Walsh rewrites "Fed's favorite inflation indicator": Will the "underestimation of inflation" in 2021 be repeated?

Core PCE inflation is running at 3.3% year over year, while the Dallas Fed's trimmed mean PCE is 2.3% in April, creating a 100bp+ divergence that could shape the Fed's rate path. The article argues that relying on the trimmed mean may understate inflation by about 48bps, especially as tariffs, AI-related demand, and other price shocks broaden the inflation distribution. Markets may read this as a more dovish Fed framework near term, but with a meaningful risk of repeating the 2021 underestimation error.

Analysis

The real market issue is not whether the Fed has found a ‘better’ inflation gauge, but whether it is changing the loss function in a way that systematically underprices sticky inflation risk. If trimmed-mean data is given primacy while tariff- and AI-linked price pressure is spreading across a wider share of the basket, the Fed can ease into a still-heating economy — a setup that would steepen the front end only after the market has already priced cuts too aggressively. That is the second-order risk: a dovish framework shift can compress term premia in the short run, but it raises the odds of a later repricing in 2Y-5Y yields once the broader distribution of prices keeps drifting upward.

The biggest beneficiaries are duration-sensitive assets that trade off the path of policy rather than the level of inflation: long-dated growth, high-multiple software, and rate levered housing/real estate proxies. The losers are assets whose valuation depends on stable real yields and credible disinflation — particularly small caps with weak pricing power and levered balance sheets, where a delayed Fed response keeps refinancing windows open just as input costs remain sticky. Tariff intensity is also a hidden second-order wedge for industrial supply chains: suppliers with pass-through power win, while import-heavy retailers and lower-margin consumer names face margin compression even if headline inflation looks benign.

The contrarian read is that the consensus may be underestimating how quickly the Fed could pivot back to hawkishness if the alternative measure is exposed as a false comfort metric. The market has been trained to treat soft inflation prints as a clean path to cuts, but if the underlying distribution continues to widen, the Fed may have to reprice in one or two meetings rather than one or two quarters. That creates a classic asymmetry: limited upside if cuts arrive on schedule, but material downside in duration if the Fed is forced to admit the preferred gauge lagged reality.

Key Decisions for Investors

• Short front-end duration via TLT puts or outright short IEF over the next 4-8 weeks; risk/reward favors a 2-3x move in yields if the Fed narrative shifts back toward sticky inflation and the market reprices the next cut.
• Pair trade: long XLY / short IWM for 1-3 months; large-cap growth benefits most from lower discount rates, while small caps are more exposed if the Fed is forced to stay restrictive longer.
• Add a tactical long in homebuilders (XHB or ITB) only on intraday/short-lived yield dips; stop out if the 10Y backs up above the recent range, since the trade depends on a durable policy-dovish regime.
• Sell volatility in rate-sensitive equities only via defined-risk structures, e.g., short-dated call spreads in QQQ against long puts in TLT; this captures the current dovish bias while hedging a sudden hawkish repricing.
• Avoid broad cyclicals with thin margins and high import exposure until the next inflation release cycle; if core and trimmed measures keep diverging, these names face a delayed but sharp earnings reset.