Warsh has been clear about his goal. "We're going to deliver 2% inflation and not a whisper more," he said. But the part that got everyone's attention was what came next: "I'm looking at a broader set of inflation data than PCE."
The PCE, or personal consumption expenditures price index, is the Fed's usual yardstick. It rose 3.7% in June compared to a year earlier. The more familiar CPI - consumer price index - ran at 3.5% over the same period. Both are well above the Fed's 2% target, and have been for five years.
Warsh said the Fed is sticking with PCE for now. But then he added a line that gave markets pause: "Who knows, come after next January, what we might say about strategy."
Investors do not like surprises about how the Fed measures its own success. The market for inflation-linked Treasury bonds is roughly $2 trillion, and it sits inside a much larger $31 trillion Treasury market. When the Fed's inflation-fighting commitment suddenly looks less certain, that uncertainty has a price.
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Investors saw the 30-year breakeven rate, which reflects expected inflation through the gap between standard and inflation-protected bonds, rise the most since 2024. The five-year, five-year forward rate, which had stayed capped around 2.5% for years, started to move.
Jon Hill, who heads U.S. inflation strategy at Barclays, put it plainly: "When there's increased uncertainty or reduced conviction as to the Fed's inflation-fighting commitment, it will translate into higher term premium and higher inflation risk premium."
Not everyone thinks the concern is justified. Economists at Citigroup expect that over the next couple months, Warsh's broader set of inflation metrics will actually show no worrying acceleration. And JPMorgan's team recommended betting on higher inflation expectations using five-year swaps - a sign that at least some big Wall Street firms think inflation stays sticky.
The big question for investors is whether the Fed is really changing its target or just adjusting the way it looks at the numbers. Former Richmond Fed president Jeffrey Lacker was skeptical. He said there are really only two broad, reliable indexes - PCE and CPI - and over long stretches they say the same thing. "It's not at all obvious what they would turn to, and more importantly what criteria would guide their selection," he said.
Kathy Bostjancic, chief economist at Nationwide, put it even more directly: "Defining what inflation measures he and the Fed will be monitoring is paramount."
The bottom line: For now, the uncertainty itself is the story. If the Fed signals a softer approach to inflation, bonds could sell off and yields could rise. That would ripple into stocks, mortgages, and any loans tied to Treasury rates. On the other hand, if Warsh's broader look simply confirms that prices are cooling, markets could relax.
The safest move is to watch the inflation numbers that actually matter to your daily life - rent, gas, groceries - and keep one eye on what the Fed does next. The market is not yet sure it believes that. And that gap between words and trust is where the risk lives.
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