Six Month Lag

Inflation, finance, economics.

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Month: April 2026

Price pressures were increasing before the Iran War

Today’s core PCE release covered prices through February 2026. The Iran War began with February 28 airstrikes on Iran by the US and Israel; the latest release thus establishes a baseline before oil and natural gas prices began their upward climb.

The preferred 6 month percentage change in core PCE ticked up to 3.4% in February; the more commonly reported 12 month percentage change was 3.0%. My model suggests that the probability that underlying inflation has increased over the preceding 6 months is 81%. The report implies elevated price pressures before the Iran War started. We are a ways away from the Fed’s 2.0% long run target.

Annualized three month percentage changes in inflation were 4.4%, but I would ignore that figure: you can see how noisy the red dashed lines are above. Focus on the light green line, which best estimates the thick blue line showing underlying inflation, but only with a lag.

The graph above reports real time unrevised data, so that the probabilities in the lower portion are meaningful and comparable. There’s a break in the series for October 2025 due to the government shutdown, which is smoothed over above.