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What does a PMI reading above 50 mean?
PMI is a diffusion index built from survey responses about whether selected business conditions rose, fell, or stayed the same compared with the previous month. In the general calculation, the share reporting “higher” is added to half the share reporting “unchanged.” S&P Global summarizes it as “PMI = (% Higher) + 0.5 × (% Unchanged).” The 50 mark is the no-change boundary: above 50 indicates that increases were more prevalent overall, while below 50 indicates that decreases were more prevalent. It is not a percentage change in output, nor a measure of the absolute level of production. See J.P. Morgan Global Manufacturing PMI survey methodology.
PMIs are not direct counts of factory output in dollars or physical units. They capture the direction of reported change across a defined survey panel, so a reading well above 50 does not tell you how large the increase was in production. Survey coverage also depends on the program: S&P Global describes national panels of around 400 companies and surveys covering manufacturing, services, construction, and whole-economy sectors; the J.P. Morgan global manufacturing program describes surveys across more than 40 countries and around 13,500 companies in total. Those figures describe those named programs, not every PMI. See S&P Global’s PMI overview.
Why the PMI provider and index construction matter
“PMI” is not one universally constructed index. Providers may use different component weights and seasonal-adjustment practices, so their headline values are not interchangeable. Identify the provider and the exact series before comparing readings.
- S&P Global manufacturing PMI: its composite assigns 30% to new orders, 25% to output, 20% to employment, 15% to supplier delivery times (inverted), and 10% to stocks of purchases.
- ISM manufacturing PMI: ISM describes its composite as five equally weighted diffusion indexes; new orders, production, employment, and inventories are seasonally adjusted. The ISM manufacturing report is released on the first business day of the month at 10:00 a.m., according to ISM’s reports and calendar page.
The two composites can therefore tell somewhat different stories without either being an error: they use different survey programs and constructions. S&P Global’s PMI data FAQ details its component weights, while ISM explains its methodology in About This Report.
What the Census factory-orders report measures
The Census Bureau’s M3 report covers manufacturing shipments, new orders net of cancellations, unfilled orders (backlog), and inventories. Inventory data include materials and supplies, work in process, and finished goods. Unlike a PMI, these are reported dollar values rather than a diffusion measure of direction. Census describes the report’s purpose as providing “broad-based monthly statistical data on current economic conditions and indications of future production commitments in the manufacturing sector.” See M3 About the Surveys.
Census describes reported new orders as shipments plus the net change in unfilled orders from the previous month. In practical terms, orders can rise because shipments were strong, because the backlog grew, or through a combination of both. Read new orders alongside shipments and unfilled orders rather than treating the headline as a direct measure of current production. The relationship is described in the Census Bureau’s M3 Unfilled Orders survey documentation.
How to interpret a factory-orders jump
A large monthly change is a prompt to inspect the report, not a standalone verdict. Work through the release in this order:
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- Check which report you are reading. The advance durable-goods report covers durable manufacturing, while the full M3 report covers both durable and nondurable manufacturing. Do not compare the advance report’s scope with the full report as if they were identical.
- Read shipments with new orders. Shipments indicate the value of goods sent during the period; orders describe incoming commitments. An orders increase with a different shipments pattern is not the same story as an increase in both.
- Inspect unfilled orders. A growing backlog can contribute to the new-orders figure and suggests commitments have not yet been shipped. A falling backlog changes how an orders headline should be understood.
- Check inventories. Materials, work in process, and finished-goods stocks help show whether changes in orders are accompanied by changes elsewhere in the production pipeline.
- Compare the monthly result with recent months. One observation can be volatile. S&P Global uses three-month-over-three-month changes in official data for some comparisons because they are less volatile than month-on-month changes while remaining more timely than annual comparisons. This is an analytical approach, not a rule that fits every series. See S&P Global’s PMI and ISM survey comparisons.
How to read PMI and M3 together
Use each measure for the question it can answer. PMI components can provide a timely survey signal about the direction of new orders, output, employment, inventories, or supplier delivery times, depending on the provider. M3 gives dollar-valued measures of orders, shipments, backlog, and inventories. Their percentage changes should not be compared as if they measured the same quantity.
A practical reading sequence is:
- Name the release, provider, and reference month; note whether a Census figure is from the advance durable-goods report or the full M3 report.
- Classify the measure: survey diffusion index or dollar-valued reported series.
- Read the headline with the relevant components: for PMI, consider new orders and output along with other published subindexes; for M3, examine shipments, unfilled orders, and inventories alongside new orders.
- Compare with recent releases or a suitable multi-month view, rather than making a business-cycle call from one monthly move.
- State the conclusion narrowly: the data are one signal about manufacturing conditions, not proof by themselves of a broad expansion, contraction, or turning point.
Release timing and coverage can explain apparent mismatches
The releases do not arrive together or cover precisely the same things. Census says the advance durable-goods report generally appears about 18 working days after its reference month, while the full M3 report, covering durable and nondurable manufacturing, generally appears about 23 working days after it. ISM says its manufacturing PMI is released on the first business day of the month at 10:00 a.m. Schedules can vary, so consult the live calendar for the particular release before relying on a date. See Census M3 survey documentation and the ISM reports and calendar page.
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As a result, a PMI and an M3 figure discussed in the same news cycle may refer to different reference periods or have different coverage. Before treating them as contradictory, check the month each describes, whether the Census report is advance or full, and which PMI provider and index are being cited.
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