventional government bond and an inflation-linked one of the same maturity. Continuous, forward-looking, and contaminated by liquidity and risk premia.
- Inflation swaps — a direct market price for expected inflation over a horizon, used widely by policymakers.
Each is a proxy with a known bias. Surveys capture what people say, market measures capture what people will pay including a premium for bearing inflation risk, and forecaster surveys capture professional consensus. Central banks watch all of them precisely because no single one is trustworthy.
The five-year, five-year forward
A commonly cited measure is expected average inflation over the five years beginning five years from now. The logic: the near term is dominated by current conditions, while the distant horizon reflects belief about the regime itself. If that number holds steady through a period of high inflation, expectations are anchored and the shock is expected to pass.
Credibility as an asset
A central bank's ability to anchor expectations depends entirely on its record. Institutions that allowed inflation to persist in the past must prove themselves again, which typically means higher rates for longer to achieve the same effect. A reputation built over decades can be spent quickly, and rebuilding it is expensive in output and employment.
This is the strongest practical argument for central bank independence — not that unelected officials make better decisions, but that a body insulated from the electoral cycle can make commitments the public will believe. See how the Fed works.