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Don’t freak out about the $40 trillion. Worry about the other number instead.
The federal debt crossed $40 trillion and the headlines arrived on cue—alarm, graphs that climb forever, comparisons to Obama-era levels that have roughly doubled in less than a decade. The reaction is understandable. A number that large feels existential. Yet the more useful response is not panic but proportion.
Household net worth in the United States sits near $180 trillion. That figure—assets minus household liabilities—dwarfs the official debt. When the government runs a deficit, the money does not vanish into a black hole. It largely appears in household checking accounts, balance sheets, and asset prices. During the pandemic years, federal debt rose by roughly $8 trillion while household net worth climbed by about $30 trillion. The mechanism is straightforward: deficit spending injects deposits; higher debt levels and easier credit push up the prices of stocks and real estate. The same process that expands public debt simultaneously expands private wealth, at least on paper.
This is not an argument for infinite deficits. It is an argument for looking at the full balance sheet. The more consequential number is private debt—currently around $45 trillion and larger than the federal total. Private debt is harder to see. There is no Times Square ticker for bank loans and household borrowing. Commercial databases and obscure Fed tables are required. Yet private debt has repeatedly proven more decisive for economic outcomes than government borrowing. Banking crises across two centuries in the major economies share a common pattern: rapid, poorly underwritten private credit growth. The 2008 episode was textbook—mortgage debt doubling from $5 trillion to $10–11 trillion in a few years, often with little or no equity and weak income verification. Conventional economic models that omitted private debt as a central variable missed the cliff entirely.
Most money itself is created this way. Roughly 90 percent of the deposit money supply is generated when commercial banks make loans. A bank marks a loan on its books and credits the borrower’s deposit account; that deposit is newly created money. The remaining share comes from the central bank. This process has operated in essentially the same form since the late seventeenth and eighteenth centuries, whether or not a formal gold standard was temporarily in force. Gold standards were never continuous; they were suspended when inconvenient. Economies that cannot expand the money supply tend to stagnate. England’s late-seventeenth-century experience, culminating in the Bank of England, is the classic illustration. Finite money supplies, including the hard-cap design of Bitcoin, collide with the same growth requirement.
Because new money enters through lending and asset markets, the distributional consequences are structural. The top 10 percent of households own the large majority of stocks and real estate. The bottom half own very little of either. When debt expands and asset prices rise, the already-wealthy capture most of the gains. This is a modern version of the Cantillon effect: those closest to the new money benefit first. The result is a K-shaped pattern that the Federal Reserve’s own distributional data make visible quarter after quarter. Middle- and lower-income groups, particularly men with only a high-school education, have seen real incomes stagnate or decline even as aggregate wealth figures look robust. Housing illustrates the same dynamic. Credit availability bids up existing homes; chronic under-supply (roughly 1.5 million homes for sale versus a healthier 2 million) keeps prices elevated. The post-2008 caution of builders and lenders has left the market short, the opposite of the 4-million-unit overhang that preceded the last crash.
Modern Monetary Theory correctly notes that a currency-issuing government faces different constraints from a household, yet it often underweights private debt and the inequality channel. Unconstrained public spending that further inflates asset prices simply widens the social divide already visible in the data. The same caution applies to claims that foreign holders, particularly China, can “call in” the debt. China’s holdings are a small fraction of the total—on the order of $700–800 billion—and arise largely from the trade surplus rather than strategic leverage. Historical precedent, including Hamilton’s observation that foreign creditors have an interest in the debtor’s success, still applies.
Financial crises are not primarily the product of exotic securitization or shadow-banking complexity, though both appear. The deeper driver is over-exuberant lending itself—human nature applied to institutions that can create money. After 2008, tighter pressure simply shifted leveraged lending into private equity and private credit. Aggregate private debt relative to GDP has not exploded; the locus of risk has moved. Shadow banking is less about illicit finance than about credit creation outside the regulated perimeter.
Technology follows a similar pattern of short-term excess and long-term underestimation. The late-1990s fiber and internet boom produced a 75 percent Nasdaq decline and widespread corporate failure, yet GDP continued to grow and the unused capacity later proved valuable. AI investment today shows comparable exuberance. History suggests corrections will occur; it also suggests the technology will remain and that net job creation, not permanent displacement, is the more likely long-run outcome. Radiology’s experience with AI is instructive: predictions of obsolescence gave way to higher volumes, more radiologists, and lower costs. New categories of work—personalized services, novel analysis, creative applications—tend to appear. Disruption is real and will require deliberate policy for retraining and transition; apocalypse is not.
The deeper historical continuity is striking. Early American bankers such as Thomas Willing operated with instruments and ambitions recognizable today. Perpetual contracts, leveraged real-estate finance, and sophisticated credit arrangements predate modern computers by centuries. The political fault line of that era—coastal commercial elites versus interior settlers and artisans—also has contemporary echoes. Division was intense; compromise and institutional construction still occurred.
The practical implication is not that public debt is irrelevant or that deficits can expand without limit. Interest costs, demographic pressures on entitlements, and the quality of public spending matter. The larger point is diagnostic. The $40 trillion figure is the visible, politically salient number. The private-debt stock, the distribution of asset ownership, the housing shortage, and the repeated tendency of credit to outrun productive use are the variables that have historically determined outcomes. Focusing exclusively on the federal total produces the wrong emotional priority and the wrong policy target. Context is not complacency; it is the minimum requirement for seriousness.