Why is manufacturing PMI so high, but price growth is also happening?

Expansion is clear; acceleration depends on the survey

Start with what “high” means. ISM’s September headline eased to 54.5 from 54.6 in August. S&P Global’s separate manufacturing PMI rose to 55.9 from 53.9, its strongest since May 2022. The first showed nearly steady expansion; the second showed acceleration. Their different readings should remain distinct. [1][2]

ISM builds its headline from five equally weighted components: new orders, production, employment, supplier deliveries and inventories. Prices paid sits outside that calculation. Its September rise from 71.1 to 77.9—a calculated increase of 6.8 index points—signals more widespread upward input-price pressure. [1]

That construction explains why the headline can remain expansionary while costs rise sharply. It also makes the component mix worth examining. Orders and employment strengthened in September, while the production index eased and inventories moved below neutral. [1]

Delivery times require particular care. ISM scores slower deliveries positively in the composite. September’s delivery index of 59.0 therefore added 1.8 headline points relative to neutral deliveries: the nine-point distance from 50 multiplied by its 20% weight. Holding the other four components fixed and setting deliveries to 50 leaves a hypothetical PMI of 52.7. This sensitivity isolates the index arithmetic; it carries no causal estimate of supply disruption. [1]

The level and the monthly movement tell different stories. Deliveries remained slower, but the index eased from 59.3 to 59.0, slightly reducing September’s headline. The production component itself stood at 56.7, above the composite. [1]

Energy supplies a concrete reason for rising costs

The survey mechanics explain coexistence. Producer-price data show one force operating underneath it: energy.

In August, final-demand goods prices rose 1.1%. Energy prices increased 4.2% and accounted for over three-quarters of that goods-price rise. Across goods and services together, total final-demand PPI increased 0.4%. The energy attribution belongs specifically to the goods component. [5]

September’s S&P survey then reported faster input-cost increases, with higher energy and fuel costs widely reported. It also described busy suppliers and capacity concerns. Taken together, these observations support a material cost-pressure channel alongside expanding activity, although the August producer-price release and September survey measure different periods and prices. [2][5]

We are skeptical of a tariffs-only explanation. Tariffs remain a possible channel, but the retained evidence provides no September contribution. An August 18 St. Louis Fed analysis reported effective tariffs declining from an 11% peak in late 2025 to just below 7% by May, with modeled inflation effects stabilizing. That is useful historical context whose observation window ends well before the September survey. [6]

Demand deserves more weight than a pure cost-shock story allows

Our caution about a manufacturing boom rests on the official data. August manufacturing output fell 0.3%, while nominal factory orders rose 0.1%. Those are subdued latest-month readings, and the orders figure includes price changes. [3][4]

The strongest case against that caution is substantial. August’s production decline followed seven consecutive monthly increases. S&P’s stronger September headline came with faster output, new orders and hiring. September could therefore represent genuine acceleration beyond the month captured in the available official output figures. We give that possibility meaningful weight. [3][2]

Our judgment remains deliberately balanced: demand strength belongs in the explanation, alongside energy-related cost pressure. The evidence cannot allocate September’s price increases between them. [2][5]

The investment question is whether selling prices keep pace with costs

A manufacturing prices-paid index is only the beginning of the transmission chain. August consumer prices rose 0.4% over the month and 3.4% over twelve months. That household basket includes goods and services, while ISM records manufacturers’ input-price direction. Moving from one to the other requires evidence about pass-through. [7][1]

For investors, our focus is whether companies have real demand and can keep selling prices abreast of costs. A busier factory can still face margin pressure. The aggregate survey leaves that company-level outcome open.

GE Vernova provides a bounded example of strong demand accompanied by reported profitability. Its July 22 release put second-quarter revenue at $11.1 billion, up 22%, orders at $24.2 billion, and adjusted EBITDA margin at 11.3%. These global company results show why individual order books and margins deserve attention alongside the macro survey. Its turbine-output expansion plans remain prospective. [8]

We would shift toward a demand-led interpretation if subsequent real manufacturing output and shipments strengthened broadly alongside orders. Continued expansion with normalizing delivery times would reinforce that reading. Easing energy costs alongside persistent input-price pressure would reduce energy’s explanatory weight; a tariff explanation would need matched evidence from exposed and comparable unexposed products.

The decisive company disclosures will separate volumes, selling prices, input costs and margins. The question for earnings is how much of the additional activity survives the additional cost.