What Is the Purchasing Managers’ Index (PMI)?
The purchasing managers’ index, or PMI, is a financial metric derived from a survey completed by purchasing managers in the manufacturing sector. It’s published monthly in many major economies and is widely watched as an early indicator of overall economic momentum.
How the PMI Is Calculated and Read
PMI survey responses typically cover areas such as new orders, production levels, employment, and supplier deliveries, which are combined into a single index figure. A reading above 50 generally indicates expansion in the sector being measured, while a reading below 50 generally points to contraction.
Why the PMI Matters for Traders
Because the PMI is released relatively quickly after the survey period and ahead of many other official economic statistics, it’s often treated as an early, real-time read on economic health. A notable surprise, particularly a sharp move away from expectations, can move currency and equity markets meaningfully around the release time.
Manufacturing PMI vs Services PMI
While the original PMI focused specifically on manufacturing, many countries now also publish a services PMI, covering activity in that much larger part of many developed economies. A composite PMI, blending both manufacturing and services data, is also commonly used to give a broader read on overall economic activity.
PMI Data Can Be Revised: What to Keep in Mind
As a precaution, PMI figures are based on survey responses and sentiment, meaning they can be revised in subsequent releases and don’t always perfectly align with harder, lagging economic data published later. Treating a single PMI reading as a definitive signal, rather than one part of a broader data picture, can lead to overreacting to noise.
Reading Economic Momentum Through the PMI
The PMI offers one of the earliest, most closely watched snapshots of how an economy’s manufacturing or services sector is performing in real time. Following it alongside other economic indicators helps build a more complete picture of the broader fundamental backdrop driving markets.
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