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5 min readThe Bond Market's New Math: Supply, Demand, and the Limits of Intervention
At Jackson Hole, the official theme was financial innovation in payments, but the unofficial one was what's happening with bond yields. The 30-year Treasury had been trading above 5%, and the Treasury Secretary had just announced an expansion of the Treasury's buyback program—not because markets were broken, but because he seemed to think yields were simply too high. Stanford finance professor Darrell Duffie sat down with Odd Lots to explain what's really driving long-term rates and why the Treasury's ability to change them is more limited than many assume.
The Supply Problem That Won't Go Away
When Duffie looks at a 30-year yield above 5%, he doesn't start with inflation or Fed policy. He starts with a simple thought experiment: imagine you're a hedge fund already holding $20 billion of 10-year Treasuries. The Treasury calls and asks you to buy $10 billion more. Under current conditions—stable inflation expectations, no default risk—why would you say yes unless you got a higher yield?
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What you'll learn
- 1 (02:49) **Episode Setup & The Core Puzzle** - The hosts frame the Jackson Hole backdrop: long-end yields are surging, the Fed has new task forces, and the Treasury is buying back long-dated bonds, creating cross-currents.
- 2 (04:31) **The Link Between Yields and Market Plumbing** - Duffey connects the surge in yields to the sheer volume of public debt overwhelming dealer balance sheets, a structural problem he warned about after March 2020.
- 3 (05:57) **What a 5% 30-Year Yield Tells You** - Duffey explains that from the Treasury Secretary's perspective, high yields mean crippling interest expense, and the real question is what the Treasury can actually do about it.
- 4 (08:14) **Competition for Capital: Treasuries vs. Everything Else** - Duffey argues that the biggest "culprit" for higher yields is the massive and growing supply of government debt, which crowds out other assets.
- 5 (11:58) **Inflation vs. Supply: What's Really Driving Rates?** - Duffey downplays inflation as the primary driver of long-term yields, arguing that forward implied inflation numbers are not showing alarm bells.
- 6 (16:29) **Fiscal Dominance and the Fed's Dilemma** - The conversation turns to how the deluge of debt issuance constrains central bankers, even as the Fed "studiously avoids" the appearance of fiscal dominance.
- 7 (17:42) **Decoding Scott Bessent's Treasury Buyback Announcement** - Duffey analyzes the Treasury Secretary's recent move to expand buybacks, interpreting it as a signal that yields were too high, not a response to liquidity concerns.
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Show Notes
Global bond yields are at their highest level since 2008, with the 30-year US Treasury touching 5% just before Treasury Secretary Scott Bessent announced a surprise increase of his department's bond buyback program and Fed Chairman Kevin Warsh made his hawkish speech at Jackson Hole. So what's driving yields higher? And what options do policymakers have to bring them down? In this episode we speak with Stanford Professor Darrell Duffie, who's been researching bonds for years, including presenting a paper at Jackson Hole in 2023 about how to fix the US Treasury market. A lot has changed since then, and at this year's Jackson Hole symposium, we caught up with Duffie to talk about everything going on in the bond market, as well as the challenge of shrinking the Fed's balance sheet.
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