This Is Probably Fine!
Government debt markets across the developed world are flashing warning signs that haven't been seen in decades. Thirty-year US Treasury yields have hit 5.2%, their highest level since the eve of the 2008 financial crisis, while the UK, Japan, and Germany face similar spikes in borrowing costs. The immediate catalyst is geopolitical—the closure of the Strait of Hormuz has pushed oil and inflation sharply higher—but the deeper tension is whether the era of cheap money is permanently over. Central bankers face an impossible choice: raise rates to fight inflation and risk making national debts unpayable, or hold steady and watch inflation entrench itself. Meanwhile, politicians who spent forty years taking credit for low inflation now confront the uncomfortable reality that demographics, not their brilliance, did most of the work.
Puntos clave
Long-term government borrowing costs have surged globally—US 30-year yields reached 5.2%, UK gilts 5.5%, and Japan's 20-year bonds 3.6%—driven by inflation from oil shocks and a fundamental repricing of sovereign risk.
Central banks face «fiscal dominance»: with US debt at 101% of GDP and interest payments exceeding defense spending, aggressive rate hikes to fight inflation could make national debts unpayable, effectively ending central bank independence in practice.
The AI infrastructure boom is being financed largely through private credit with floating rates, creating hidden leverage that bypasses traditional banking and means higher Fed rates automatically increase costs for the very companies holding up equity markets.
Demographics have reversed: the forty-year disinflationary tailwind from a surging global workforce and China's manufacturing rise is gone, replaced by aging populations and supply chain fragmentation that push inflation structurally higher.
The US retains structural advantages—the dollar is still the reserve currency and the Treasury market remains the world's deepest—but investors are no longer willing to lend long-term at historically low rates, signaling a long grinding repricing rather than collapse.
En resumen
The forty-year era of falling interest rates and essentially free government borrowing has ended, and what replaces it is a grinding repricing driven by aging populations, supply chain fragmentation, and debts too large to be ignored—central bank independence is now the only structural defense between managed adjustment and something considerably less orderly.
The Danger Zone
Long-term government borrowing costs have spiked globally to levels unseen in decades.
The Inflationary Catalyst
Oil shocks from Middle East conflict have pushed inflation sharply higher across advanced economies.
The closure of the Strait of Hormuz, through which roughly a fifth of global oil supply normally travels, has pushed fuel prices sharply higher, which in turn has driven up costs for pretty much everything that moves on a truck—which is most things. US gasoline is now $4.51 a gallon, while diesel is close to record levels. The inflation data has duly followed: US CPI rose to 3.8% in April, while the producer price index came in at 6%, its highest reading since the energy shock of late 2022.
Bond investors have always had what the industry describes as a complicated relationship with inflation, though the technical term is hatred. If you lend someone money for thirty years and they spend the intervening period printing a lot of it, you're not going to be happy. Markets are increasingly waking up to the idea that the era of essentially free money is probably over. Trade friction, supply chain disruption, and populations aging faster than governments are willing to admit are all pushing in the same inflationary direction. A recent Bank of America survey found that 62% of fund managers now expect US 30-year yields to reach 6% before the year is out, which would take us back to 1999.
When Presidents Attack Central Bankers
Historical conflicts between politicians and central bankers reveal today's independence under threat.
LBJ's Wall Shove (1965) President Lyndon Johnson physically shoved Fed Chairman William McChesney Martin against a wall, shouting «Boys are dying in Vietnam and Bill Martin doesn't care» after Martin raised rates during war spending.
Nixon's Inflation Gambit (1972) Richard Nixon pressured Fed Chairman Arthur Burns into keeping rates artificially low before the 1972 election. The strategy worked for Nixon's reelection but ignited a decade of catastrophic double-digit inflation, earning Burns the reputation as the worst Fed chair in history.
Volcker's 20% Solution (1980s) Paul Volcker hiked the federal funds rate to 20% to break inflation, causing a severe recession and prompting angry homebuilders to mail 2x4s to the Federal Reserve in protest. He ignored Reagan's chief of staff's order not to raise rates before the 1984 election.
Warsh's Impossible Brief (2025) New Fed Chairman Kevin Warsh inherits a debt-to-GDP ratio of 101%—more than three times what Volcker started with—alongside a war in Iran, tariffs, and a president who called the previous chairman «a total stiff.»
Fiscal Dominance
Central banks lose independence when government debt becomes too large to afford higher rates.
Fiscal Dominance
When Volcker hiked rates to 20% in the early 1980s, US national debt was roughly 30% of GDP—the treatment was painful, but the government could still afford the interest bill. Today, the Congressional Budget Office projects American public debt will climb from 101% of GDP now to 120% by 2036. If a central bank hikes rates aggressively when a government is carrying this level of debt, the interest payments alone can blow up the national budget. Economists call this «fiscal dominance»: the point at which a government owes so much that the central bank effectively loses its independence in practice, because raising rates enough to cure inflation would simultaneously make the national debt unpayable.
Britain's Cautionary Tales
The Demographic Accident
Central bankers took credit for low inflation that demographics and China actually delivered.
Pradan and Goodhart's new book «The Unanchored Central Banker» suggests that central bankers have essentially spent the last few decades taking credit for a demographic accident. For roughly forty years, a massive surge in the global working-age population combined with China's emergence as the world's factory floor naturally kept wages and consumer prices incredibly low. Central bankers enthusiastically took credit for this, attributing stable prices to their own brilliant policy frameworks—which is a bit like a surfer taking credit for the size of the waves.
Now those demographics are reversing. Populations across the developed world are aging, and the disinflationary tailwind that made central banking look straightforward for a generation is gone. What's replacing it is considerably less convenient. Adam Posen and Peter Orszag published a paper in January forecasting that US inflation could exceed 4% by the end of this year; given that CPI is already at 3.8% in April, that forecast is looking less like a prediction and more like a weather report.
The AI Leverage Time Bomb
Off-balance-sheet AI financing creates hidden floating-rate debt just as transmission mechanisms break.
The technology companies driving the current investment boom have historically funded themselves from their own enormous cash reserves. But the scale of artificial intelligence infrastructure is now so vast that even they've been forced to borrow—and they're doing it in a way that largely bypasses the traditional banking system. Hundreds of billions of dollars in new obligations are being moved off corporate balance sheets into special-purpose vehicles funded through the private credit market, which has grown to well over a trillion dollars and uses almost exclusively floating interest rates.
Morgan Stanley estimates that between 2025 and 2028, $800 billion of private credit capital will be required to finance AI data centers globally. Meta's $30 billion deal for a single facility in Louisiana was the largest private credit transaction in history. The problem: if the Federal Reserve is forced to hold rates high to fight inflation, the interest costs on these AI projects automatically adjust upwards. The companies that borrowed to build the infrastructure supposedly generating the future earnings to justify their current valuations could find themselves under significant financial pressure at exactly the moment the broader economy is slowing.
Hegemonic Decay or Universal Repricing?
Bill Gross argues America is less safe; others note yields are rising everywhere simultaneously.
No Plausible Alternative
America retains structural advantages that give it more room than any other borrower on Earth.
No Plausible Alternative
To be genuinely clear rather than falsely reassuring, the United States is not Britain in 1976. The dollar is still the world's reserve currency, the Treasury market is still the deepest and most liquid on Earth, and there's no plausible alternative that global investors can rotate into at scale. The euro area is too fragmented, Japan is dealing with its own yield problems, and nobody is rushing to park their savings in Chinese government bonds. What we're probably watching is a long grinding repricing—not a collapse, but an adjustment. The era of essentially free government borrowing is over, and the politicians who would need to address the underlying position are broadly speaking hoping that the problem resolves itself.
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