Thirty-year government bond yields across the world's major economies have climbed between 45 and 79 basis points in the first eight months of 2026. The move is not confined to the United States, even though much of the commentary has focused on Washington's fiscal trajectory and the Federal Reserve's independence under President Donald Trump's second administration. Germany, France, Italy, the United Kingdom and Japan have all seen comparable sell-offs. The explanation matters: if investors are losing faith in American institutions, that is one kind of problem. If long-term capital has simply become more expensive everywhere, that is a different one, with consequences for every government, company and household that borrows.
Not an inflation story
The numbers tell a clear story about what is not happening. Between late February and the end of August 2026, real yields on inflation-linked bonds rose by 60 basis points in the US, 58 in the UK, 56 in Japan, 34 in Germany and 35 in Australia. Breakeven inflation, which captures expected price growth plus a risk premium, moved up by smaller amounts: 16 basis points in the US, 43 in the UK, 28 in Germany, 25 in Japan, 9 in Australia. In every market where the decomposition is available, real yields accounted for more than half the increase in nominal yields. The energy shock that followed the US-Iran conflict from late February has pushed near-term inflation expectations higher, particularly in energy-importing economies such as Germany, Japan and the UK. But the dominant force is the rise in real rates.
A global repricing, not an American flight
If the sell-off reflected deteriorating confidence in US fiscal management or the Federal Reserve's autonomy, one would expect American yields to have moved disproportionately relative to peers. They did not. Over the six months to 28 August, the US 30-year yield rose 58 basis points. France rose 79. The UK and Japan both exceeded the US increase. Ranked against weekly data going back to 2006, the American move sits well above average but below the shifts recorded in several European markets and Japan.
The dollar has not persistently weakened when US long yields have risen relative to other major economies, which is difficult to reconcile with a story about investors fleeing US assets. Swap rates, which strip out sovereign-specific credit risk, tell a similar story. Thirty-year swap rates rose almost as much as government bond yields in the US, the euro area, the UK and Japan, while the spread between US investment-grade corporate bonds and Treasuries barely changed. What is becoming more expensive is long-term capital itself, not the credit of any single government.
Investment demand meets debt supply
Two forces are pushing in the same direction. The first is stronger demand for capital. Optimism about artificial intelligence is driving US investment and consumption before productivity gains materialise, as Ricardo Caballero of the National Bureau of Economic Research has argued. Defence spending, energy security investments and infrastructure programmes are adding to capital demand in Europe and elsewhere. Stephen Miran, who chaired the US Council of Economic Advisers under Trump, has characterised higher real rates as principally a signal of stronger growth potential. That claim goes further than the evidence can establish, but the direction is plausible for the US.
The second force is the sheer volume of long-dated debt that price-sensitive private investors must now absorb. Central banks, which bought bonds regardless of yield during the quantitative easing era, are running down their holdings. Foreign official investors account for a shrinking share of the US Treasury market. The Eurosystem's sovereign bond portfolio is declining just as euro-area governments are issuing more debt. Dutch pension reform is expected to reduce demand for very long-dated bonds and interest-rate swaps. Large American technology companies have been issuing long-dated euro-denominated debt, adding to the supply that European investors must digest.
Europe's diverging spreads
Within the euro area, the common rise in yields masks significant dispersion. Since September 2024, France's 10-year yield has risen roughly 115 basis points, with most of that move reflecting the broader increase in European rates rather than a France-specific deterioration. Even so, France's spread over swap rates has widened by 33 basis points, compared with 25 for Germany and a 30-basis-point narrowing for Italy. Measured against the Bund, France looks worse than it really is, because the Bund benchmark is itself moving.
Italy's relative improvement coincides with a credit rating upgrade and a budget deficit moving towards 2.9 per cent of output. France, by contrast, is running a deficit above 5 per cent with public debt heading towards 120 per cent of GDP. The spread story is not one of generalised European stress. It reflects genuine differences in fiscal trajectories.
The Bund's vanishing premium
For years, German government bonds traded at yields far below swap rates, reflecting the scarcity value that investors placed on the safest, most liquid collateral in the euro area. At the peak of the European Central Bank's asset purchases, 10-year Bunds traded nearly 80 basis points below swaps, as Isabel Schnabel, a member of the ECB's Executive Board, noted in 2025. By August 2026, the Bundesbank found no evidence of a remaining scarcity premium. Repo market measures confirm that collateral scarcity has eased.
The most natural reading is that the unusually large convenience yield that Bunds offered during the QE era has unwound as the ECB's holdings have fallen and the supply of German debt available to private investors has increased. The Bundesbank's August 2026 monthly report found no signs of a scarcity premium in the market. German creditworthiness has not deteriorated. The premium has simply normalised.
A parallel mechanism appears to be at work in US Treasuries. As the stock of US government debt has grown relative to demand from reserve managers and other price-insensitive buyers, the yield concession investors once accepted for holding Treasuries has diminished, particularly at longer maturities. Evidence of declining Treasury specialness in repo markets supports this interpretation. It does not follow that Treasuries have lost their safe-asset status. It means there is more safe debt to hold, and investors require a higher return to hold it.
What higher real rates mean for Europe
If the principal driver of higher long-term rates is a structural shift in the supply and demand for duration, the implications are more mundane but no less consequential than a crisis of confidence. European governments that borrowed cheaply for a decade face refinancing at significantly higher real costs. France's fiscal position, with debt approaching 120 per cent of GDP and a deficit above 5 per cent, looks considerably less sustainable at current real yields than at the near-zero rates that prevailed in 2020. Italy, despite its recent improvement, carries a debt stock that remains vulnerable to any sustained repricing.
For the European Central Bank, the repricing complicates an already difficult balance. The energy shock from the US-Iran conflict has pushed near-term inflation expectations higher in import-dependent economies, even as the broader trend in real rates reflects supply and demand for capital rather than monetary policy failure. Cutting policy rates to support growth would do little to reduce long-term borrowing costs if the term premium is being set by structural forces.
People mentioned
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Ricardo Caballero
Organisations
European Central Bank · Deutsche Bundesbank · Federal Reserve Board · National Bureau of Economic Research
