US CPI s.a (Aug) 334.131 (Prev. 332.81)

Seasonally adjusted headline CPI is the secondary series in this pairing: the Fed's reaction function and the rates market key off core, so the transmission runs through how the implied core rate lands against consensus, and from there into the short end of the curve via the expected timing of the next policy move rather than the level of rates. A distinction worth drawing is between energy-driven headline moves and sticky services or shelter components: the former has historically been looked through by both the Fed and the curve, the latter has not. The pattern in prior cycles is that a single print shifts the distribution around the next meeting only modestly, and it is the run-rate over successive releases that resets the path. The immediate follow-ons are the core detail, the shelter and supercore breakdown within the release, and how the print sits against the prevailing trend of recent months.