Yields on the 30-year U.S. Treasury and government bonds across the world rose to multiyear highs as investors fret about inflation, deficits and A.I. spending. The bond sell-off has sent borrowing costs to their highest level since 2007, reflecting deepening concerns about fiscal sustainability and monetary policy.

Global fixed-income markets experienced broad-based selling pressure, with long-term yields climbing across major economies. The surge in 30-year rates signals expectations for persistently higher interest rates and elevated term premiums.

Analysts attribute the move to a confluence of factors: stubborn inflation data, expanding government deficits, and massive capital expenditure plans for artificial intelligence infrastructure. These forces have overwhelmed traditional safe-haven demand for sovereign debt.

Central banks face a delicate balancing act as rising yields tighten financial conditions independently of policy rates. The 2007 peak comparison underscores the magnitude of the shift, occurring just before the global financial crisis. Market participants now watch for signs of stabilization or further deterioration in bond market functioning.