Core PCE Price Index

PCE (Personal Consumption Expenditures) Price Index measures price changes across a broader, dynamically-weighted basket than CPI -- it adjusts for consumers substituting goods as relative prices shift (buying chicken instead of beef if beef gets pricier), which CPI's fixed basket doesn't do. "Core" strips out food and energy, same reasoning as core CPI. The Fed has explicitly named Core PCE YoY as its primary inflation target -- the well-known 2% target is a PCE target, not a CPI one.

CPI for the same month typically releases about two weeks before PCE, so some of PCE's signal is already partly known by the time it lands. But PCE is derived partly from separate business-side survey data, not just a re-packaging of CPI, so it can genuinely diverge from what CPI implied -- and because it's the Fed's own stated target, a PCE surprise that contradicts the CPI-implied picture gets outsized attention, especially right around FOMC meetings.

Suppose Core PCE MoM is expected at +0.2% and comes in at +0.4% -- double the expected pace. Even if that month's CPI print had looked benign, this PCE beat -- landing on the Fed's own explicitly preferred gauge -- can meaningfully shift market pricing toward "the Fed holds rates higher for longer," strengthening the currency precisely because it's the number policymakers themselves say they're targeting.