Global Bond Rout Puts Debt Sustainability at Forefront, Overshadowing AI Optimism

A global bond selloff has pushed yields to their highest levels in two decades, shifting investor focus from the AI boom to concerns about unsustainable government debt. Economists note that markets have finally lost patience with rising deficits and interest costs, despite the U.S. dollar's reserve status. The Treasury's plan to increase bond buybacks only briefly eased pressure, as doubts persist about financial engineering's ability to stem the tide.

The selloff spans major economies, with yields climbing in the U.K., France, Germany, and Japan alongside the U.S. Governments have continued crisis-era spending habits even as borrowing costs rose sharply, while AI infrastructure spending by hyperscalers now competes directly with Treasury issuance for bond market capital. Rising oil prices, driven by U.S.-Iran tensions, have compounded inflationary pressure, and Fed Chairman Kevin Warsh's refusal to offer forward guidance has added further uncertainty.

Economists point to bipartisan economic populism—spending from the left, tax cuts from the right—as a structural driver, with both approaches tolerating higher inflation and resisting central bank restraint. Analysts at Capital Economics argue the higher term premium investors now demand is fundamentally warranted, given little sign governments will curb deficits. The Treasury's buyback announcement provided only temporary relief, as markets doubt financial engineering can address the underlying fiscal trajectory.