U.S. inflation accelerated to 3.7% in September as gasoline prices jumped 9.1% in a single month, but the more important surprise for markets came underneath the headline: core inflation rose 0.3%, above the 0.2% economists had expected.The Consumer Price Index increased 0.6% month over month on a seasonally adjusted basis, matching the broad consensus, and rose 3.7% from a year earlier, up from 3.4% in August. Forecasts had generally centered on 3.6% to 3.7% for the annual headline rate.Core CPI, which excludes food and energy, rose 0.3% from August and 2.6% from a year earlier. Both were above consensus forecasts of 0.2% and 2.5%, respectively.That makes the core figures the part of Wednesday’s report markets are likely to keep trading. The headline acceleration was heavily telegraphed by the surge in fuel prices. A stronger core reading suggests inflation pressure is extending beyond the direct energy shock.
Gasoline Rose 34.2% From a Year Ago
Energy was responsible for much of the headline move.The Bureau of Labor Statistics said the energy index rose 5.2% in September after increasing 2.1% in August. Energy prices were 20.4% higher than a year earlier.Gasoline alone increased 9.1% month over month and 34.2% year over year. The BLS said gasoline accounted for more than half of the monthly increase in the all-items CPI.Fuel oil was even more extreme, rising 15.3% in September and 74.2% over 12 months.That energy pass-through matters because investors already knew September would contain a large fuel component. The question before the release was whether underlying inflation would remain contained once food and energy were stripped out.It did not come in as softly as expected.Shelter rose 0.4% in September and 3.2% from a year earlier. The BLS also reported monthly increases in recreation, used cars and trucks, education, airline fares, medical care and apparel.
Core CPI Is the Number That Changed the Fed Debate
Before the release, economists generally expected core CPI to increase 0.2% month over month and 2.5% annually. The actual readings of 0.3% and 2.6% therefore represent an upside miss on both measures.That matters because the Federal Reserve has already restarted its hiking cycle.On September 16, the Fed raised its target range by 25 basis points to 3.75%-4.00%, its first rate increase since July 2023. The September CPI report is also the final CPI print before the October 27-28 FOMC meeting.Markets responded by sharply repricing the probability of another move this month. At around 2:05 p.m. ET Wednesday, CME FedWatch showed roughly a 42% probability of a 25-basis-point hike in October, up from about 22% before the CPI release. Earlier post-data readings reached as high as 47.1% as fed-funds futures adjusted to the inflation surprise.The distinction between headline and core therefore matters. A 0.6% headline increase driven largely by gasoline was already broadly expected. A 0.3% core reading was not.The latter gives policymakers more reason to ask whether higher energy costs, tariffs and other supply pressures are beginning to spread into prices that tend to be more persistent.
Gold Falls Below $4,100 as the 2-Year Yield Rises
Rates and precious metals moved quickly after the release.The U.S. 2-year Treasury yield, which is particularly sensitive to changes in expectations for Fed policy, was around 4.87% in Reuters’ latest U.S. market read, up 7.2 basis points on the day.Gold moved in the opposite direction. Spot gold was down 1.8% at $4,083.94 an ounce at 2:05 p.m. ET, its lowest level since October 7, as the dollar and Treasury yields rose.That is a significant reversal from the setup before the report. Earlier Wednesday, FinanceFeeds had gold near $4,155 ahead of CPI, with $4,000 as the downside reference if core inflation came in at 0.3% or higher. The actual print landed precisely on that hot-core scenario.Oil remains a complicating factor for the Fed because it is simultaneously lifting headline inflation and threatening further pass-through into other prices. FinanceFeeds’ CPI-day Brent analysis had crude near $106 a barrel before the release, with geopolitical disruption around Saudi Arabia and the Strait of Hormuz keeping the energy risk premium elevated.
Bitcoin Falls Toward $81,800 After the CPI Release
Bitcoin also weakened as rate expectations moved higher.The cryptocurrency had traded above $84,000 earlier Wednesday but was around $81,800-$81,900 in early-afternoon U.S. trading, down roughly 1.6% on the session.The immediate post-CPI move had already pushed Bitcoin below $83,000. FinanceFeeds tracked Bitcoin at $82,651 shortly after the release, when the inflation surprise first revived October rate-hike bets.The subsequent move lower fits the broader rates reaction rather than requiring a crypto-specific explanation: Treasury yields rose, the dollar strengthened and investors priced a greater probability that U.S. monetary policy will become tighter again.
The Fed Now Has a Harder October Decision
The CPI report does not make an October rate increase certain.Fed Vice Chair for Supervision Michelle Bowman said Wednesday that policymakers have time to “wait and see” how markets and the economy respond to September’s hike before deciding whether further action is necessary.But Wednesday’s data changed the starting point for that debate.Headline inflation at 3.7% can still be explained partly by an unusually large energy shock. The harder number for policymakers to dismiss is core CPI at 0.3% for the month and 2.6% for the year, both above forecasts.With no another CPI report arriving before the October decision, this is the inflation snapshot the Fed will carry into the meeting. The gasoline surge explains why inflation accelerated. The core miss explains why markets can no longer treat the late-October meeting as an easy hold.
