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PMI Data, The Early Warning Signal

The Purchasing Managers' Index (PMI) is a survey-based indicator that shows the direction of economic activity in manufacturing and services. It's published monthly, often before other data, which makes it useful as an early signal.

How to read it:

- A reading above 50 suggests expansion
- A reading below 50 suggests contraction
- The further from 50, the stronger the signal

Why traders pay attention:

- It's timely, since it comes out earlier than many hard data releases
- It reflects business sentiment and orders
- Surprises can shift expectations about growth and policy

Common versions:

- Manufacturing PMI
- Services PMI
- Composite PMI, which combines both

Practical use:

1. Check the calendar. PMI releases often occur at the start of the month and mid to late month for flash estimates.

2. Compare with expectations. Look at actual versus forecast.

3. Look at the trend. A rising or falling pattern over several months tells more than a single number.

4. Compare countries. For example, a stronger European PMI than US PMI might add support to the euro, all else equal.

5. Combine with technical analysis. If a surprise aligns with your bias at a key level, it can add confidence.

PMI reactions are usually smaller than those to employment or inflation data, but they can still move price.

Think of PMI as a thermometer reading of business activity, not a complete diagnosis.

Good summary. Two practical details I'd add from trading the flash releases.

First, the eurozone flash numbers arrive in sequence: France, then Germany fifteen minutes later, then the eurozone aggregate half an hour after that. By the time the composite prints, a large part of it is already implied by the first two, so the biggest EURUSD reaction is often on the German figure, not the headline everyone has in their calendar.

Second, the direction of change matters as much as the 50 line. A move from 46 to 48 is still contraction, but it is a lot less contraction than expected, and the euro can rally on it. I have seen people sell a "below 50" print and get run over for exactly that reason.

For the US I watch ISM more than S&P Global, and inside ISM the prices paid component can matter more than the headline when inflation is the market's main worry.

How I use PMI in practice: I'm not watching whether it's above or below 50 so much as whether it's moving in the same direction as last month. A rising PMI that's still under 50 can still support a currency if it's improving faster than expected.