US CPI (Aug YY) 3.4% vs. Exp. 3.4% (Prev. 3.4%)

An in-line headline print at 3.4% against 3.4% expected and unchanged from the prior month removes the surprise element that normally drives the initial rates and dollar reaction, and past episodes of exactly-expected CPI have tended to pass price discovery quickly to the internals: core versus headline, shelter stickiness, and the goods-services split. The transmission channel in this setup is the gap between the headline and the underlying monthly run-rate, since an unchanged annual rate can mask either a soft monthly print diluted by base effects or a firm one offset by them, and front-end pricing has historically responded more to the monthly core pace than to the year-on-year match. Unchanged headline with an in-line core has generally left the policy path priced as it was, with the curve moving only if the supercore or services-ex-shelter detail breaks from trend. What separates a quiet release from a repricing one here is the composition, not the number: a headline held steady by energy while services cool reads dovish at the margin, while the reverse reads hawkish. The follow-ons are the PPI release, the Fed speaker calendar, and whether the detail shifts the balance of commentary ahead of the next meeting.