1. “Budget and Economic Data: Historical Data and Economic Projections,” Congressional Budget Office, January 2019.
2. Romina Boccia, “At $23 Trillion, the U.S. National Debt Already Exceeds the Size of the U.S. Economy,” Heritage Foundation, January 31, 2020.
3. Paul Krugman, “Debt, Doomsayers and Double Standards,” New York Times, October 28, 2019.
4. Josh Bivens, “Why Is Recovery Taking So Long—and Who’s to Blame?,” Economic Policy Institute, August 11, 2016.
5. Claus Brand, Marcin Bielecki, and Adrian Penalver, eds., “The Natural Rate of Interest: Estimates, Drivers, and Challenges to Monetary Policy,” European Central Bank Occasional Paper Series no. 217, December 2018.
6. James Hamilton, Ethan Harris, Jan Hatzius, and Kenneth West, “The Equilibrium Real Funds Rate: Past, Present, and Future,” Brookings Institution, October 30, 2015.
7. Models that estimate r* generally rely on the trend growth rate as an input. See, for example, Thomas Laubach and John C. Williams, “Measuring the Natural Rate of Interest Redux,” Brookings Institution, November 2, 2015.
8. Edward Gamber and John Seliski, “The Effect of Government Debt on Interest Rates,” Congressional Budget Office Working Paper no. 2019-01, March 2019.
9. Gamber and Seliski, “The Effect of Government Debt on Interest Rates.”
10. I refer to (but modify slightly) the CBO’s projections for my baseline estimate of the future path of the debt burden. Note, however, that official forecasts of budget balance tend to have an optimistic bias. Jeffrey Frankel, “Over-optimism in Forecasts by Official Budget Agencies and Its Implications,” Oxford Review of Economic Policy 27, no. 4 (2011): 536–62.
11. The CBO estimates category-specific outlays only through 2029. See “Budget and Economic Data: Historical Data and Economic Projections.”
12. See, for example, Christina D. Romer and David H. Romer, “The Macroeconomic Effects of Tax Changes: Estimates Based on a New Measure of Fiscal Shocks,” National Bureau of Economic Research Working Paper no. 13264, July 2007; “How Taxes and Transfers Affect the Work Incentives of People with Low and Moderate Income,” Congressional Budget Office, March 17, 2017; N. Gregory Mankiw and Matthew Weinzierl, “Dynamic Scoring: A Back-of-the-Envelope Guide,” National Bureau of Economic Research Working Paper no. 11000, December 2004; and William G. Gale and Andrew A. Samwick, “Effects of Income Tax Changes on Economic Growth,” Brookings Institution, February 1, 2016.
13. Cost estimates for the 2017 Trump administration tax cuts vary quite significantly. Last year the Committee for a Responsible Federal Budget, an independent nonpartisan organization, projected that the tax cuts would cost the federal government a total of $1.8 trillion (including extra interest payments) through 2028. Repealing these tax cuts would therefore increase federal government revenue by roughly the same amount relative to the CBO’s baseline projections. Nevertheless, this paper’s projections show that doing so would only delay the 100 percent debt-to-GDP threshold by two years. For more, see: “Tax Cut and Spending Bill Could Cost $5.5 Trillion Through 2029,” Committee for a Responsible Federal Budget, February 27, 2019.
14. Although evidence suggests that deregulation of the most highly regulated industries, such as transportation and communication, can increase investment, this evidence is not necessarily generalizable. See Albert Alesina, Silvia Ardagna, Giuseppe Nicoletti, and Fabio Schiantarelli, “Regulation and Investment,” National Bureau of Economic Research Working Paper no. 9560, March 2003.
15. David E. Bloom, David Canning, and Jaypee Sevilla, “The Effect of Health on Economic Growth: Theory and Evidence,” National Bureau of Economic Research Working Paper no. 8587, November 2001; Robert G. Evans, “Waste, Economists and American Healthcare,” Healthcare Policy 9, no. 2 (November 2013): 12–20; E. S. Fisher, D. E. Wennberg, T. A. Stukel, D. J. Gottlieb, F. L. Lucas, and E. L. Pinder, “The Implications of Regional Variations in Medicare Spending. Part 2: Health Outcomes and Satisfaction with Care,” Annals of Internal Medicine, 138, no. 4 (February 2003): 288–98; and J. E. Wennberg, E. S. Fisher, and J. S. Skinner, “Geography and the Debate Over Medicare Reform,” Health Affairs, 2002, https://www.healthaffairs.org/doi/full/10.1377/hlthaff.W2.96.
16. Alberto Alesina and Francesco Giavazzi, “The Effects of Austerity: Recent Research,” National Bureau of Economic Research, NBER Reporter no. 3, 2015; Alberto Alesina, Carlo A. Favero, and Francesco Giavazzi, “Climbing Out of Debt,” Finance & Development 55, no. 1 (March 2018): 6–11. In another study of 3,500 policy changes in 16 OECD countries, Alesina et al. find that spending cuts reduce GDP slightly in the short term, but the reduction in income is smaller than the reduction in spending, so spending cuts reduce the debt-to-GDP ratio. See Alberto Alesina, Omar Barbiero, Carlo Favero, Francesco Giavazzi, and Matteo Paradisi, “The Effects of Fiscal Consolidations: Theory and Evidence,” National Bureau of Economic Research Working Paper no. 23385, May 2017.
17. See, for example, Evans, “Waste, Economists and American Healthcare”; and Linda Diem Tran, Frederick J. Zimmerman, and Jonathan E. Fielding, “Public Health and the Economy Could Be Served by Reallocating Medical Expenditures to Social Programs,” SSM Population Health 3 (December 2017): 185–91.
18. Helen Levy and David Meltzer, “The Impact of Health Insurance on Health,” Annual Review of Public Health 29 (2008): 399–409; Jonathan Skinner, Elliott S. Fisher, and John E. Wennberg, “The Efficiency of Medicare,” in Analyses in the Economics of Aging (Chicago: University of Chicago Press, 2005). One counterexample is David Card, Carlos Dobkin, and Nicole Maestas, “Does Medicare Save Lives?,” Quarterly Journal of Economics 124, no. 2 (2009): 597–636.
19. Jeffrey Miron and Laura Nicolae, “Why the US Can’t Afford a Green New Deal,” CNN Opinion, February 24, 2019.
20. See, for example, Clare Foran, “House Passes Sweeping Budget and Debt Limit Deal,” CNN Opinion, July 25, 2019; Kate Davidson, “Federal Deficits to Grow More Than Expected Over Next Decade, CBO Says,” Wall Street Journal, August 21, 2019; John McClelland and Jeffrey Werling, “How the 2017 Tax Act Affects CBO’s Projections,” Congressional Budget Office, April 20, 2018; and “Cost Estimate: H.R. 748, Middle Class Health Benefits Tax Repeal Act of 2019,” Congressional Budget Office, July 17, 2019. Trump administration officials have also claimed that the Tax Cuts and Jobs Act of 2017 would “largely pay for itself” (e.g., Larry Kudlow and Stephen Moore, “To Speed Job Growth, Cut Taxes Now,” Wall Street Journal Opinion, January 27, 2017), but most other forecasters share the CBO’s conclusions.
21. See, for example, Jason Furman and Lawrence H. Summers, “Who’s Afraid of Budget Deficits? How Washington Should End Its Debt Obsession,” Foreign Affairs, March/April 2019; Olivier Blanchard, “Public Debt and Low Interest Rates,” American Economic Review 109, no. 4 (April 2019): 1197–1229; and Paul Krugman, “Who’s Afraid of the Budget Deficit?” New York Times, January 3, 2019.
22. John Holahan and Linda J. Blumberg, “Estimating the Cost of a Single-Payer Plan,” Urban Institute, October 9, 2018.
23. Douglas Holtz-Eakin, Dan Bosch, Ben Gitis, Dan Goldbeck, and Philip Rossetti, “The Green New Deal: Scope, Scale, and Implications,” American Action Forum, February 25, 2019.
24. See, for example, Emma Brown, “GOP House Members Seek to Cut Education Budget—But Not Nearly as Deeply as Trump Proposed,” Washington Post, July 12, 2017; Richard Cowan and Susan Cornwell, “Democrats Seek to Cut U.S. Budget Deficits in Half: Yarmuth,” Reuters, January 29, 2019; and Tim Hains, “Larry Kudlow: Tax Cut Has Paid for Itself Already through Higher Tax Revenue and Growth,” Real Clear Politics, November 15, 2018.
25. See John F. Early, “Reassessing the Facts about Inequality, Poverty, and Redistribution,” Cato Institute Policy Analysis no. 839, April 24, 2018, for calculations along these lines.
26. “COVID Money Tracker,” Committee for a Responsible Federal Budget, https://www.covidmoneytracker.org/.
27. See: Alan J. Auerbach, William G. Gale, Byron Lutz, and Louise Sheiner, “Fiscal Effects of COVID-19,” Brookings Papers on Economic Activity, BPEA Conference Draft, September 2020. As this paper was being completed, I learned about this newly published report that reaches similar conclusions to mine.
28. “Weekly Updates by Select Demographic and Geographic Characteristics,” Centers for Disease Control and Prevention (CDC), National Center for Health Statistics, October 21, 2020, https://www.cdc.gov/nchs/nvss/vsrr/covid_weekly/index.htm#AgeAndSex.
29. Steve Goss and Karen Glenn, “Implications of the COVID-19 Pandemic for the US Social Security Program,” National Bureau of Economic Research Summer Institute, July 22, 2020.
30. Auerbach et al., “Fiscal Effects of COVID-19.”