September 1st, Tokyo, 9:00 AM.
A trader, coffee in hand, paused in midair. On the screen, the yield of the Japanese ten-year government bond: 3.0%. The last time this number appeared was in 1996.
On the same day, London. The UK ten-year at 5.23%, the highest since 2008. The thirty-year at 5.9%, the first time since the late '90s. Midday in New York, the U.S. ten-year at 4.78%, touching a new high since 2007.
Within a week, some of the most crucial interest rate curves on Earth were simultaneously pinned at a "long-awaited" position. The headlines all carried the same word: sell-off. It was as if something had suddenly given way.
But it wasn't sudden at all. If you rewind the lines six months back, you'll find this has been a slow burn, so slow no one smelled the smoke.
IOUs and the Spark
What is a government bond? A promissory note from a country. What is a yield? The interest rate on this note. The longer you borrow, the higher the interest, and the lower the note's price in the market. In the bond market sell-off, no one in the world suddenly wanted these IOUs.
The spark didn't originate in New York but in the Strait of Hormuz. Starting on February 28th, this most critical global energy passageway has been semi-closed for over six months, 184 days, with only 20% of its pre-war traffic. What's been blocked isn't just oil: diesel shortages have become regional; the Gulf accounts for 46% of the global urea trade, directly impacting next season's planting; a Qatari firm supplies a third of the world's helium. This wasn't about "can't afford," it was about "can't obtain."
When you can't obtain, prices surge. Crude oil loomed above $90, up over 25% from pre-war levels. When oil prices rise, everything rises. Eurozone inflation surpasses 3%, and on June 11th, the ECB raised rates for the first time in three years, with deposit rates climbing to 2.25%. The Bank of England hints at a follow-up, while the market bets on the Bank of Japan raising to 1.25% on September 18th.
While inflation is on the rise, another line is quietly thickening: the supply of IOUs.
The U.S. national debt breaches $40 trillion, averaging $120,000 per American. In the G7, except for Germany, no country has a debt/GDP ratio below 100%. Corporations are also keen on borrowing: global corporate debt issuance hit $49 trillion in 2026, breaking records, with nearly $20 billion lent out every workday; among them, the top five AI giants alone raised $2.2 trillion just to build data centers.
With abundant supply and few buyers, who still find the rates low, the price of IOUs has been steadily declining. The spark burned for half a year, and no one smelled the smoke.
Chief Bond Trader
In this round of the market, there was a protagonist named Scott Bessent, the U.S. Treasury Secretary. The media dubbed him "America's Chief Bond Trader," and he embraced it. His job was to sell off the largest pile of IOUs in U.S. history.
On August 19, he made his move: the bond repurchase limit was doubled from $20 billion to $40 billion. The nation bought back a fraction of its IOUs. The Treasury Department took the field itself, setting a price on its own IOUs.
Here's a number worth pausing to look at. $40 billion, in the $40 trillion U.S. debt, is the seventh decimal place. Such a small amount of money, yet the market read another layer of meaning: the Treasury Department was about to "manipulate yields." The government intervened to lower interest rates, the next step being de facto money printing, a "devaluation trade," where high yields are not due to a strong economy but rather to debt and inflation, signaling it's time to buy hard assets.
Gold rose by around 10% in August, Bitcoin surged to nearly $80,000, and mining stocks climbed 33% in a month. The market gave a name to this wave of buying: "the Bessent Bid."
But Bessent couldn't hold down the yield. The 10-year Treasury yield still approached 4.75% after his intervention, unable to push the line down, only squeezing out a Bitcoin rally.
Then, the Jackson Hole wildfire turned it all around.
The Jackson Hole Wildfire
On August 28, Fed's new chair Wash spoke at Jackson Hole. He didn't beat around the bush: "Inflation is not slowing down." He pledged to reach the 2% target.
The weight of this statement had to rely on the context to be felt. Prior to this, the market's baseline expectation was "stay put, maybe even cut rates," with all global rate pricing based on this assumption. The world's most important central bank suddenly made a U-turn, even if just in words, causing a repricing of all assets. Following the speech, the market's probability of a rate hike in September surged from the margins to about two-thirds and then approached 70%.
The second match followed suit: the Middle East conflict heated up again, oil prices rose, reigniting inflation concerns.
The logic loop was complete: oil price shock → inflation resurgence → central bank shift from observation to rate hikes → higher yield demands on IOUs → compounded by unprecedented supply → price plunge. Half a year smoldering, two weeks blazing.
The direct expression of the explosion was a psychological barrier being breached in the same week. Why is the "round number barrier" important? Because the bond market operates based on references. 3%, 5%, the numbers themselves have no magic, but they have been psychological anchor points for the entire market for many years. Once the anchor is broken, stop-loss orders, algorithmic trading, passive funds all kick in, triggering a self-reinforcing sell-off until the next anchor appears.
The fundamentals didn't change in a week; it was the culmination of a year's worth of force concentratedly breaking through all references in the same week.
The current question is: the central bank is hiking rates, so what about the debt?
Central Bank Hikes Rates, Government Keeps Borrowing
Central bank rate hikes have never been meant to rescue the debt. Rate hikes are solely aimed at tackling inflation. Debt is a matter for the government; central bank governors repeatedly emphasize this, their tone growing wearier each time.
But the contradiction is indeed real, and it has a specific name: fiscal dominance. When the government borrows too much, the central bank dares not raise rates. If the central bank tolerates inflation to help the government save on interest, the market would immediately conclude "this central bank has been hijacked by the government," demanding higher inflation compensation, causing long-term rates to rise even faster. The U.S. in the 1970s is a vivid example: the central bank hesitated for a decade, resulting in double-digit inflation and interest rates.
So the central bank's logic is counterintuitive: I raise short-term rates to suppress inflation expectations, only then can there be hope for long-term rates to come down. The debt issue can only be addressed through fiscal contraction or growth, not tools in the central bank's toolbox.
The market is not buying the yield; it's about whether they trust the central bank.
The most glaring fact now is the lack of coordination: central bank hiking rates, government increasing borrowing. This crack is clearly visible on the yield curve, with the thirty-year Treasury bond dropping more severely than the two-year. What does duration mean? Simply put, the longer the debt, the more price-sensitive it is to interest rates. And the thirty-year bond is precisely that IOU most sensitive to government policy.
When there is no coordination, money will flee first.
Where the Money is Flowing
In the week before Powell's speech, the fund flows were very clear:
Outflows were from U.S. assets. U.S. stocks saw an outflow of $22.3 billion in a single week, the third largest this year; money market funds saw an outflow of $19.7 billion; high-yield bonds, energy funds were being pulled out from.
Inflows were pointing in three directions: European stocks +$7.9 billion, Asia +$4.8 billion, emerging markets seeing inflows for the 7th consecutive week, fleeing the U.S.; short-term bonds +$6.3 billion, hitting a 7-week high, opting for short over long; gold funds +$4.2 billion, hitting a 6-month high, seeking a safe haven. Note that the inflow into gold funds occurred before Powell's speech, reflecting the aftershocks of the old logic.
The data for the week following Powell's speech is not yet available. However, based on the price action, gold and emerging market bonds have fallen, the U.S. dollar has risen, and funds are flowing into cash and short-term dollar assets. Last week's "decentralization" is possibly being overshadowed by a "dollar repatriation." Confirmation will only come with next week's data. By then, the leading actor in this round of sell-off may have changed.
It's another round of rising yields. Gold rises during "fiscal rate pressure" and falls when there is "actual central bank rate hikes." By early September, gold was around $4,360, down about 20% from its peak of $5,420 on January 28.
The IOUs are piling up. Those writing IOUs are borrowing, those borrowing are choosing, central banks are hiking, and fiscal authorities are ramping up.
As for who will ultimately foot the bill, the chief bond trader says, "This is not a severe situation"; the Fed Chair says, "Inflation is not slowing down." The market has said nothing. It is simply counting.
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