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The 30‑year U.S. Treasury yield surged to 5.73%, a level not seen in more than two decades. This move reshapes the risk‑free benchmark that underpins virtually every quantitative model. In the following sections we explore why the yield jumped, how it alters the fundamentals of asset pricing, what it means for common factor models, and how traders can adjust their frameworks to stay ahead. The Drivers Behind the Yield Surge The long‑term Treasury rate reflects expectations of future inflation, fiscal deficits, and the supply‑demand balance for safe assets. Recent data releases showed higher core CPI numbers and a tightening fiscal stance, prompting investors to demand a larger term premium....