Why the Bond Market Sell-off Has Arrived

September 1, Tokyo, 9 AM.

A trader's hand holding a coffee is suspended in mid-air. On the screen, the yield on Japan's 10-year government bonds: 3.0%. The last time this number appeared was in 1996.

On the same day, London. The yield on the UK's 10-year bonds is 5.23%, the highest since 2008. The 30-year yield is at 5.9%, the first time since the late 1990s. In New York, during trading hours, the yield on the US 10-year bonds is 4.78%, and the 30-year bonds hit a new high since 2007.

Within a week, some of the most important interest rate curves on Earth were suddenly pinned at "long-awaited" positions. News headlines all featured the same word: sell-off. It felt as if something had suddenly collapsed.

But it was not sudden at all. If you rewind the timeline six months, you will find that this has been a slow burn, so slow that no one smelled the smoke.

IOUs and Fuses

What are government bonds? They are IOUs issued by the state. What is the yield? It is the interest rate on this IOU; the longer you borrow, the higher the interest, and the lower the price of the IOU in the market. A sell-off in the bond market means that suddenly no one wants these IOUs anymore.

The fuse did not start in New York, but in the Strait of Hormuz. Since February 28, this critical global energy passage has been partially closed for more than six months, with traffic reduced to only 20% of pre-war levels. It is not just oil that is locked up: diesel is in regional short supply; the Gulf accounts for 46% of global urea trade, directly affecting the next planting season; a Qatari company supplies one-third of the world's helium. This is not about "not being able to afford it"; it is about "not being able to buy it".

When you can't buy it, prices go up. Crude oil hovers above $90, 25% higher than pre-war levels. When oil prices rise, everything rises; inflation in the Eurozone returns to above 3%. On June 11, the European Central Bank raised interest rates for the first time in three years, with deposit rates rising to 2.25%. The Bank of England followed suit, and the market is betting that the Bank of Japan will raise rates to 1.25% on September 18.

The inflation line is rising, and another line is quietly thickening: the supply of IOUs.

The total amount of US government debt has surpassed $40 trillion, averaging $120,000 per American. Among the G7 countries, only Germany has a debt-to-GDP ratio below 100%. Corporations are also rushing to borrow money: global corporate bond issuance is projected to reach $4.9 trillion in 2026, breaking records, with nearly $20 billion borrowed each working day; among them, five AI giants alone issued $220 billion just for building data centers.

With abundant supply and fewer buyers, and buyers complaining about low yields, the price of IOUs has been on a downward trend. The fuse has been burning for six months, and no one smelled the smoke.

Chief Bond Trader

In this round of market activity, there is a main character named Scott Bessent, the US Treasury Secretary. The media has dubbed him the "bond trader in chief," a title he has embraced. His job is to sell off the largest pile of IOUs in US history.

On August 19, he took action: the limit on bond repurchases was doubled from $2 billion to $4 billion. The government is buying back some of its own IOUs. The Treasury is stepping in to support its own IOUs.

There is a number worth pausing to look at. $4 billion is the seventh decimal place in the context of the US's $40 trillion debt. With such a small amount of money, the market interpreted it differently: the Treasury is going to "manipulate yields." The government is stepping in to suppress rates, and the next step is effectively printing money. This is a "devaluation trade"; high yields are not due to a strong economy but because of debt and inflation, so it is time to buy hard assets.

Gold rose about 10% in August, Bitcoin surged to nearly $80,000, and mining stocks jumped 33% in a month. The market has dubbed this wave of buying the "Bessent Bid."

However, Bessent was unable to hold down yields. The 10-year Treasury yield still approached 4.75% after he stepped in; he could not push the line down, only managed to create a Bitcoin market.

Then, the fire at Jackson Hole turned everything around again.

The Fire at Jackson Hole

On August 28, the new Federal Reserve Chair, Waller, spoke at Jackson Hole. He did not beat around the bush: "Inflation is not slowing down." He promised to hit the 2% target.

The weight of this statement can only be understood in context. Prior to this, the market's baseline expectation was to "stay put or even possibly lower rates," and the pricing of interest rates around the world was based on this assumption. When the world's most important central bank suddenly changes direction, even if it is just verbally, all assets must be repriced accordingly. After the speech, the market's probability of a rate hike in September soared from the margins to about two-thirds, then approached 70%.

The second match followed: the Middle East conflict escalated again, oil prices rose, and inflation concerns were reinforced a second time.

The logical loop was completed: oil price shock → inflation rebound → central bank shifts from wait-and-see to rate hikes → IOUs demand higher yields → compounded by unprecedented supply → prices plummet. A slow burn over six months, an explosive fire over two weeks.

The direct manifestation of this explosion was a series of psychological thresholds being breached in the same week. Why are "round numbers" important? Because the bond market operates on reference points. 3%, 5%—the numbers themselves have no magic, but they are psychological anchors for the entire market over the years. Once an anchor breaks, stop-loss orders, algorithmic trading, and passive funds all trigger, reinforcing the sell-off until the next anchor appears.

It is not that the fundamentals changed in a week; it is that a year's worth of power concentrated and broke through all reference points in the same week.

The current question is: the central bank is raising rates, so what about the debt?

Central Bank Raises, Treasury Borrows

Central bank rate hikes are never meant to save debt. Rate hikes only target inflation. Debt is a fiscal issue, and central bank governors will repeatedly emphasize this point, their tone growing more fatigued each time.

But the contradiction is real, and it has a specific name: fiscal dominance. The government borrows too much, to the point where the central bank is afraid to raise rates. If the central bank tolerates inflation to help the government save on interest, the market will immediately judge that "this central bank is being held hostage by the treasury," and will demand higher inflation compensation, causing long-term rates to rise even faster. The United States in the 1970s is a living textbook: the central bank hesitated for ten years, resulting in double-digit inflation and double-digit interest rates.

Therefore, the central bank's logic is counterintuitive: I raise short-term rates to suppress inflation expectations, only then can long-term rates hope to come down. The debt problem can only be solved through fiscal contraction or growth; that is not in the central bank's toolbox.

What the market is buying is not yield, but whether the central bank can still be trusted.

The most glaring fact now is the lack of cooperation on both sides: the central bank is raising rates while the treasury is borrowing. This gap is clearly visible on the yield curve, with the 30-year Treasury bonds falling more severely than the 2-year bonds. What does duration mean? Simply put, the longer the debt is borrowed, the more sensitive the price is to interest rates. And the 30-year bond is the IOU most sensitive to fiscal policy.

When there is no cooperation on both sides, money will run away first.

Where is the Money Running?

In the week before Waller's speech, the flow of funds was very clear:

What flowed out was US assets. US 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 and energy funds were withdrawing.

The inflow pointed in three directions: European stocks +$7.9 billion, Asia +$4.8 billion, emerging markets saw inflows for seven consecutive weeks, fleeing the US; short-duration bonds +$6.3 billion, a seven-week high, buying short not long; gold funds +$4.2 billion, a six-month high, seeking safety. Note that the inflow into gold funds occurred before Waller's speech, a remnant of old logic.

The data for the week after Waller's speech has not yet come out. But from the price perspective, gold and emerging market bonds are falling, while the dollar is rising, indicating that funds are retreating into cash and short-term dollar assets. Last week's "diversification" may be being overshadowed by "dollar repatriation." Next week's data will confirm this. Perhaps by then, this round of sell-off will have changed its main character.

In the same round of rising yields, gold rises when "fiscal suppresses rates" and falls when "central banks truly raise rates." By early September, gold was around $4,360, down about 20% from its peak of $5,420 on January 28.

The IOUs are still thickening. Those who write IOUs are borrowing, those who lend money are being selective, the central bank is raising rates, and the treasury is ramping up.

As for who will ultimately foot the bill, the chief bond trader said, "This is not a serious situation"; the Federal Reserve Chair said, "Inflation is not slowing down." The market said nothing. It is just counting.

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