Spanish CPI Prel (Sep MM) 0.3% (Prev. 0.7%)

The transmission channel runs through the euro flash estimate and from there into ECB rate expectations priced at the front of the euribor curve, with Spain's weight and its early timing giving it signalling value disproportionate to its size. A monthly reading decelerating from the prior pace points to softer sequential momentum, though the distinction that matters is between the headline month-on-month rate and the year-on-year rate plus core, since base effects and energy pass-through can flatter or flatter the headline while the underlying trend runs elsewhere. Preliminary Spanish prints also carry a regional breakdown, and the services component has been the tell in recent cycles given the ECB's stated focus on domestic price pressures. The follow-ons are the German state prints and the euro area flash, which determine whether this reads as idiosyncratic or as the start of a broader disinflationary signal for the bloc.