Inflation Report Hits Stocks: Worst Day Since July

The latest inflation report just rattled Wall Street, and your feed is about to feel it. U.S. stocks had their worst day since July on Wednesday after the government said prices rose three point seven percent in September compared with a year earlier, faster than economists expected.

According to the Associated Press, as published by the Los Angeles Times, the S&P 500 sank one point one percent, its fifth loss in six days since hitting an all-time high. The Nasdaq composite slid one point nine percent, and the Dow Jones Industrial Average slipped about one tenth of a percent.

What the inflation report actually said

The consumer price index climbed three point seven percent from a year ago, up from three point four percent in August, the Labor Department said Wednesday, according to the Associated Press. Economists had been braced for three point six percent. On a monthly basis, prices jumped six tenths of a percent, the biggest gain in five months.

Core prices, which strip out food and energy, rose two point six percent from last year. That is up from two point four percent in August and higher than forecasts. According to the Associated Press, the monthly core pace of three tenths of a percent would run well above the Fed's two percent target if it lasted a full year.

Bill Adams, chief U.S. economist at Fifth Third Bank, told clients the report was worse than expected. "Price increases were widespread," he wrote, "affecting a range of durable goods, nondurables, and services."

Gas, flights and gadgets lead the climb

Gas prices leapt nine point one percent from August to September, which the Associated Press ties to the lingering impact of the war with Iran. Fuel costs then spill into everything else. Airfares rose one point two percent in the month and have soared twenty-two percent over the past year, so that spring-break flight is getting pricey.

Not everything went the wrong way. Grocery prices actually slipped one tenth of a percent in September and are up just one point eight percent from a year ago. Ground beef fell eight tenths of a percent, though it is still up more than five percent over twelve months.

The AI boom is also leaving fingerprints on your wallet. The same Associated Press report says the data center buildout has pushed up prices for computer chips and the electronics built around them. Goldman Sachs estimated the buildout has added roughly half a percentage point to annual inflation. Nintendo raised the Switch 2 price by eleven percent to $499.99 on September first, and the iPhone 17 costs about ten percent more than its predecessor.

Why AI stocks took the hardest hit

This inflation report did not just sting shoppers. It sent bond yields higher, and the ten-year Treasury yield briefly jumped above five point three two percent from under five point one seven percent just before the release. It later gave back much of that move.

Higher yields make borrowing pricier, which matters a lot for AI companies that need huge piles of cash to build data centers and buy chips. According to the Los Angeles Times, Nvidia fell three point two percent, Broadcom dropped three point one percent and AMD tumbled five point seven percent. Cloud computing firm CoreWeave plunged fifteen point five percent for its worst day since February, and Oracle sank eight point eight percent.

Reuters reported the same pattern on Wednesday, describing a slump in debt-heavy AI infrastructure firms as bets on a U.S. rate hike rose. You can read more about how the boom is reshaping the industry in our tech coverage.

Banks stumbled too

Earnings season added to the pain, and the inflation report made it worse. Bank of America dropped four point eight percent after reporting weaker profit and revenue than analysts expected, and that was before the Treasury Department announced one point two billion dollars in fines over alleged anti-money laundering and sanctions violations. State Street fell four point one percent on weaker revenue.

What it means for rates and your money

Federal Reserve Chair Kevin Warsh said last month that inflation is not heading back to target quickly enough, which pushed the Fed to raise rates for the first time in three years, to about three point nine percent. The central bank meets October twenty-seventh and twenty-eighth. Traders now see a nearly thirty-five percent chance of another hike, up from twenty-two percent a day earlier, according to CME Group data cited by the Associated Press.

Vanguard senior economist Adam Schickling said inflation should slow as Americans get more price-sensitive and worker productivity improves, but that "patience will be required." Much of today's inflation comes from supply shocks such as disrupted oil and gas, and higher interest rates cannot fix those bottlenecks.

For younger people, the takeaway is practical. Savings accounts may keep paying more, but car loans, credit cards and gadget upgrades are not getting cheaper soon. This was also the last major inflation data before the midterm elections, and an Associated Press-NORC poll found only seventeen percent of U.S. adults approve of the president's handling of the cost of living.