ForecastingStocks

Beyond inflation and jobs, two families of data tell the market how fast economies are actually growing: official GDP releases and the timely PMI surveys.

GDP releases — the official scorecard

GDP figures are published quarterly (by the IBGE in Brazil, the BEA in the US, Eurostat in Europe). They are the definitive measure of growth, but they have a drawback: they are backward-looking and slow, often revised, describing a quarter that already ended months ago.

Markets still react to GDP surprises — a much weaker print can revive recession fears and rate-cut bets; a strong one can do the reverse — but precisely because the data lags, investors crave something faster. That is where PMIs come in.

PMI — the economy in near real time

The PMI (Purchasing Managers' Index) is a monthly survey of business managers asking whether activity — new orders, production, employment, prices — is rising or falling versus the prior month. Its genius is a simple 50 line:

A PMI above 50 signals expansion.
A PMI below 50 signals contraction.
The distance from 50 indicates how fast.

Because it is a survey, the PMI is released before the hard data it predicts, making it a prized leading indicator of where GDP, employment and the cycle are heading. Separate PMIs cover manufacturing and services.

How investors use them together

PMIs give an early, monthly heartbeat — a manufacturing PMI tumbling below 50 is an early warning of slowdown that markets price in immediately.
GDP later confirms (or contradicts) what the PMIs hinted.

For a Brazilian investor, watching both the local and the major global PMIs (US, China, Europe) is invaluable — especially China's, given how much Brazilian commodity demand and the real depend on Chinese growth.