As Pimco’s Tiffany Wilding illustrates in the following chart, there are reasons why the Fed might prefer not to target core PCE, marked in red. For years, it reliably produced a lower number than other measures, but it’s recently flipped to register the highest. That could fuel the Fed into a hawkish mistake, just as this measure might not have sounded the alarm sufficiently before the post-Covid inflation spike.

Wilding suggests that two categories are responsible for the discrepancy. Both are obviously important at present. The following chart shows core PCE with and without software and portfolio management (which because it is typically charged as a percentage of assets will often show rising inflation when stock market returns are good). The problem for the Fed may, then, be the AI buildout and the inflation it can generate in the short term.