Inflation Cooled More Than Expected, but the Government Changed How It Measures Prices

• The Bureau of Economic Analysis implemented new estimation methods for investment advice, legal services, and computer software prices retroactive to January 2021, shaving roughly 0.3 percentage points off core inflation
• The 10-year Treasury yield reached 5.29% on September 30, 2026, hitting its highest level since 2002 despite the cooler inflation reading, while second-quarter GDP was revised up to 2.2% from 1.5%
• Rate-sensitive sectors including homebuilders, utilities, and REITs face continued pressure until bond markets reflect the softer inflation data, with the September jobs report and October 27-28 Fed meeting as key catalysts

Market Summary: August Inflation Report and Methodology Changes

Key Data Points

August core PCE inflation rose 0.2% monthly versus 0.3% expected, with the annual rate at 3.0% against forecasts of 3.3%. Headline PCE increased 0.3% monthly and 3.4% annually (below the 3.7% forecast). The three-month annualized core inflation rate hit approximately 2.0%, matching the Federal Reserve's target.

Energy prices surged 16.85% year-over-year, while food rose just 1.92%. The 10-year Treasury yield reached 5.29% on September 30, 2026, despite the cooler inflation reading.

Measurement Methodology Change

The government revised how it measures service prices for investment advice, legal services, and computer software, retroactive to January 2021. These revisions reduced core inflation by approximately 0.3 percentage points, accounting for much of the downside surprise in the August report.

Market Implications

Following the report's September 30, 2026 release, CME FedWatch odds of an October rate hike dropped sharply to 34.9% from 70.9% one week prior. However, long-term Treasury yields continued rising, and the Fed hiking debate remains active.

Second-quarter GDP growth was revised upward to 2.2% from 1.5%. September ADP private payrolls exceeded expectations at 90,000 versus 70,000 forecast. The October 27-28, 2026 Fed meeting looms, with the October 2 jobs report critical for policy direction.

Sector Impact

Rate-sensitive stocks—including homebuilders, utilities, and REITs—face continued pressure until bond markets align with PCE data. New York Fed President John Williams suggested "no need for urgency" but didn't rule out further tightening. Treasury bills currently yield 4.02% at one month, offering refuge from long-term rate volatility.