The Institute for Supply Management's services sector report for September, released Saturday, showed prices paid by service businesses surging to 74.0, up from 72.6 in August and well above the consensus forecast of 72.9. The upside miss signals that services inflation is not cooling but accelerating, raising questions about whether the Federal Reserve's September rate hike to 3.75-4.00 percent will be sufficient to tame price pressures.

The overall ISM Services PMI came in at 54.9 in September, slightly below the consensus expectation of 55.0 and down from August's 55.4. While the composite reading continues to indicate expansion in the services sector, which accounts for roughly 70 percent of U.S. economic output, the headline number understates the underlying inflation problem.

Prices Paid Index Jumps Above 70

The prices paid index has now run above 72 for two consecutive months. At this level, services inflation is not moderating despite the Fed's rate increase. The services sector, which includes restaurants, healthcare, financial services, and hospitality businesses, is where cost pressures typically translate most directly to consumer prices.

Business activity dropped 5.2 points to 56.5, well below the consensus of 61.5. New orders slipped only 1.1 points to 59.8, against a consensus of 60.3. The gap between a still-robust forward-demand signal and a sharply lower output reading reflects tension in the sector as businesses struggle with elevated input costs.

Employment Picture Improves Modestly

Services employment rose to 50.1 from August's 47.8, crossing the 50 threshold and beating consensus of 48.0 by 2.1 points. The reversal marks the first time since May that the services employment index has registered expansion, though it remains near the neutral level.

The Federal Reserve raised rates to 3.75-4.00 percent on September 16 in its first hike in more than a year, responding to persistent inflation pressures driven by petroleum cost shocks and an uncertain tariff environment. The central bank is now looking for evidence that one hike was sufficient to bring inflation under control without triggering a recession.

Fed Faces Difficult Decision

A services prices paid index running at 74.0 and accelerating does not support the case that one hike was enough. The manufacturing-to-services cost pipeline remains pressurized, with manufacturers having reported their own elevated prices paid readings in recent months.

The next ISM Services report, covering October activity, will be released on November 4. That report, along with the October consumer price index data due November 10, will be critical in determining whether the Fed needs to raise rates again at its December meeting or whether inflation has finally begun to moderate.

Market participants will also be watching for any Fed official speeches in the coming weeks for signals about the central bank's thinking on the appropriate path for interest rates. The combination of elevated services prices and resilient demand suggests that the Fed's inflation fight is far from over.