Inflation Persistence
The tendency of inflation to stay elevated long after the original shock — because prices and wages reinforce each other.
In plain words
A supply shock — an oil price spike, a pandemic disruption — should, in theory, raise prices once and stop. The year-on-year inflation rate would spike temporarily, then fall back as the comparison base adjusts. That would be transitory inflation. But sometimes inflation stays elevated far longer than the original shock justifies. That is inflation persistence.
The 2021–26 episode was a vivid illustration. The initial shocks — supply chain disruptions in 2021, the commodity price spike after Russia's invasion of Ukraine in 2022 — were supply-side and arguably temporary. But inflation proved remarkably persistent. Core inflation in the US, UK, and euro area remained above 3–4% through 2025–26, long after goods prices had normalised. The culprit: services inflation, which stayed elevated because wages had risen to compensate for the cost-of-living crisis, and service-sector firms passed those wage costs into prices. Even in October 2026, with UK headline CPI at 3.0% and goods in deflation, services CPI stood at 5.6%.
Track how persistence is playing out today across countries on our inflation explorer.
Three mechanisms that create persistence
Wage-price feedback
Workers who experienced a real income squeeze demand higher nominal wages in subsequent pay rounds. Service-sector businesses — where labour is the primary input — pass those wage costs into prices. This is a moderate version of the wage-price spiral: not a runaway loop, but a persistent feedback that keeps services inflation above target even after goods prices normalise. In the UK, this mechanism kept services CPI above 5% for 18+ months after goods deflation set in.
Unanchored inflation expectations
If households and businesses expect inflation to stay high, they set wages and prices accordingly — making the expectation self-fulfilling. Anchored expectations are the primary bulwark against persistence: when workers trust the central bank will return inflation to 2%, they accept moderate wage rises and the spiral is avoided. When credibility is questioned (as it briefly was in 2021–22 when major central banks were slow to hike), expectations can drift, amplifying persistence.
Backward-looking indexation
In some sectors, prices and wages are set by formula based on past inflation — UK rent contracts indexed to RPI, regulated utility prices adjusted annually by CPI, public-sector wage settlements tied to previous-year inflation. This backward-looking indexation mechanically carries past inflation forward into future prices and wages, even after the original shock has fully dissipated. It is the most mechanical source of persistence and the hardest for monetary policy to address quickly.
How persistence is measured
Autocorrelation: How strongly does this month's inflation predict next month's? High autocorrelation (close to 1.0) means persistence is high — knowing today's rate gives a good forecast of tomorrow's. The IMF documented a meaningful increase in inflation autocorrelation after 2021, particularly for services components, compared to the low-persistence 2010s era.
Half-life: How many months does it take for an inflation shock to fade by half? Services inflation has a much longer half-life (~12–18 months) than goods inflation (~3–6 months), explaining the asymmetric disinflation pattern of 2023–26: goods deflation was rapid, services disinflation was slow.
Core CPI serves as the practical proxy for persistent inflation — it strips out the volatile food and energy components that generate temporary shocks. Persistent core above target is what forces central banks to maintain monetary tightening even after headline falls below target. The ECB's challenge as of late 2026 — with headline HICP at 1.7% but core at 2.7% — illustrates this perfectly: the headline looks fine, but the persistence signals are not.
Frequently asked questions
How do central banks distinguish a persistent inflation shock from a temporary one?
They look at core inflation (ex-food and energy), services inflation, and wage growth. If a spike appears in headline but not core, it is likely temporary (an energy price shock). If core inflation rises and services inflation rises alongside wage growth, the shock is becoming persistent. Central banks also use survey measures of inflation expectations: if households and businesses start expecting inflation to remain above target for 2–3 years, that itself is evidence of persistence risk. The Fed, ECB, and BoE all explicitly cite these measures in their policy communications.
Is services inflation more persistent than goods inflation?
Yes, substantially. Goods prices respond quickly to global commodity prices, shipping costs, and supply chain conditions — they fell sharply in 2023–24 as supply chains normalised. Services prices are driven primarily by labour costs (wages), which adjust slowly and are protected by collective bargaining, minimum wage legislation, and long-term contracts. The empirical half-life of goods inflation shocks is typically 3–6 months; for services inflation it is 12–18 months. This asymmetry is why the 2023–26 disinflation was fast for goods (deflation in some categories by 2024) and slow for services (still above 4% in the US and UK as of late 2026).
What is the difference between inflation persistence and sticky prices?
Sticky prices is a microeconomic concept describing the observation that individual firms do not change their prices continuously — they change them infrequently (quarterly, annually, or following a cost shock). Firms that change prices infrequently have "stickier" prices. Inflation persistence is the macroeconomic aggregate outcome: even if many individual prices are sticky, if enough of them are simultaneously rising (because of a common shock or wage dynamics), aggregate inflation can remain persistently elevated. Persistence is the result of many sticky prices all moving in the same direction at once, compounded by wage-price feedbacks and expectations dynamics. Sticky prices are one cause of persistence, but not the only one.