
This week we talk about money policies, yield curves, and government bonds.
We also discuss the Fed, the Treasury Department, and a WWII accord between them.
Recommended Book: Paved Paradise by Henry Grabar
Transcript
In April of 1942, a few months after the United States entered World War 2, the US Treasury Department asked the Federal Reserve to help it borrow a truly staggering amount of money, and as cheaply as possible. The Fed agreed, committing itself to holding short-term Treasury bill rates at three-eighths of 1%, while also capping the yield on long-term government bonds at 2.5%.
This was a type of yield curve control. Rather than allowing the market to decide how much interest the government would pay, the Fed decided that price and promised to enforce it.
That helped finance the war, because the Treasury knew its borrowing costs wouldn’t spiral out of control at a moment when it needed to spend unprecedented sums on ships, planes, weapons, soldiers, and all the other machinery of an ongoing global conflict.
The downside was that the Fed lost control of an important monetary policy lever.
Bond prices and yields move in opposite directions, so keeping yields below a certain level meant the Fed had to stand ready to buy bonds whenever their prices dropped. It couldn’t decide in advance how many it would buy, or how much money it would create in the process. The market would thus forth decide that, instead.
Consequently, the Fed became, in some ways, an extension of the Treasury’s debt-management operation, its inflation-related responsibilities made secondary to the government’s need for cheap financing.
That arrangement persisted after the war ended, despite the return of inflation, and President Harry Truman’s administration pushed to maintain it during the Korean War, as well.
Fed officials resisted, though, with inflation running at more than 8%, and after a very public, very contentious standoff, on March 4, 1951, the Treasury and the Fed announced that they had reached what became known as the Treasury-Fed Accord.
That agreement did not make the Fed independent all at once, but it established the principle underlying the modern relationship between these institutions: the Treasury manages government borrowing, while the Fed sets monetary policy based on inflation and employment, not on how much that policy costs the government.
The market, in other words, would once again be allowed to decide the price of long-term US debt.
What I’d like to talk about today is what happens when that price goes up, what’s pushing long-term US borrowing costs toward levels we haven’t seen in decades, and why two people appointed by the same president are pulling in opposite directions on this issue.
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The Federal Reserve’s primary interest-rate lever is the federal funds rate, which is the overnight rate banks charge each other to borrow money. The Fed currently targets a range of 3.5 to 3.75 percent for that rate, and while it has other tools, this is the number people are usually talking about when they say the Fed raised, cut, or held rates.
The Fed does not directly set the yield on 10- or 30-year Treasuries, though.
Those securities are sold at auction and then traded in a huge secondary market, and their yields reflect a combination of what investors expect inflation to look like, where they think short-term rates will go over the life of the bond, and what’s called the term premium.
The term premium is basically extra compensation for uncertainty. If you lock up your money for 30 years instead of rolling over short-term debt, you accept the risk that inflation, growth, government policy, and other variables will change in ways that make your bond less valuable over that thirty year period. The more uncertain the future seems, the more compensation you’re likely to demand.
And again, when demand for a bond falls, its price falls and its yield rises. When we say yields are rising, that means borrowers have to offer investors, the people and institutions giving them the money they want to borrow, more money, more interest, to convince them to buy those bonds.
That doesn’t only affect the government. The 10-year Treasury serves as something like a reference rate for the entire economy, influencing mortgages, business loans, and the value of long-lived assets.
As of September 3 of 2026, the average US 30-year fixed mortgage rate was 6.71%, up from 6.5% a year earlier. That increase is the result of yield increases in the bond market.
Long-term Treasury yields have been climbing for much of 2026, and that climb accelerated over the summer.
The 30-year yield reached about 5.31 percent on August 17, its highest level since 2007. A few days earlier, the Treasury sold 30-year bonds at a yield of 5.216%, the highest borrowing cost at one of those auctions since 2001.
The 10-year yield briefly hit about 4.81% this past week, its highest level since early 2025, and ended Friday at about 4.78%. The two-year yield, which tends to track expectations about contemporary Fed policy more closely, ended at about 4.37%.
There isn’t one clean cut reason for these yield bumps. Instead, there are a bunch of forces pushing in roughly the same direction.
The first is government borrowing. The Congressional Budget Office now expects a roughly 2.1 trillion dollar federal deficit this fiscal year, which is 200 billion dollars more than it projected in February. Covering that gap means issuing more debt, and more supply generally means the Treasury has to offer a better return to attract enough buyers.
The second is competition from corporations, especially technology companies borrowing to build AI infrastructure and data centers.
The Dallas Fed estimates that AI-related investment-grade bond issuance—these companies borrowing money, in the form of bonds, to help build more data centers and other AI-enabling stuff—could total around $300 billion this year, creating long-duration debt equivalent to about an eighth of what the Treasury is expected to issue. Some of the companies selling this debt have extremely strong balance sheets and high credit ratings, so investors who want safe-ish, long-term bonds suddenly have a lot more options, and the US government has to compete with that for a finite pool of investor resources.
Third, oil prices have surged following renewed strikes and attacks around the Strait of Hormuz, with US benchmark prices recently climbing above $90 a barrel. More expensive energy can goose inflation across the economy, which makes locking in a fixed return for 10 or 30 years less appealing, because those yields might not keep up with the practical devaluation of the dollar.
Fourth, that aforementioned term premium has risen as investors ask to be paid more for uncertainty related to inflation, deficits, geopolitics, and future Treasury issuance.
And fifth, the pool of buyers is changing. Foreign investors still own trillions of dollars in Treasuries, but private foreign demand for notes and bonds fell sharply in June, even as corporate bonds attracted more of that finite sum of money.
A big shift we seem to be seeing here is that some investors seem to be judging Treasuries less as a bet on the next Fed meeting, and more as a long-term bet on whether the US political system can manage its finances. And that shift is showing up at an awkward moment for the two institutions involved in the 1951 Accord.
Kevin Warsh, who became Fed chair in May, used his August 28 speech at Jackson Hole to say that although inflation expectations remain anchored, the Fed still has work to do if underlying inflation is not moving toward its target quickly enough.
Markets read that as a warning that a rate hike could be coming, and the unexpectedly strong August jobs report reinforced that interpretation: employers added 162,000 jobs, far more than economists anticipated, while estimates for June and July were revised upward.
The Treasury Department, meanwhile, is moving in the opposite direction.
On August 19, Treasury Secretary Scott Bessent announced that the government would at least double the size of its long-term bond buybacks, from a maximum of 2 billion dollars to at least 4 billion dollars per operation, beginning September 9 and continuing through November 4.
The stated purpose is to improve liquidity, buying older, less frequently traded 10- to 30-year securities. But buying long-term bonds also reduces the supply available to investors, boosting prices and putting downward pressure on yields, which is why Bessent has referred to the approach as a “Treasury twist.”
The scale is small in the context of a $40 trillion national debt, and analysts have described it as more signal than substance. It is nonetheless a striking signal: one Trump appointee is telling markets that higher short-term rates may be necessary to control inflation, while another is using the Treasury’s balance sheet to push long-term rates in the other direction.
These jobs, which again, were separated in 1951, are working against each other. And this matters, first, because long-term government debt is the foundation upon which a lot of other prices are built.
When a 30-year Treasury yields more than 5%, companies refinancing debt have to pay more, commercial real estate becomes harder to finance, mortgages become more expensive, and investors have less reason to pay extremely high prices for stocks based on profits those companies might earn many years from now.
It also matters because interest on the federal debt has become one of the government’s largest expenses. Gross interest expense reached about $1.17 trillion during the first ten months of fiscal 2026, up about 15% from the same period last year. The somewhat narrower CBO measure of net interest reached $963 billion over that span, roughly level with Medicare spending and greater than defense spending.
This creates a potentially self-reinforcing loop: higher yields increase the cost of servicing the debt, higher interest costs expand the deficit, larger deficits require more borrowing, and more borrowing can put further upward pressure on yields.
Economists use the term fiscal dominance to describe the point at which government financing needs start to constrain monetary policy, pushing the central bank to keep rates lower than it otherwise would, or to buy government debt, even if doing so undermines its effort to control inflation.
The US is not necessarily at that point, but this is exactly the kind of pressure the 1951 Accord was meant to prevent.
As with everything government money-related, there’s also a global dimension to this shift.
For decades, Japanese banks, insurers, pension funds, and other institutions bought foreign bonds in part because yields at home were so low. On September 1, though, Japan’s 10-year government bond yield touched 3% for the first time since 1996.
Japan’s government has more debt relative to the size of its economy than any other wealthy country, and it assumed a 3% long-term rate when calculating debt-service costs for its current budget. Rising above that level would strain its finances, but those higher yields also give Japanese investors more reason to keep their money at home.
That doesn’t mean Japanese institutions will dump all their Treasuries. Currency-hedging costs and the specific needs of different investors complicate that calculation. But when a major source of relatively steady demand becomes more price-sensitive, the marginal buyer of US debt has to be paid more to invest.
Finally, the Treasury market itself has become somewhat more fragile.
The amount of debt in circulation has grown far faster than the balance sheets of the dealers that traditionally absorb buying and selling. Hedge funds have filled some of that gap using highly leveraged strategies, including something called the cash-futures basis trade.
Fed researchers estimate that these positions reached about $830 billion by September 2025, representing 35% of hedge funds’ long Treasury exposure. These trades can provide useful liquidity when markets are calm, but because they rely on enormous amounts of borrowed money to capture tiny price differences, they can also unwind pretty quickly when volatility spikes.
That sort of unwind contributed to the Treasury-market seizure in March of 2020, and a different leveraged hedge-fund strategy added to turbulence in April of 2025.
The assets treated as the world’s safest and most liquid can still become difficult to sell when everyone needs cash at the same time, in other words.
The next few weeks should partially clarify what’s actually driving this unusual market.
The expanded Treasury buybacks begin the day after this episode goes live, September 9. Producer-price inflation data arrives on September 10, consumer-price data on September 11, and the Fed meets on September 15 and 16. The Bank of Japan follows on September 17 and 18, when it may increase its policy rate from 1% to around 1.25%.
If the Fed hikes and long-term yields fall, that could indicate investors view the move as credible inflation-fighting: short-term borrowing becomes more expensive, but the term premium shrinks because the distant future seems less inflationary.
If the Fed holds after a soft inflation report and short-term yields fall while the 30-year barely moves, that would suggest the long end is being driven by deficits, debt supply, oil prices, corporate competition, and global demand more than Fed policy.
And if the buybacks begin but long-term yields continue to climb, that would demonstrate the limits of debt-management policy in a market this large. The Treasury could respond by issuing more short-term and less long-term debt, reducing immediate borrowing costs, though that would also mean refinancing more frequently and taking on the risk that rates remain high.
It could also draw down some of the around $950 billion in its account at the Fed to fund larger buybacks, but that cash also serves as a buffer against the debt ceiling, which the government is currently expected to reach sometime in 2027. Spending the buffer now would mean rebuilding it later, and rebuilding it would require issuing even more debt.
Back in 1951, the Treasury and the Fed reached an agreement that the central bank should not be required to make government borrowing cheap, and that the price of long-term debt should be allowed to reflect what the market believed that debt was worth.
Right now, the market is rendering its verdict, and that verdict is that lending the United States money for 30 years has become substantially more expensive. Now we wait to see what Washington decides to do about it.
Show Notes
https://www.federalreservehistory.org/essays/treasury-fed-accord
https://www.brookings.edu/articles/what-is-the-treasury-fed-accord-of-1951-and-why-is-it-important/
https://www.federalreserve.gov/data/three-factor-nominal-term-structure-model.htm
https://www.freddiemac.com/pmms
https://www.cbo.gov/publication/61983
https://fiscaldata.treasury.gov/datasets/interest-expense-on-the-public-debt-outstanding/interest-expense-on-the-public-debt-outstanding
https://fiscaldata.treasury.gov/datasets/debt-to-the-penny/debt-to-the-penny
https://www.dallasfed.org/research/economics/2026/0210-searls-aifinancing
https://home.treasury.gov/news/press-releases/sb0606
https://home.treasury.gov/news/press-releases/sb0607
https://www.federalreserve.gov/newsevents/speech/warsh20260828a.htm
https://www.bls.gov/news.release/empsit.htm
https://apnews.com/article/1af16359af43eb8abc66445465f633c8
https://apnews.com/article/775d7cf741349c7c8e689c0beb57f074
https://apnews.com/article/a27a8d3651ff810b25c610d3e1b6259d
https://www.federalreserve.gov/econres/notes/feds-notes/decomposing-hedge-funds-u-s-treasury-exposures-20260622.html
https://www.imf.org/en/publications/fandd/issues/2026/03/safeguarding-the-treasury-market-jeremy-stein
https://www.investing.com/news/economy-news/japans-benchmark-bond-yield-rises-to-3-for-first-time-in-30-years-4883532
https://www.boj.or.jp/en/mopo/mpmsche_minu/index.htm
https://bipartisanpolicy.org/article/when-will-we-reach-the-debt-limit-again/
https://home.treasury.gov/policy-issues/financing-the-government/quarterly-refunding/most-recent-quarterly-refunding-documents/
https://www.federalreserve.gov/monetarypolicy/fomccalendars.htm
https://www.bls.gov/schedule/2026/09_sched.htm
https://www.axios.com/newsletters/axios-markets-a975877a-ddce-4ea0-a735-4b460d37af90.html
https://www.ft.com/content/c96c25c1-b27c-4c08-a2ba-21821b39dd78
https://www.axios.com/2026/08/19/rates-treasury-borrowing-bessent
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