長期殖利率持續攀升的背後，是市場對美國財政狀況惡化的擔憂日益加劇。自2007年以來，美國國債市場從4.5兆美元膨脹至31兆美元，債務占GDP比率翻倍超過100%，年度利息支出已突破1兆美元。與此同時，超過5000億美元的人工智慧基礎設施融資湧入企業債市場，進一步加劇了對債券買家的競爭，令人聯想到1980年代「債券義警」迫使政府維持財政紀律的時代。
多位資深投資經理認為，5%以上的殖利率水準可能將持續存在，不同於過往類似的短暫飆升。知名長期債券多頭Hoisington投資管理公司已放棄其數十年來的看漲立場，而先鋒資本管理的投資組合經理指出，養老基金和保險公司等傳統30年期國債買家如今擁有更多投資選擇。彭博策略師認為，30年期國債殖利率正將5%從天花板轉變為地板，下一個目標為5.5%。
The US 30-year Treasury yield has stayed above 5% for 27 trading days in 2026, including 12 consecutive sessions, marking the longest stretch since 2007. Notably, the Federal Reserve's benchmark rate is currently 150 basis points lower than in 2007, indicating that investors are demanding significantly greater compensation for holding long-duration government debt amid concerns over rising national debt and persistent inflation.
The sustained climb in long-dated yields reflects deepening anxiety over America's deteriorating fiscal outlook. The Treasury market has swelled to $31 trillion from $4.5 trillion since 2007, with debt-to-GDP surpassing 100% and annual interest costs exceeding $1 trillion. Compounding the pressure, over $500 billion in corporate financing tied to artificial intelligence infrastructure is competing for the same pool of long-end debt buyers, drawing parallels to the 1980s-era bond vigilantes who punished fiscal excess by driving yields higher.
Leading investors believe yields above 5% may be structural rather than transient. Hoisington Investment Management, a decades-long bond bull, recently capitulated, citing larger fiscal deficits and higher capital demand. Vanguard's senior portfolio manager noted that traditional long-bond buyers such as pensions and insurers now have a wider menu of alternatives. Bloomberg strategists suggest that 5% is becoming a floor rather than a ceiling for the 30-year yield, with 5.5% as the next likely target, while money managers increasingly favor shorter maturities to limit exposure to a potential debt-induced selloff.