THE COMPERIO MARKET BRIEF Monthly Market Commentary September 2026 Edition Inflation: Less Heat, More Breadth Two Key Takeaways: 1. Core CPI momentum is weakening; but 2. Inflation is more widespread The inflation debate has become increasingly binary: inflation is either reaccelerating and requires additional Federal Reserve tightening, or it is steadily returning toward the Fed’s 2% target. The underlying data suggest a more complicated picture. Our decomposition of CPI into monthly “impulse,” three-month annualized “momentum,” and year-over-year “regime” measures shows…