Bond markets are pricing a world in which capital is structurally expensive. Equity investors have not yet fully accepted the same verdict.
US 30-year Treasury yields hit 5.33% on 18 August 2026 — the highest since 2007, according to Yahoo Finance. Real yields, stripped of inflation expectations, are near 18-year highs at around 3%, Reuters reported. The 30-year has remained above 5% for the longest continuous stretch since the early days of the 2007 financial crisis. Everything priced against cheap money has yet to fully reckon with that.
The proximate cause is supply. Alphabet, Amazon, and Meta have collectively issued almost $220 billion in bonds so far in 2026, more than double the $108 billion they issued across the whole of 2025, according to Reuters, citing data from the London Stock Exchange Group (LSEG). The three technology companies are borrowing at scale to fund data-centre and artificial-intelligence infrastructure. They are doing so into a market already heavy with government paper. Investors are demanding more yield to absorb the volume.
Earlier in August, the US Treasury paid 5.22% at its 30-year bond auction — the highest cost at that maturity since 2001. US 10-year yields have reached around 4.74%, with 5% now in focus for markets.
The pressure is not confined to the United States. Japan's 10-year borrowing costs have approached a three-decade high of just under 3%, with markets pricing a potential rate rise as early as September. Germany's 10-year Bund yield has touched its highest level since 2011. France's equivalent has reached its highest since 2009. In Britain, the Debt Management Office sold gilts at a yield of 5.155% — the highest since just before the lender Northern Rock collapsed in 2007 — and UK 30-year borrowing costs have neared peaks last seen in 1998.
The research firm Capital Economics noted that the sharpest rises in long-term borrowing costs have been concentrated in the US, UK, France, Italy, and Japan — the economies where the fiscal outlook is most problematic.
Oil is amplifying the anxiety. Crude has risen 50% in 2026 so far and moved back above $90 a barrel as hopes for a US-Iran peace deal faded, renewing fears that inflation could stay higher for longer. In Britain, economists warn that inflation could approach 4% by the end of 2026, up from less than 3% currently, according to one report.
The secondary effects are accumulating. US mortgage rates have climbed to their highest levels in more than a year, tracking the rise in long-term Treasury yields. Spreads on the riskiest corporate bonds have reached a 15-month high, according to Raymond James chief investment officer Larry Adam. Margin debt hit a record $1.5 trillion in June 2026, according to data from the Financial Industry Regulatory Authority (FINRA), leaving investors running a $1 trillion net deficit with their brokers for the first time.
The risk that is least hedged is the straightforward one. Bond markets across every major economy are pricing structurally higher capital costs at every maturity. Whether central banks respond with further tightening or hold policy steady remains unclear. So does whether yields have yet reached their peak in this cycle, and how much of the AI-driven bond issuance represents durable productive investment. What the numbers already show is that the era of cheap borrowing — for governments, for technology giants, for homebuyers — is over for now, and the adjustment is far from complete.
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