Britain's 30-year gilt yield punched through 6% on Thursday morning — a level not seen since 1998 — as a global bond sell-off accelerated on two reinforcing fears: that government deficits are becoming structurally unsustainable, and that oil-driven inflation will force central banks to keep tightening. The immediate trigger is the Middle East conflict restricting oil supply, but the underlying condition is fiscal: governments are issuing enormous volumes of debt into a market that increasingly doubts the trajectory. The damage is not confined to gilts. US 10-year Treasury yields hit their highest since 2002 on Wednesday, and Japan's 10-year yield is pressing against last month's 30-year high. Even a US inflation print that came in below forecast failed to calm markets — traders read it as insufficient to derail further Fed rate hikes given the strength of the US economy and persistent wage pressure. The dollar climbed to a three-month high on the expectation that rates stay elevated. Equity markets absorbed the shock directly. The FTSE 100 dropped 1.7% in early London trading, while Germany's Dax and France's CAC 40 each fell roughly 1.1%. Neil Wilson of Saxo UK described 'carnage in the bond market hitting stocks hard,' with investors 'running for cover.' The mechanism is straightforward: rising yields make bonds more attractive relative to equities and raise the discount rate on future corporate earnings. Mohit Kumar at Jefferies identified a critical dynamic beyond the headline numbers: a buyers' strike. Hedge funds have taken losses in the rout and lack risk appetite to buy the dip. Real-money investors — pension funds, insurers — could step in but are waiting for stability before committing capital. The result is a self-reinforcing vacuum: prices fall because buyers are absent, and buyers stay absent because prices are falling. For the UK specifically, the timing is brutal. Chancellor John Healey faces a budget later this month with borrowing costs rising across the yield curve — not just the 30-year but five- and 10-year gilts too. Every basis point increase translates directly into higher debt-servicing costs, constraining fiscal space for public spending or tax relief. The government is borrowing at rates that embed a significant inflation and risk premium. The structural picture is one of multiple governments competing for a shrinking pool of willing buyers while simultaneously running deficits that require ever-larger issuance. Oil acts as an accelerant: persistent energy inflation keeps central banks hawkish, which keeps yields elevated, which raises debt-servicing costs, which widens deficits, which requires more issuance. The feedback loop is the story. Axel Rudolph of IG noted that while a December Fed rate increase is now the focal point, the broader concern is duration: not whether rates will rise again, but how long they stay elevated. Bond markets are pricing in a regime shift from the post-2008 era of low rates and abundant liquidity to one where governments must pay meaningful real returns to attract capital. If that repricing is structural rather than cyclical, the fiscal arithmetic for every major economy changes permanently.
