36:57

In this Marginal Revolution podcast episode, Alex Tabarrok and Tyler Cowen examine the size and sustainability of U.S. federal debt. They note that publicly held debt is about $30 trillion, roughly equal to GDP, and that interest payments at 3.4 % amount to about $1 trillion annually—comparable to defense or Medicare spending. They then broaden the picture by adding off‑budget liabilities (Social Security ~ $34 trillion, Medicare ~ $62 trillion), which could double the debt burden. The conversation moves through a series of frameworks for addressing debt: growth, default, inflation, spending cuts, and tax increases. They debate the relevance of the classic R > G versus R < G argument, concluding that the political economy—whether citizens will accept higher taxes or spending cuts—is the decisive factor. Cowen argues that the U.S. can adjust via financial repression, modest inflation, and wealth/ capital‑gains taxation, while Tabarrok worries about illiquidity and market complacency. They discuss the potential fiscal impact of AI: higher productivity, longer life expectancy, and new wealth creation, but also the risk that much of the gains will be welfare‑type rather than taxable wealth. International parallels are drawn with Japan’s sovereign‑wealth‑fund‑like public pension system and the growing correlation of global asset markets, raising systemic risk. The episode ends with reflections on crypto‑stablecoins as a symptom of a more correlated financial world, and a cautious optimism that, despite extreme‑case worries, the debt is not an imminent crisis.

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