A Factory Survey Crossed 50. What Does That Really Mean?

A factory manager fills in a monthly survey: orders were a little better, production picked up. Combine thousands of answers and you get a purchasing managers’ index, or PMI.

China’s official factory gauge moved to 50.1 in September. It is better read as a direction sign than a speedometer. Fifty separates expansion from contraction in the survey: above it, more respondents reported improving conditions than worsening ones. The distance above 50 does not translate directly into a percentage increase in factory output.

That is why a PMI can improve while households remain cautious. Factories may receive more orders from overseas even as families at home spend carefully. Manufacturing and services were just into expansion in China’s latest release, while analysts still pointed to weak domestic demand and the property downturn. Both facts can be true at once.

The index offers an early read on momentum before official production data arrive. New orders may hint at what firms expect to produce; employment responses can show whether managers are adding staff. It cannot tell us whether wages are rising or a household feels better off.

Think of the PMI as asking managers, “Is business getting better or worse than last month?” Useful question. Different from, “How much did the economy grow?”