The price of gasoline can change on your drive home, while a car insurance premium usually changes about once a year. That gap is the starting point for understanding sticky inflation, the slow-moving part of rising prices that keeps going long after a fuel spike has passed. In September, the Atlanta Fed’s flexible-price index was up 6.1% over the year, while its sticky-price index was up 2.8%. The flexible number grabs the headlines, and the sticky one is what central banks watch, because once it climbs, it tends to stay up for a long time.
Quick answer: Inflation becomes sticky when price rises spread into parts of the economy that change slowly, mainly services, wages and rents. These prices are set by contracts, leases and annual reviews, and they take months or years to adjust. Energy shocks and rising inflation expectations can push them higher and keep inflation elevated even after some prices start falling.
Track the Data Behind Slow-Moving Prices
CPI, wage figures and central bank decisions all sit on the economic calendar with their expected impact, so you can follow the trend as each release lands.
Sticky vs Flexible Prices
The Federal Reserve Bank of Atlanta splits the consumer price index into two groups based on how often each price changes, a method set out in its sticky-price CPI explainer.
| Flexible prices | Sticky prices | |
|---|---|---|
| How often they change | Often, sometimes daily | Rarely, sometimes once a year or less |
| Examples | Gasoline, fresh food, airfares | Insurance, rent, medical care, haircuts |
| 12-month change, September 2026 | +6.1% | +2.8% |
| What they tell you | What’s happening right now | Where inflation is likely to settle |
Because sticky prices are reset infrequently, the people setting them build in what they expect inflation to be over the months ahead. That’s why a rise in the sticky index is often read as a sign that higher inflation is becoming part of the furniture.
What Makes Inflation Sticky
Services
Services make up about 60% of the US consumer basket, and prices for services excluding energy rose 3.1% over the year to September. Most of what you pay for a service goes on labor, and labor costs don’t fall when oil does. A dentist, a mechanic or a hairdresser who raises prices to cover higher wages is unlikely to cut them again a few months later.
Wages
Pay is usually reviewed once a year, often based on what inflation did over the previous year. US average hourly earnings rose 3.0% over the year to September, while prices rose 3.7%, leaving real wages down 0.7%. When workers fall behind, pressure builds for bigger raises in the next round, and those raises then feed back into the price of services.
Rents
Most leases run for a year, and the CPI’s main housing measure, owners’ equivalent rent, is based on surveys of existing rents. Both move slowly. Shelter rose 3.2% over the year to September and makes up more than a third of the basket. Even a small, persistent rise here keeps the headline elevated.
Energy Shocks That Spread
A fuel spike starts out as flexible inflation, and some of it seeps into sticky prices over time. Research from the Federal Reserve Board on advanced economies found that a lasting 10% rise in oil prices adds almost 0.4 percentage points to headline inflation, with the knock-on effects on food and core prices building slowly over about two years. Our article on oil prices and inflation follows that process step by step.
Inflation Expectations
If households and businesses expect prices to keep rising, they act on it. Workers ask for more, and companies raise prices sooner. The University of Michigan’s measure of year-ahead inflation expectations reached 4.6% in September, well above the inflation rate at the time, which is the kind of reading central banks pay close attention to.
Why Inflation Can Stay High Even When Some Prices Fall
Some prices fell over the year to September. Car insurance dropped 5% and used cars slipped 1.5%. Headline inflation still rose to 3.7%, because the falls were small parts of the basket, while energy and services kept climbing. Our guide to how inflation works breaks down how each part adds to the total.
Economists sometimes call the final stretch of bringing inflation down the last mile. The Bank for International Settlements has shown how services and other slow-moving prices held up long after goods inflation eased in the years after the pandemic, and the same pattern can repeat when an energy shock hits an economy where wages are already rising.
How Central Banks Respond
Central banks can’t do much about the price of oil, but they can try to slow the spending that lets businesses keep raising prices. Higher interest rates make borrowing more expensive and cool demand, which over time eases pressure on wages and services.
- The Fed: raised rates in September for the first time since 2023, citing inflation that remains elevated
- The ECB: raised rates in September and expects inflation to stay well above 2% for an extended period
The concern is that rates may need to stay high for longer to bring it down, which tends to keep bond yields elevated. Our article on bond yields and stocks explains what that means for share prices.
What Sticky Inflation Means for Markets
- Interest rate expectations: a rising sticky-price or services number tends to push expected rate cuts further away, or bring rate rises closer
- Currencies: a central bank seen as staying tighter for longer often supports its currency, and the forex page covers how rate expectations move currency pairs
- Stocks: companies with strong pricing power can pass on higher costs, while labor-heavy businesses with thin margins tend to feel the squeeze
Frequently Asked Questions
What is sticky inflation?
Sticky inflation is inflation that stays high because it comes from prices that change slowly, like rents, wages, insurance and other services. These prices are often set by contracts or annual reviews, so they take months or years to adjust. Once they start rising, they tend to keep inflation elevated even after energy and goods prices cool.
What is the sticky-price CPI?
The sticky-price CPI is a measure published by the Federal Reserve Bank of Atlanta that tracks items in the consumer price index whose prices change infrequently, like rent, insurance and medical care. It rose 2.8% over the year to September 2026, compared with 6.1% for flexible prices like gasoline and airfares.
Why is services inflation sticky?
Services inflation is sticky because most of the cost of a service is labor, and wages usually change only once a year. When pay rises, businesses like restaurants, clinics and repair shops raise prices to cover it, and they rarely cut them again. Services also make up about 60% of the US consumer basket.
How long does sticky inflation last?
Sticky inflation can last for a year or more, because the prices behind it are reset slowly through new leases, wage rounds and annual price reviews. Federal Reserve research suggests the knock-on effects of an oil price rise on core inflation can build over about two years, which is why central banks act early.
