Inflation surged in September as U.S. energy costs jumped

A 3.7% annual increase means the Consumer Price Index was 3.7% higher in September than in September a year earlier. The CPI measures price changes for a basket of commonly purchased goods and services. It is a broad gauge of inflation, so it helps show how quickly living costs are rising.

This does not mean every item became exactly 3.7% more expensive. Some prices rose much faster, while others rose more slowly or fell. Gasoline, for example, increased 34.2% from a year earlier. Airline fares rose 22.4%, and energy prices climbed 20.4%.

The September result mattered because economists had expected 3.6%, and inflation had held at 3.4% for the previous two months. The hotter reading kept inflation well above the Federal Reserve's 2% target. It also increased pressure for another interest-rate increase later in the year.

Energy prices recorded the largest broad increase highlighted in the report. They rose 20.4% from a year earlier. Gasoline was even more dramatic, jumping 34.2% over the same period. That made fuel one of the clearest sources of higher household and business costs.

Gasoline also rose 9.1% from August to September. Airline fares increased 22.4% over the year. Shelter and used-car prices also pushed the core inflation measure higher, showing that increases were not limited to fuel. The national gasoline average reached $4.33 per gallon, compared with $2.98 before the war started.

These figures show both the scale and the spread of inflation. Energy was the biggest force behind the monthly CPI increase, but other categories were rising too. Diesel reached $6.29 per gallon, adding transportation costs that can feed into prices for groceries and other everyday goods.

Gasoline accounted for more than half of the monthly CPI increase because its price jumped sharply in September and gasoline is a major consumer expense tracked by the index. The Labor Department reported a 9.1% monthly increase. A large change in an important spending category can move the overall CPI substantially.

The effect is visible at the pump. The national average reached $4.33 per gallon on Wednesday, compared with $2.98 before the war started. Drivers paid more for fuel immediately. Businesses also faced higher fuel bills when vehicles, trucks, and other equipment required gasoline.

That combination explains gasoline's outsized contribution. It directly raises transportation costs for households and companies. It can also lift prices indirectly when businesses pass higher operating costs to customers. The report therefore showed energy driving the monthly result, even as shelter, used cars, and other categories raised core inflation.

Core inflation is the CPI measure that excludes the more volatile energy and gas categories. Economists watch it because it can reveal whether price pressures are continuing across the wider economy, rather than being caused mainly by temporary fuel swings. In September, core CPI rose 2.6% from a year earlier.

That was faster than August's 2.4% rate and above economists' 2.5% forecast. Shelter and used-car costs helped push the measure higher. These increases mattered because they came from categories outside energy, showing that consumers faced rising prices in several parts of their budgets.

The result suggested inflation was spreading and becoming sticky. Energy still played a huge role in the overall report, but core prices were also accelerating. That broader pressure made the report more concerning for the Federal Reserve, whose annual inflation target is 2%. It strengthened expectations that officials could raise interest rates again.

Gasoline and diesel are essential inputs for moving people, food, materials, and finished products. When fuel prices rise, trucking companies and other carriers pay more to operate their vehicles. The article specifically notes that higher diesel prices increase the cost of transporting goods around the United States.

For example, a truck carrying groceries may need more money to complete the same delivery route. The carrier may raise its charge to the supplier. The supplier and retailer then face higher costs for getting products onto store shelves. Businesses can respond by passing some of those costs to consumers through higher prices.

This process helps explain why energy inflation can spread beyond fuel stations. Diesel reached a record high in late September and averaged $6.29 per gallon. The article says those costs often lead to higher prices for everyday items such as groceries. Fuel therefore affects both transportation expenses and final selling prices.

The Federal Reserve uses interest rates as a tool to influence inflation. Its annual inflation target is 2%, but September CPI rose 3.7%, while core CPI accelerated to 2.6%. The report therefore showed that price growth remained above the central bank's goal and was not limited to volatile energy categories.

Higher interest rates generally make borrowing more expensive. That can reduce demand for credit, large purchases, and business expansion. Slower demand can make it harder for companies to keep raising prices. The article says the September reading could put pressure on the Fed to raise its benchmark rate later in the month.

The Fed had already raised rates in September to between 3.75% and 4% and signaled another increase later in the year. After the report, markets shifted to a 50% chance of another hike that month, up from 20%. Two policy meetings remained, on October 27-28 and December 8-9.

Interest rates affect the economy by changing the cost of borrowing money. When rates rise, households may delay purchases financed with loans, while businesses may reconsider expansion or investment. Saving can also become more attractive. Together, these changes can reduce total spending, which is one way higher rates help slow inflation.

The mechanism works through demand. If consumers and companies buy less aggressively, businesses may find it harder to keep raising prices. Companies may also reduce hiring or postpone projects when financing costs increase. That can slow employment growth and broader economic activity, although the article does not quantify those effects.

The Federal Reserve raised its federal funds rate to between 3.75% and 4% in September because inflation remained above its 2% target. Officials signaled another increase later in the year. The September CPI report increased pressure for that move, as both overall and core inflation accelerated.