The national deficit is the greatest threat to future generations

The claim

Deficit spending by the federal government is presented as a form of generational theft — today’s politicians spending money that tomorrow’s children and grandchildren will be forced to repay through higher taxes or reduced services. The claim draws explicitly on a household analogy: just as a family cannot indefinitely spend more than it earns, the government must eventually balance its books or face fiscal collapse. Proponents treat the national debt as a literal pile of obligations that future citizens inherit, making it a moral as well as an economic argument. The claim is invoked across the political spectrum — by Republican fiscal hawks opposing social programs, by deficit-hawk Democrats resisting spending bills, and by centrist commentators demanding “adult conversations” about entitlements.

The mechanism

The proposed mechanism runs as follows: deficit spending requires borrowing, borrowing accumulates as debt, debt requires interest payments, interest payments crowd out future spending on public goods, and the principal must eventually be repaid via higher taxes — all of which burden future generations. A secondary mechanism holds that large deficits raise interest rates, crowding out private investment and thus reducing the capital stock inherited by future workers.

Both mechanisms have real-world operating conditions, but neither holds universally, and the conditions under which they fail are precisely the conditions of the modern United States. The household analogy fails at the most basic level: a household cannot print the currency in which its debts are denominated, cannot set its own interest rates, and cannot grow its income by spending more. A sovereign currency issuer — the US, UK, Japan, Canada — faces none of these constraints in the same form. The US government’s “debt” to domestic holders is, in accounting identity, a financial asset held by the private sector. Paying it down does not free up resources; it extinguishes them.

The crowding-out mechanism is real under specific conditions — high inflation, full employment, fixed exchange rates — but has been largely absent in the post-2008 environment where zero or near-zero interest rates persisted for over a decade while large deficits coexisted with stagnant private investment, not crowded-out investment.

The evidence

The household analogy is a category error

Stephanie Kelton’s synthesis of Modern Monetary Theory in The Deficit Myth (2020) popularized a point that had been standard in post-Keynesian economics for decades: the US federal government is the monopoly issuer of the US dollar. It does not fund spending by collecting taxes or borrowing first; it creates spending capacity by crediting accounts. Taxes serve macroeconomic functions — demand management, inflation control, behavioral incentives — not revenue collection for a currency issuer. This is not fringe economics; it is consistent with how the Federal Reserve and Treasury operationally describe the payment system. The implication is that the federal government cannot become insolvent in dollars the way a household can, and the intergenerational transfer framing misidentifies what the “burden” actually consists of.

Japan as a natural experiment

Japan’s gross debt-to-GDP ratio exceeded 260% by 2023, more than double the US ratio and roughly three times the level at which Reinhart and Rogoff predicted growth collapse. Japan has run persistent primary deficits for over three decades. Its 10-year government bond yield remained below 1% through most of this period. Inflation was consistently below target, not above it. The Japanese case does not prove deficits are costless — Japan’s stagnation has other causes — but it decisively falsifies the claim that debt at these levels produces the intergenerational crisis the household analogy predicts. Germany and France, with debt-to-GDP ratios in the 60-120% range, have not experienced the predicted crowding out or collapse.

The Reinhart-Rogoff debunking

One of the most-cited empirical pillars of deficit alarmism was Reinhart and Rogoff’s 2010 finding that countries with debt above 90% of GDP experience sharply lower growth. This finding was subsequently shown by Herndon, Ash, and Pollin (2014) to rest on a spreadsheet coding error, selective exclusion of data points (including high-debt, high-growth periods in Australia, Canada, and New Zealand), and an unusual weighting scheme. When corrected, the relationship between debt and growth was modest and not discontinuous at 90%. This does not mean debt has no costs, but the specific threshold that anchored a decade of austerity advocacy was an artifact of methodology, not economic reality.

The r < g condition

Olivier Blanchard’s 2019 AEA presidential address formalized a condition that undermines the automatic-burden framing: when the interest rate on government debt (r) is below the economic growth rate (g), a government can sustain primary deficits indefinitely without increasing the debt-to-GDP ratio. This condition — r < g — has held in the United States for most of the post-war period and persistently since 2008. Blanchard’s point is not that debt is free, but that the conditions required to make it a true intergenerational burden are not always present, and policymakers who treat every deficit as crisis-level debt-service are systematically miscalibrating.

Austerity as the actual burden

The post-2010 austerity programmes in Greece, Spain, Portugal, and the United Kingdom — explicitly motivated by deficit-reduction arguments — worsened debt-to-GDP ratios by suppressing the denominator faster than the numerator. UK austerity cut public services, raised child poverty, and left infrastructure deteriorated. Germany’s constitutional Schuldenbremse (debt brake), long held up as a model of fiscal virtue, has been abandoned in 2024 under its own weight — its suppression of infrastructure investment produced crumbling bridges, underequipped schools, and a military the country is now emergency-rebuilding. The intergenerational burden of underinvestment is concrete and measurable; the intergenerational burden of manageable deficit spending is largely theoretical.

Inequality as the larger intergenerational burden

The claim focuses on government debt while largely ignoring private intergenerational transfers of wealth. The top 1% of US households holds more wealth than the entire bottom 60% combined. This concentration compounds across generations through inheritance, capital income, and preferential tax treatment. Children born into the bottom quintile have roughly an 8% chance of reaching the top quintile (Chetty et al., 2014) — a structural rigidity that is not improved by deficit reduction and is worsened by the spending cuts deficit alarmism motivates. The deficit claim implicitly treats government liabilities as uniquely burdensome while ignoring private wealth extraction as a competing intergenerational harm.

Who benefits

The deficit-as-crisis framing benefits several overlapping constituencies. Bond investors and financial institutions — particularly the Peter G. Peterson Foundation, funded by the Blackstone co-founder — have invested hundreds of millions of dollars in deficit alarmism since the 1980s. Peterson-funded organizations include the Committee for a Responsible Federal Budget, the Concord Coalition, and the Fiscal Times. These organizations frame deficit reduction as bipartisan common sense while opposing deficit spending on social programs that would compete with private financial products (Social Security privatization, Medicare market expansion). Austerity advocacy also serves employers who benefit from the wage suppression that accompanies high unemployment — which fiscal tightening tends to produce — as documented in Kalecki’s foundational 1943 essay on the political aspects of full employment. The deficit framing is structurally useful to any political coalition that wants to cut social programs without appearing to oppose the programs on their merits.

The counter

The case for deficit concern is not baseless. Interest payments on the US national debt have risen significantly as rates normalized post-2022, consuming a growing share of the federal budget and leaving less room for discretionary spending. This is a real fiscal constraint, not a theoretical one. At very high debt levels, if r rises permanently above g — as some economists argued it would — the dynamics become genuinely unsustainable. The inflation surge of 2021-2023 demonstrated that money-financed deficits combined with supply shocks can produce real price increases that harm lower-income households most, a point MMT proponents underweighted. Foreign-currency-denominated debt and fixed-exchange-rate regimes create genuine solvency risk, which is why the lessons from Japan or the US do not automatically apply to emerging market economies. Reinhart and Rogoff’s corrected results still show some negative relationship between high debt and growth, even if not the cliff edge they originally reported. A measured version of the claim — that the composition of deficit spending matters, that interest rate conditions determine sustainability, and that long-run fiscal balance has value — is supportable. The catastrophist, moralist, household-analogy version is not.

References

Blanchard, O. (2019). Public debt and low interest rates. American Economic Review, 109(4), 1197-1229. https://doi.org/10.1257/aer.109.4.1197

Chetty, R., Hendren, N., Kline, P., & Saez, E. (2014). Where is the land of opportunity? The geography of intergenerational mobility in the United States. Quarterly Journal of Economics, 129(4), 1553-1623. https://doi.org/10.1093/qje/qju022

Congressional Budget Office. (2021). The economic effects of the American Jobs Plan. US Congress. https://www.cbo.gov/publication/57280

Herndon, T., Ash, M., & Pollin, R. (2014). Does high public debt consistently stifle economic growth? A critique of Reinhart and Rogoff. Cambridge Journal of Economics, 38(2), 257-279. https://doi.org/10.1093/cje/bet075

IMF. (2023). World Economic Outlook: A rocky recovery. International Monetary Fund. https://www.imf.org/en/Publications/WEO

Kalecki, M. (1943). Political aspects of full employment. Political Quarterly, 14(4), 322-330. https://doi.org/10.1111/j.1467-923X.1943.tb01016.x

Kelton, S. (2020). The deficit myth: Modern monetary theory and the birth of the people’s economy. PublicAffairs.

Reinhart, C. M., & Rogoff, K. S. (2010). Growth in a time of debt. American Economic Review: Papers & Proceedings, 100(2), 573-578. https://doi.org/10.1257/aer.100.2.573

UNICEF Office of Research. (2023). Report Card 18: Child poverty in the midst of wealth. UNICEF Innocenti. https://www.unicef-irc.org/publications/pdf/Report-Card-18.pdf

Wray, L. R. (2015). Modern money theory: A primer on macroeconomics for sovereign monetary systems (2nd ed.). Palgrave Macmillan. https://doi.org/10.1057/9781137539922