PMI (Purchasing Managers' Index)

How it works

The Purchasing Managers' Index is built from monthly surveys of purchasing executives at companies, asking about new orders, output, employment, supplier delivery times and inventories. The individual responses are distilled into a single headline number on a 0-100 scale. The crucial pivot point is 50: a reading above means activity is expanding versus the previous month, while below means it is contracting.

Because it is survey-based and released very early in the month, the PMI is a valued leading indicator — it often signals turning points before official GDP or industrial-production data confirm the shift.

In India

India gets separate Manufacturing PMI and Services PMI readings, compiled by S&P Global (formerly IHS Markit) and released near the start of each month. India's PMIs have generally stayed firmly in expansion territory, frequently among the strongest among major economies globally, reflecting resilient domestic demand.

The services PMI carries extra weight given how large the services sector is within India's economy. A composite PMI blends both the manufacturing and services readings into one overall gauge of private-sector activity.

Why it matters

The PMI gives investors and policymakers an early read on the economy's underlying pulse — valuable precisely because markets are forward-looking and react to momentum shifts before the hard data arrives. Sustained strong PMIs support optimism on corporate earnings; a slide below the 50 mark flags trouble brewing ahead.

Common mistakes

Don't over-read a single month — look instead at the trend and whether the gap from 50 is widening or narrowing over several readings. Remember the PMI measures direction versus last month, not absolute size; a reading of 52 following a 58 still means growth, just at a slower pace. And because it is sentiment-based and survey-driven, it can occasionally diverge from the official hard statistics, so treat it as a timely directional signal rather than a precise measurement of output.