Economics: How the U.S. Reduced It's Huge WWII Debt

The key thing to understand about Greece’s predicament is that it’s not just a matter of excessive debt. Greece’s public debt, at 113 percent of G.D.P., is indeed high, but other countries have dealt with similar levels of debt without crisis. For example, in 1946, the United States, having just emerged from World War II, had federal debt equal to 122 percent of G.D.P. Yet investors were relaxed, and rightly so: Over the next decade the ratio of U.S. debt to G.D.P. was cut nearly in half, easing any concerns people might have had about our ability to pay what we owed. And debt as a percentage of G.D.P. continued to fall in the decades that followed, hitting a low of 33 percent in 1981.

So how did the U.S. government manage to pay off its wartime debt? Actually, it didn’t. At the end of 1946, the federal government owed $271 billion; by the end of 1956 that figure had risen slightly, to $274 billion. The ratio of debt to G.D.P. fell not because debt went down, but because G.D.P. went up, roughly doubling in dollar terms over the course of a decade. The rise in G.D.P. in dollar terms was almost equally the result of economic growth and inflation, with both real G.D.P. and the overall level of prices rising about 40 percent from 1946 to 1956.

... implying the average rate of inflaction was about 3.5%.

See Learning From Greece by Paul Krugman, April 8, 2010.