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The Day the Fed Stopped Pegging War Debt

The U.S. kept wartime borrowing cheap by putting a floor under bond prices. Ending that promise changed who got to set interest rates.

The 1951 Treasury–Fed Accord and the Price of Cheap Debt

Imagine owning a government bond you could sell at a supported price even after inflation made its interest payments look miserable. For a bondholder, that is a useful promise. For the government issuing more bonds, it is a way to keep borrowing cheap. For the central bank standing behind the price, it can become a trap: the more investors want out, the more it may have to buy.

The United States made a version of that bargain during World War II. It lasted nearly six years beyond the war, and ending it took a fight between the Treasury and the Federal Reserve. The agreement they announced on March 4, 1951, was about who would make a decision that matters every time a government borrows: when the cost of debt and the cost of living pull in opposite directions, which one does the central bank protect?

How Washington put a ceiling on borrowing costs

In April 1942, the Fed committed to holding the rate on short-term Treasury bills at three-eighths of one percent, or 0.375%. It also supported a ceiling of about 2.5% on long-term Treasury bonds. These were rates on government securities, not a blanket promise that households and businesses could borrow at the same cost.

The logic starts with a simple feature of bonds: when the price of an existing fixed-rate bond goes down, the yield to a new buyer goes up. The buyer pays less for the same stream of promised payments. To stop the yield from rising beyond a ceiling, the central bank can stand ready to buy at the price corresponding to that ceiling. The yield ceiling is, in effect, a price floor.

The arrangement offered the Treasury predictability as it raised money on a wartime scale. It also made government securities easier to sell at the supported price. But the financing cost had not vanished. The central bank had taken on an obligation whose size depended on how much debt investors were willing to hold at those yields.

The promise that mattered most when nobody wanted it

Suppose a bond yields 2.5% at the supported price, but private investors now want 4% for a comparable investment. Left alone, the bond price would fall until buyers found it attractive. With a credible ceiling, investors can instead sell at the supported price. If private buyers will not take the bonds on those terms, the central bank becomes the buyer of last resort at that price.

This changes what the central bank controls. It can insist on the price, but it cannot also decide independently how many bonds it will need to buy to defend it. When the Fed bought securities, it paid by creating bank reserves. That did not mean every new dollar of reserves immediately became a dollar of consumer spending. It did mean that the Fed's balance sheet and the supply of reserves could move in response to sellers rather than to the Fed's assessment of what the economy needed.

The peg also changed investors' incentives before any purchase took place. If traders believed the floor would hold, they had less reason to fear a price decline while they owned the bond. The difficulty arose when the commitment came under pressure: the promise was most useful to sellers at precisely the moment it was most expensive for the central bank to honor.

Peace did not end the argument

The Treasury still had a large debt to manage after World War II. Higher yields could mean higher interest costs on new borrowing and on debt as it was refinanced. They could also bring losses for investors selling existing bonds. Those were real concerns, not simply an excuse to interfere with the Fed.

The Fed faced a different problem. The Korean War began in 1950, and inflation pressure intensified. If the Fed tried to restrain credit while continuing to support government bond prices, the two commitments could work against one another. Higher market rates would give investors a reason to sell the supported bonds, leaving the Fed buying securities while it wanted tighter conditions.

The issue was not whether the government should borrow or whether the Fed should ever buy its bonds. It was whether one institution's need to issue debt cheaply should determine the other's response to inflation. Once the two goals diverged, the wartime arrangement no longer offered a way to pursue both.

What the Accord did—and what it didn't

The March 1951 agreement gave the Fed room to move away from its obligation to peg Treasury yields. The transition involved compromise, including temporary support for certain securities. The shift was in operating practice: the Fed had legal powers before the Accord, but the wartime commitment had limited its practical freedom to use them. The Accord did not create the modern central bank overnight, and it did not end coordination with the Treasury.

Nor does it follow that every central-bank purchase of government debt is fiscal dominance. The distinction is who controls the objective and the exit. A central bank might buy bonds to ease financial conditions or restore market functioning and then stop when the policy goal no longer warrants it. Under a standing yield cap, the quantity of purchases can instead be dictated by the promise to defend a price. And even a yield cap need not be imposed for fiscal reasons: the Bank of Japan used yield curve control as part of its own monetary easing framework and moved away from that framework in March 2024.

Follow the obligation, not just the rate

A useful test of any policy that makes funding look cheap is to ask what happens when investors stop accepting the quoted price. Who buys then? How does that buyer fund the purchase? And who can end the arrangement if conditions change? Those questions tell a treasury desk, lender, or investor more than the headline yield alone.

They also clarify what to stress-test. The government's debt service need not reprice all at once; the maturity schedule determines how quickly higher rates feed into the budget. A bondholder, by contrast, can see the market value of an existing position fall immediately, even though its coupon has not changed. The same rise in yields runs on two clocks: one for the government's cash costs, another for the investor's balance sheet.

The wartime peg made the price of borrowing predictable by making the central bank's obligation less predictable. The Accord changed which uncertainty Washington was willing to live with. After 1951, the Treasury could still borrow. It could no longer count on the Fed to make the market accept a particular price.

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Page Last Updated: 12-Nov-2026 (3193028)