A survey that pointed to solid expansion in July flipped to its weakest reading in months, missing forecasts by roughly ten points.
The Chicago Business Barometer, known as the Chicago PMI, fell to 47.1 in August, down from 57.6 in July and well short of the 57.9 economists had expected. A reading below 50 signals contraction in regional manufacturing activity, and the size of the move, a swing from solidly above the growth threshold to solidly below it in a single month, is unusual for a survey that had been signaling expansion just weeks earlier.
Forecasters had penciled in a second consecutive month near 58, extending a run of expansion readings. Instead, the index reversed entirely, landing among the sharper monthly misses the survey has produced this cycle. Regional manufacturing data of this kind carries limited weight on its own, but a reading this far from consensus lands the same week the Federal Reserve chair used his own remarks to argue inflation, not growth, remains the central bank's priority. A soft manufacturing print does not resolve that argument on its own. It does add a second, independent data point pointing toward a slower economy just as investors are working out how much weight to put on this week's other, more market-moving signal: a sharp same-day repricing of September rate-hike odds.
What matters next is whether the weakness in this survey shows up in the broader national manufacturing data and other regional gauges due in the coming weeks, or whether it proves to be an outlier month within a series thin enough that single-month swings can be noisy.