Between 1981 and 2020 the 10-year Treasury yield fell from about 15.8% to about 0.5%. Is the post-pandemic rise to about 5% a cyclical normalisation or the start of a secular repricing of the global cost of capital? This paper treats the thesis as a hypothesis and tests each link of the chain from globalisation reversal through investment demand, r*, inflation risk and term premia to fiscal supply and foreign demand. The term premium has clearly returned (ACM 0.89%, Kim–Wright 1.07%, San Francisco Fed 1.49%), fiscal supply is heavy and the marginal Japanese bid is weakening, but r* estimates (about 1% on the New York Fed model) are low and contested, expectations are anchored, and ageing, debt and technology could pull yields down. The floor matters more than the peak: a floor of 3.5–4.5%, against 1–2% in the 2010s, would matter even if yields never reach 7–8%. The most probable reading is a higher and more volatile range, not a straight-line bear market.
16 October 2026
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