The composite PMI hides a delivery in two halves

THE HEADLINE NUMBER from America's latest purchasing managers' index is impressive. The composite PMI, a gauge of private-sector output spanning manufacturing and services, hit 56 in early August, marking the strongest expansion since April 2022. That is the sort of figure that makes central bankers exhale and economists revise their growth models upward. It is also a bit of an illusion.

The composite's 52-month high in business growth is almost entirely a services story. The services sector recorded its fastest pace of activity since December 2024, growing at its strongest rate in nearly two years. Manufacturing, by contrast, posted its weakest increase in 13 months. The composite makes both halves look equally buoyant. They are not.

This is not a failure of the index so much as a hazard of its architecture. The composite PMI weights services far more heavily than manufacturing, reflecting the fact that services account for roughly 80% of America's private economy. A surge in services will always dominate the headline. The trouble is that it also obscures what is happening in the smaller half. Manufacturing output has been held back by reduced inventory building and supply disruptions. The sector is still expanding — a reading of 53.2, unchanged from the prior month, is above the 50-point threshold separating growth from contraction — but its momentum is fading while services accelerate.

The divergence is no accident. It reflects structural forces that have been working for years. Services are sheltered from global trade friction; manufacturing is not. The goods-producing sector bears the brunt of tariff costs, supply-chain reshuffling and competitive pressure from Asian producers. Services — healthcare, business consulting, entertainment, hospitality — face none of these headwinds. In July, the services sector received a temporary lift from the FIFA World Cup and the 250th anniversary of the United States, both of which boosted travel and hospitality spending. Such one-off events are not enough to sustain the kind of acceleration that services recorded in August, but they illustrate the sector's domestic insulation.

Employment tells a similar mixed tale. Hiring grew at the fastest pace since early 2025, but the jobs are flowing into services. Manufacturers, still managing through supply-chain uncertainty, have been less keen to add staff. Business confidence reached a nine-month high, yet that optimism is concentrated among service firms that are seeing order books swell. The manufacturers' mood is less sanguine.

Inflation adds another wrinkle. Selling prices moderated slightly, which is welcome news for a Federal Reserve that has been trying to judge whether inflation is genuinely on the way down. But input costs remain elevated, driven higher by energy prices. Manufacturers are absorbing more of that cost squeeze than service providers, who tend to pass it on more readily. The result is margin pressure where it matters most for investment: in the sector that builds things.

To be sure, the services boom is real, not an artefact of survey methodology. New business orders in services have been increasing steadily, and delivery times have lengthened significantly, a sign that demand is outstripping capacity. The sector is pulling in new workers and raising prices. If the American economy were run by a single lever, the services half would suggest that the lever is set well to the right.

But economies are not single-lever machines. The real question is what happens when the two halves diverge for long. Manufacturing does not merely make things; it creates the productive capacity that eventually lifts living standards. When manufacturing weakens while services boom, the economy can look strong in the aggregate while losing ground in the sectors that drive long-run productivity. The pattern is familiar in other mature economies: France and Japan have seen services outpace manufacturing for years, with the composite masking an increasingly lopsided growth profile.

The Federal Reserve, watching the composite, could easily conclude that the economy is hot enough to warrant holding rates steady or even tightening further. That would be a reasonable inference from the 56. It would also overlook the fact that the goods side of the economy is sputtering. A rate path calibrated to a services-heavy composite risks being too tight for manufacturing and too loose for services simultaneously. That is not an impossible position for a central bank to occupy, but it is a difficult one.

The broader lesson is not that the PMI is misleading. It is that no single gauge captures the whole story. The composite is a useful summary of where the economy is heading. It is less useful as a proxy for which parts of the economy are thriving and which are struggling. Investors and policymakers who treat it as a thermometer will see only the average temperature. Those who look at the components will see that one room is overheating and another is cooling down.

The aim should be to understand both, not to comfort oneself with the headline.