What drives sustained reductions in government debt-to-GDP ratios?
Core argument: A debt accounting exercise finds that sustained debt reductions in developed markets are typically driven by strong primary balances and above-average growth, with inflation playing little role after 1980.
Using a debt accounting exercise, we show that periods of sustained debt reduction are typically driven by strong primary balances and above-average growth. Following 1980, inflation has played little role in debt reductions. Current fiscal projections and current market interest rates on average do not point to declines in debt-to-GDP ratios across developed markets. We estimate that market implied r - g, the difference between real interest rates and growth rates, is now positive for many countries. Japan provides an example of high debt peaceably coexisting with low interest rates. However, given current high inflation, wider deficits, and rising interest costs, we think it unlikely that we return to the era of structurally low interest rates in the US, UK, or Europe. As a result, we see the risks to term premia skewed higher as fiscal risks simmer.

