The latest U.S. inflation report shows a mixed picture: headline consumer prices rose 0.4% in August, matching expectations, but the core measure came in hotter than anticipated. The core CPI, which strips out volatile food and energy costs, increased 0.3% month-over-month, above the 0.2% economists had projected. This firmer core reading is likely to reinforce the case for a Federal Reserve rate hike when policymakers conclude their meeting next Wednesday.
On an annual basis, headline CPI was up 3.4% from a year ago, in line with forecasts. Core inflation eased to 2.4% year-over-year from 2.5% in July, also matching expectations. However, the monthly acceleration in core prices is what caught the market's attention, as it suggests underlying price pressures are not cooling as quickly as hoped.
Energy prices drive headline gain
Energy costs were the primary driver of the monthly increase, with gasoline prices jumping 3.9% in August. That surge accounted for more than one-third of the overall rise in consumer prices. The broader energy index climbed 2.1% for the month and is now up 16.3% from a year earlier. Food prices, by contrast, rose just 0.1% in August, with groceries flat during the month.
The combination of persistent core inflation and a renewed energy shock has complicated the Fed's policy calculus. The central bank is set to receive no further major inflation data before its decision, making this report the final input for the upcoming meeting.
Market reaction and rate hike expectations
Stock futures moved higher following the release, with S&P 500 futures up 0.5% and Nasdaq futures gaining 0.7%. That positive reaction came even as traders increased their bets on a rate hike. According to the CME Group's FedWatch tool, the probability of a quarter-percentage-point increase now stands above 73%, up from earlier in the week.
The inflation data follows a robust August employment report that had already boosted expectations for tighter policy. Those expectations had been tempered by Fed Governor Christopher Waller, who recently said he would be inclined to keep rates steady if incoming data confirmed cooling inflation. The latest CPI reading makes that argument more difficult, particularly with core prices accelerating on a monthly basis.
Energy prices are also becoming a growing risk. The conflict involving Iran has pushed Brent crude above $100 a barrel, raising concerns that higher fuel costs could ripple through the broader economy. The European Central Bank raised its key interest rates on Thursday in response to similar inflationary pressures from the war and energy costs.
Economist calls for rate hikes
Joseph Brusuelas, principal and chief economist at RSM US, said the combined August producer and consumer price reports demand action from the Fed. "Given that oil and distillate prices have meaningfully accelerated into September and are likely to be passed downstream to consumers, the combined August Producer Price, and Consumer Price Indices demand action out of the Federal Reserve at its next meeting," he said.
Brusuelas argued that several forces are now reinforcing inflationary pressures, including the war-induced energy shock, tariffs, and the draw on commodities and finished goods for artificial intelligence infrastructure. He said it was time for the Fed to "rip up the textbook on looking through a wartime caused supply shock," as these supply shocks have persisted long enough to be considered non-temporary.
He pointed to rising gasoline, diesel, and jet fuel prices, which are increasingly feeding into groceries and transportation costs across the service-based U.S. economy. Brusuelas recommends the Fed reverse the three rate cuts implemented in late 2025 and slow an economy he expects to grow well above trend in the current quarter. He cited nominal GDP growth above 6% in the second quarter, a deficit-to-GDP ratio above 6%, near-full employment, and record corporate profits.
"The Fed needs to remove the three rate cuts that they implemented in late 2025 and slow an economy that is likely to grow well above trend in the current quarter," he said. By slowing demand, the Fed could shift some inflationary pressure from households to corporate balance sheets through lower profit margins.
Still, Brusuelas acknowledged the decision is finely balanced. "Granted that all of this is a difficult judgement-based call and is truly a coin flip at this juncture," he said. But he warned that after the August PPI and CPI reports, and with the prospect of a less disinflation-friendly PCE reading ahead, keeping rates unchanged could create a credibility problem for the central bank.
For investors, the key takeaway is that the Fed's path remains uncertain, but the odds are tilting toward a hike. The market's positive reaction to the data suggests that some traders see a hike as a sign of confidence in the economy, while others worry about the impact on growth. As always, the Fed's decision will be closely watched for signals about future policy moves.
This article is for informational purposes only and does not constitute financial advice.
