US CPI (Sep YY) 3.7% vs. Exp. 3.6% (Prev. 3.4%)

An upside surprise on headline CPI with the annual rate re-accelerating off the prior month fits the most market-sensitive variant of this release: not just a miss against consensus but a reversal of the disinflationary trend, which historically has carried more weight with the front end than a sideways print. The established sequence on such prints is an immediate repricing of near-term policy expectations, with the two-year and the front of the SOFR strip absorbing the bulk of the move while the longer end takes its cue from whether the surprise reads as inflation persistence or as base effects and energy pass-through. The critical distinction for follow-through is the composition: headline beats driven by energy and volatile components have tended to fade within the session, whereas beats accompanied by firm core services or shelter readings have historically held and pulled forward hawkish official commentary. Attention now turns to the core monthly rate and the supercore detail, then to whether Fed speakers treat the print as noise or as evidence, since in past stop-start disinflation episodes it has been the committee's reaction function to a single upside surprise, rather than the surprise itself, that set the direction of rates into the next meeting. The dollar typically follows the front-end repricing, with rate differential widening the transmission channel rather than risk sentiment.