How much deficit reduction is needed to stabilize the debt ratio?
Core argument: Congress on average did not respond to projected deficits during 2004–2024, ending the year-to-year fiscal feedback found for 1984–2003, when rising projected deficits were met with outlay reductions and tax increases.
Previous work found that Congress reduced the deficit during 1984-2003 when projected deficits rose; [e.g.] in the first period of 1991 the projected five-year surplus averaged −3.4% of potential GDP, and Congress enacted outlay reductions and tax increases of similar magnitudes that cumulatively increased the weighted surplus over the five-year window by 0.8% of GDP. We find that this year-to-year feedback has disappeared: Congress on average during 2004-2024 did not respond to the projected deficit. With large transitory deficit shocks like the COVID-19 pandemic and persistent interest rate shocks, keeping the debt ratio below 250% with 95% probability requires strong gradual feedback – 0.5%-1.2% of GDP average deficit reduction in the next decade – though less strong than actually observed during 1984-2003. [Alternatively], successful sudden feedback requires being able to undertake 1.5%-of-GDP deficit reductions twice in twelve-year periods, suggesting that a “wait-and-see” approach to successful deficit reduction sometimes allows little waiting.



