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Scott Bessent pulled the biggest lever he’s publicly wielded as Treasury Secretary on August 19, doubling liquidity-support buybacks for longer-dated Treasuries to at least $4 billion per operation. The bond market said “thanks” and then promptly went back to panicking.
The 30-year Treasury yield had surged to 5.27% before the announcement, a level the US hadn’t seen in 19 years. Bessent’s intervention briefly pushed yields lower, but by the following day, the 30-year was already back at roughly 5.24%.
The buyback play and its limits
The new buyback program targets 10- to 30-year bonds and is set to begin on September 9. By doubling the per-operation amount, the Treasury is essentially stepping in as a larger buyer in the parts of the curve where sellers have been most aggressive.
Bessent went further than just the numbers, too. He told markets the $4 billion floor could be exceeded and referenced having a “big toolkit” at his disposal.
The core issue isn’t liquidity. It’s the sheer volume of borrowing the US government needs to sustain. Gross national debt crossed $40.05 trillion on August 19, up from $39 trillion just five months earlier in March. That’s more than a trillion dollars of new debt in less than half a year.
Why yields keep climbing
The supply side of the equation is brutal. With debt growing at this clip, the Treasury has to keep issuing enormous quantities of new bonds. More supply means lower prices and higher yields, all else being equal.
The 5.27% level on the 30-year is significant not just as a round number but as a historical marker. The last time yields were this high, the financial landscape looked fundamentally different. Housing was still booming, the iPhone didn’t exist yet, and the federal debt was a fraction of its current size.
What Bessent’s toolkit might actually contain
Bessent hasn’t specified what additional measures he’s considering. He can adjust issuance patterns, shifting more borrowing to shorter maturities where demand is stronger. He can increase buyback sizes further. He can coordinate messaging with the Federal Reserve to signal alignment.
One option that markets will be watching closely is whether the Treasury adjusts its quarterly refunding plans to tilt issuance away from longer-dated bonds. That would reduce the supply of 10-year and 30-year paper hitting the market, potentially easing some of the upward pressure on long-term yields. The trade-off is more short-term issuance, which increases rollover risk and makes the government’s borrowing costs more sensitive to near-term rate movements.
The next few weeks leading up to the September 9 start date for expanded buybacks will be a critical window. If yields continue grinding higher before the program even begins, it will raise questions about whether $4 billion per operation is remotely sufficient.
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