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Long-term borrowing costs climbed sharply across major economies on August 18 as government debt piles and geopolitical strains prompted investors to demand higher compensation for holding bonds, Reuters reported. The 30-year U.S. Treasury yield exceeded 5 percent for the first time since 2007 while Japan’s 10-year government bond yield touched its highest level in three decades. German bund yields matched peaks last seen in 2011 and French equivalents reached levels not observed since 2008, transmitting higher costs to corporate and household borrowers while complicating central bank efforts to manage inflation.
U.S. gross national debt stood near 40 trillion dollars in mid-August, according to data compiled by the U.S. Treasury Department and the Joint Economic Committee of Congress. The Congressional Budget Office projects that debt held by the public will rise from 101 percent of gross domestic product in 2026 to 120 percent by 2036, well above the previous record set after World War II. A Wharton Budget Model assessment published in spring 2026 estimated that federal debt cannot rationally exceed roughly 210 percent of GDP without triggering unsustainable interest burdens that no feasible tax increases could cover.
Geopolitical developments, particularly tensions around Iran that have driven oil prices above 90 dollars a barrel, are amplifying inflation risks and reducing room for monetary policy easing, the Reuters analysis found. President Donald Trump’s tariff policies and international engagements have added further uncertainty to the global rate outlook. These pressures have shifted bond markets into an era where inflation and interest rate forecasts carry greater upside risks than in previous years.
Jonas Goltermann, chief markets economist at Capital Economics, told Reuters that the recent surge in yields suggests investors are losing patience with fiscal profligacy. He added that the development was entirely unsurprising because the fiscal outlook in several major economies remains problematic and politicians have shown little appetite for addressing the issue. Goltermann’s assessment aligns with broader market commentary that highlights repeated fiscal slippages as eroding investor confidence over time.
Gennadiy Goldberg, a strategist at TD Securities, characterized the pressure on bonds as a death by a thousand cuts in remarks relayed by Reuters. Guy Miller of Zurich Insurance Group noted the significance of the 10-year U.S. Treasury yield moving to 4.71 percent. Christopher Dembik at Pictet Asset Management pointed to duration as a key vulnerability in the current environment of elevated uncertainty.
Higher yields are already raising financing costs for governments, companies and households while constraining policy options for authorities worldwide, according to the Reuters dispatch. In Japan the bond rout has placed additional strain on budget planning and forced officials to consider ad hoc adjustments to issuance calendars, a follow-up Reuters report on August 19 indicated. Limited tools remain available to calm markets, leaving prime ministers and finance officials with few avenues to counteract the combined effects of domestic debt loads and external shocks.
The sell-off underscores a broader reassessment of sovereign debt sustainability at a time when advanced economies face competing demands for capital, including large-scale spending on artificial intelligence infrastructure. Reuters noted that such dynamics have left bond investors demanding greater premiums before committing to long-duration holdings. Market participants continue to monitor whether policymakers will respond with credible fiscal consolidation measures or risk further increases in borrowing costs.
