Macro & Central BanksPMIDiffusion Index
Purchasing Managers' Index (PMI)
A survey-based diffusion index of business conditions in which a reading above 50 signals expansion and below 50 signals contraction.
What Purchasing Managers' Index (PMI) means
A Purchasing Managers' Index is built from monthly surveys of senior purchasing executives at a panel of companies, who report whether output, new orders, employment, supplier delivery times and inventories improved, worsened or stayed the same. Responses are combined into a diffusion index where 50 is the dividing line: above 50 means a majority of firms report improvement, so the sector is expanding, and below 50 means contraction. Separate manufacturing, services and composite indices are published for most major economies, typically ahead of the hard data covering the same month.
PMIs move currencies because they are timely. Preliminary flash estimates arrive before quarter-end and before official output statistics, so they reshape growth expectations early and feed straight into rate-path pricing. They are also directly comparable across countries, which makes them useful for relative-value trades between currency pairs. The caveats are that a diffusion index records breadth of change rather than magnitude, so it says nothing about how much output moved, and survey sentiment can diverge from measured activity for extended periods, especially around shocks.
Worked example
A euro-area composite PMI rising from 48.6 to 51.2 signals a shift from contraction to expansion, and EUR/USD might lift from around 1.0850 to 1.0900 as traders trim expectations for policy easing. Illustrative hypothetical.
Related terms
- Gross Domestic Product (GDP)The total market value of goods and services produced within an economy over a given period, the broadest measure of economic activity.
- RecessionA significant, broad-based decline in economic activity lasting more than a few months, commonly proxied by two consecutive quarters of falling GDP.
- Risk-On / Risk-OffA framework describing how markets rotate between appetite for higher-yielding assets and demand for defensive ones.
- Economic CalendarA schedule of upcoming data releases, central bank events and speeches, with forecast and prior figures and an importance rating.
Frequently asked questions
What does Purchasing Managers' Index (PMI) mean in forex trading?
A survey-based diffusion index of business conditions in which a reading above 50 signals expansion and below 50 signals contraction.
How does Purchasing Managers' Index (PMI) work in practice?
PMIs move currencies because they are timely. Preliminary flash estimates arrive before quarter-end and before official output statistics, so they reshape growth expectations early and feed straight into rate-path pricing. They are also directly comparable across countries, which makes them useful for relative-value trades between currency pairs. The caveats are that a diffusion index records breadth of change rather than magnitude, so it says nothing about how much output moved, and survey sentiment can diverge from measured activity for extended periods, especially around shocks.
What is an example of Purchasing Managers' Index (PMI)?
A euro-area composite PMI rising from 48.6 to 51.2 signals a shift from contraction to expansion, and EUR/USD might lift from around 1.0850 to 1.0900 as traders trim expectations for policy easing. Illustrative hypothetical.
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