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US September ISM Services Business Activity Falls to 56.5, Resurgent Inflation Tests the Federal Reserve

2026-10-06

  1. Core Overview According to the latest data, the US ISM Services Business Activity Index for the third quarter (September) of 2026 dropped significantly to 56.5, cooling notably from the 4-year high of 61.7 in the previous month. This dragged the overall ISM Services PMI down slightly to 54.9, slightly below the market consensus expectation of 55.0. Despite the slowdown in growth, the index has remained firmly in expansionary territory for 27 consecutive months, indicating that the underlying tone of the US services sector remains solid.

  2. Key Details The detailed data showed a divergent trend of "slowing supply and demand, surging costs." The New Orders Index fell from 60.9 to 59.8; although momentum slightly decreased, it remains supportive. The Employment Index rebounded from 47.8 to 50.1, ending two consecutive months of contraction. However, the most closely watched Prices Paid Index rebounded strongly to 74.0, far exceeding the expected 72.9, marking the highest level since July 2022.

  3. In-Depth Attribution The sharp rise in service sector costs mainly stems from the impact of the external macroeconomic environment. According to foreign media InvestingLive, rising fuel prices, tariff policies, and supply chain bottlenecks are key factors driving up corporate operating costs. Analysts at financial institution Verified Investing also pointed out that the contrarian jump in the price index means that inflation is not a temporary fluctuation, but has entered a stage of "substantial re-acceleration," with cost pressures from front-end manufacturing rapidly transmitting to the services end.

  4. Outlook and Risks In the short term (1-2 months), a strong backlog of orders can still support the expansion of the services sector, but soaring operating costs will erode corporate profits. Investors need to be wary of the risk of downward revisions to earnings guidance during the US earnings season. In the medium term (3-6 months), persistently high inflation data will become the biggest variable. After the Federal Reserve just adjusted interest rates in September, the higher-than-expected services price index will confront policymakers with a tougher choice, and may even force the market to reprice the future interest rate path.

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