Reprogramming the Fed's Reaction Function

• July FOMC rate hike odds have fluctuated wildly: surged to 43% after U.S./Iran bombings and Strait of Hormuz closure, plunged to 10% after CPI release, now stand at 38% ahead of the meeting
• The Warsh Fed has largely eliminated forward guidance, making rate markets significantly more reactive to spot data and each economic release
• 10-year Treasury yield increases in 2026 are driven by shifting Fed policy expectations rather than fiscal sustainability concerns, marking a notable reversal from 2025

Summary

Key Development: Federal Reserve Chair Warsh's first month has introduced significant volatility in rate expectations, with July FOMC meeting hike probabilities fluctuating dramatically—from 39% post-first meeting to 10% after the latest CPI release, currently standing at 38% ahead of the upcoming meeting.

Market Drivers: Rate expectations are being whipped by competing forces: easing shelter inflation versus elevated energy prices following the Strait of Hormuz closure and resumed U.S./Iran bombings. The 10-year Treasury yield has risen in 2026, driven primarily by shifting Fed policy expectations rather than fiscal sustainability concerns—a reversal from last year's dynamics.

Policy Outlook: Sage Advisory's base case anticipates the Fed will hold rates steady at this week's meeting. However, the analysis emphasizes a fundamental shift in the "Warsh regime": with forward guidance largely absent, interest rates have become significantly more sensitive to real-time data releases and spot movements in Fed expectations.

Market Implications: The new reaction function creates two-way volatility. Favorable inflation data combined with de-escalation in the Strait of Hormuz could quickly remove upside pressure on rates and pull the yield curve lower. Investors are expected to scrutinize Warsh's press conference closely for clues about the committee's decision-making framework, even without explicit guidance.

Bottom Line: The Fed's policy approach under Warsh represents a marked departure from previous communication strategies, creating a more reactive, data-dependent environment where rate markets reprice sharply with each economic release, increasing short-term volatility for fixed income investors.