PMI Internals

What Is PMI Internals?

PMI internals refers to the practice of dissecting the subcomponents of Purchasing Managers' Index surveys — both the ISM Manufacturing and Services PMIs in the US, and equivalents like the Eurozone S&P Global PMI — rather than relying solely on the composite headline reading. The headline PMI is a diffusion index where readings above 50 indicate expansion and below 50 indicate contraction, but the real alpha lies in understanding the composition of that number.

Key subcomponents include:

• New Orders: The most forward-looking component; a proxy for future production demand
• Inventories: When inventories rise alongside falling new orders, a destocking cycle is imminent
• Prices Paid: A leading indicator for producer inflation and ultimately CPI/PCE
• Employment: Lags new orders by 1–3 months; important for NFP forecasting
• Supplier Deliveries: Measures supply chain stress; longer delivery times inflate the headline artificially
• New Export Orders: Captures global demand dynamics, especially relevant for cyclical FX pairs

Why It Matters for Traders

The headline PMI can be deeply misleading without context. A PMI of 51 driven entirely by rising inventories and slower supplier deliveries may actually be bearish for future output, while a PMI of 48 with surging new orders and falling inventories signals a coming reacceleration. This distinction has significant implications for sector rotation between cyclicals and defensives, for credit spread direction, and for central bank reaction functions.

For macro traders, the new orders minus inventories spread (NO-INV) within ISM Manufacturing is arguably the single highest-signal leading indicator for industrial production 2–3 months forward. When this spread turns sharply positive from deeply negative levels, it typically precedes a trough in manufacturing activity and has historically been a reliable signal to add exposure to industrial and materials equities.

How to Read and Interpret It

Practitioners focus on these key relationships:

• New Orders minus Inventories > +5: Strong restocking cycle likely ahead; bullish for industrials and cyclical commodities
• New Orders minus Inventories < -10: Destocking underway; bearish for materials and manufacturing-linked currencies (AUD, KRW, EUR)
• Prices Paid above 60: Inflationary pressure building in the pipeline; watch for CPI follow-through in 1–2 months
• Prices Paid collapsing from above 80 to below 50: Disinflationary impulse ahead; historically bullish for duration (long bonds)
• ISM Employment subindex below 45: Historically consistent with payrolls weakness; elevates risk of a negative NFP surprise

Always compare the ISM Manufacturing new orders to Services new orders to understand whether weakness is sector-specific or economy-wide.

Historical Context

During 2021–2022, the ISM Manufacturing Prices Paid subindex surged to 87.1 in June 2021 — a level not seen since the 1970s — well before headline CPI peaked above 9% in June 2022. Traders who tracked this component had approximately 6–9 months of advance warning that goods inflation was becoming systemic. Conversely, by late 2022, the New Orders minus Inventories spread within ISM Manufacturing plunged to approximately -14, accurately signaling the sharp goods deflation and industrial contraction that characterized 2023, even as services remained resilient.

Limitations and Caveats

PMI surveys are sentiment-based diffusion indices, not volume measures — they capture whether conditions are improving or deteriorating, not the magnitude of change. Survey respondent composition can shift over time, biasing results. The Supplier Deliveries component is structurally flawed: supply chain disruptions artificially inflate the headline by being counted as expansionary when deliveries slow, as occurred dramatically during 2021. International PMIs also vary in methodology; direct comparison between ISM and S&P Global PMIs requires caution.

What to Watch

• Monthly ISM Manufacturing and Services releases on the first and third business days of each month
• New Orders component relative to the 6-month trend for cycle turning point signals
• Prices Paid versus real yield divergences that may signal misaligned inflation expectations
• China Caixin PMI internals as a barometer for global industrial demand and commodity cycle direction