US Debt Reduction Driven by Distortions, Not Growth
New research indicates that economic growth accounted for only 22 percentage points of the US debt reduction between 1946 and 1974. Primary surpluses and interest rate distortions were the dominant drivers of the decline.
The United States reduced its federal debt-to-GDP ratio from over 100 percent in 1946 to 23 percent by 1974. A new study challenges the common belief that this decline was primarily driven by economic outpacing interest rates.
Researchers Julien Acalin and Laurence Ball argue that historical contingencies, not natural economic tendencies, drove the reduction. They identify primary surpluses and interest rate distortions as the key factors behind the shift.
Primary Surpluses Accounted For 30 Points
The government generated primary surpluses by imposing taxes higher than spending. These surpluses contributed approximately 30 percentage points to the overall decline in the debt ratio.
This fiscal strategy directly reduced the nominal value of the outstanding debt. It represented a deliberate policy choice rather than a passive economic outcome.
Interest Rate Distortions Reduced Debt by 40 Points
Interest rate distortions accounted for roughly 40 percentage points of the reduction. This effect was larger than the impact of primary surpluses.
The Federal Reserve pegged interest rates at the Treasury’s request in 1942. Yields on Treasury bills were capped at 0.375 percent, and 30-year bond yields at 2.5 percent.
This peg lasted until the 1951 Fed-Treasury Accord. It kept financing costs artificially low during the postwar period.
Growth Alone Would Have Left Debt at 74 Percent
A counterfactual analysis shows that growth alone would have reduced the debt ratio to 74 percent by 1974. Without surpluses and distortions, the debt would have remained high.
Surprise inflation also eroded the real value of nominal debts. This factor further contributed to the decline in the debt-to-GDP ratio.
