Inflation Cooled to 3.4 Percent in August. Treasury Yields Hit a 24-Year High the Same Week.

The federal government's preferred inflation gauge cooled to 3.4 percent in August, matching July's rate and coming in below Wall Street's forecast of 3.7 percent. The bond market did not treat it as good news. Two days after the data landed, the 10-year Treasury yield hit 5.3338 percent, the highest level since April 2002, and the 30-year climbed to 5.6702 percent, a level last seen in July 2002.

Why the headline number improved

Part of the August improvement came from a methodology change, not from slower price growth. The Bureau of Economic Analysis revised how it tracks three service categories inside the PCE index: portfolio management and investment advisory fees, which had been extrapolated from employment headcounts rather than actual billed fees; legal services, which produced erratic readings that didn't line up with the Consumer Price Index; and computer software, where a single composite index had been blending products with very different price trends.

Economists at Goldman Sachs and JPMorgan had estimated the revision would shave 0.1 to 0.2 percentage points off core PCE. The actual drop was larger. Core PCE fell from 3.3 percent to 3.0 percent year over year, a 0.3-point move. The BEA's own release puts it plainly: the price index rose 0.3 percent for all items and 0.2 percent for core, measured month over month against July. Neither the agency nor the Fed has broken out how much of the annual improvement is the new accounting and how much is real disinflation, so the exact split is an estimate, not a certainty.

The bond market isn't buying the all-clear

Treasury yields have been climbing for months on a mix of worries that have little to do with the monthly inflation print: persistent government deficits, a Middle East conflict that has pushed oil prices higher, and a slow unwind of the yen-funded carry trade that has helped fund demand for Treasuries for years. The Institute of International Finance warned last week that major economies face what it called persistently large deficits and rising interest expenses, challenges long associated with debt-distressed emerging market sovereigns. Bloomberg data show Treasuries have lost 2.6 percent so far this year after gaining 6.3 percent last year, and this month is on pace to be the worst September for bonds since 2023.

Not everyone reads the selloff the same way. Jim Bianco, a Wall Street strategist who has been bearish on Treasuries for years, said he is turning bullish for the first time in six years. Mark Dowding, chief investment officer at RBC BlueBay Asset Management, called the selloff overdone. Prashant Newnaha, a rates strategist at TD Securities, took the opposite view. "It's been a train wreck in rates over September, and the pain trade may continue," he said, pointing to the Middle East conflict as a reason losses could extend into October.

“Regardless of whether you are in a rural or urban area, the fact remains that inflation has been too high for too long.”

What the two numbers don't settle

Cook's remarks were about rural economic conditions, not a response to the August data, and she did not address the methodology change or the bond selloff directly. That leaves two separate signals pointing in different directions this week: an inflation index built, in part, on a statistical fix, suggesting room for the Fed to ease, against a bond market pricing in persistently higher rates for longer. Both can be accurate. They measure different things. One is a backward-looking price index. The other is a forward-looking bet on deficits, oil, and Fed policy.

For anyone with a loan rate tied to the 10-year, the practical answer is the yield, not the inflation headline. Mortgage and auto financing costs are set by what bond investors demand today, and this week they demanded more than they have in 24 years. The next PCE report, due in late October, will show whether the new accounting method keeps producing softer headlines. The Treasury market, for now, is not waiting to find out.