📊 Consumer Price Index (CPI)

To: Institutional Clients

From: Global Economics Strategy Team

Date: September 2026

Subject: CPI Analysis: Persistent Inflationary Pressure and Late-Cycle Signals

1. Executive Summary

The August 2026 CPI print confirms a troubling trajectory of price persistence, with the headline index reaching a 10-year high of 334.131. The data reveals a broad-based inflationary impulse, characterized by a significant MoM acceleration in headline prices (+0.40%) and a stark resurgence in energy and transportation costs.

The policy signal is decidedly hawkish. With Core CPI also trending upward and shelter costs remaining at the 100th percentile of the 10-year range, the "last mile" of disinflation has effectively stalled. The balance of risks has shifted toward a second-wave inflationary spike, limiting the Federal Reserve's room for monetary easing.

2. Five Main Views

• Headline Peak: CPI All Items has hit its 10-year ceiling (100th percentile) at 334.131, reflecting a YoY increase of 3.35% and a sharp MoM jump of 0.40% in August.
• Energy Volatility: Energy remains the primary volatility driver, surging 16.05% YoY (Aug '25 to Aug '26) and adding 2.10% MoM in the latest print, pushing its Z-score to +1.76$\sigma$.
• Core Persistence: Core CPI (ex Food & Energy) is not providing the relief the Fed desires, rising 0.29% MoM to 337.765, indicating that inflation is becoming embedded in non-volatile sectors.
• Shelter as a Floor: Shelter costs continue to act as a structural floor for inflation, reaching a 10-year high (430.227) with a Z-score of +1.81$\sigma$, leaving little room for the "catch-up" effect to fade.
• Transportation Rebound: Transportation costs showed a sharp late-