AI capex has become a duration-and-credit test
Hyperscalers have issued more than $220 billion of investment-grade debt without widening spreads, but long-end Treasury yields have erased intervention-driven gains and Wolfe warns that higher rates could pressure debt-funded AI investment. Credit absorption still says financing is available, while heavier reliance on levered Treasury buyers makes the marginal dollar more fragile. Spreads and the 30-year yield now matter as much as capex guidance.