Matt Yglesias on Why the Population is Too Damn Low | Conversations with Tyler

29 Jan 2026 · 68 min
1:08:01

In this hour‑long interview, host Tyler Cowen talks with author Matt Yglesias about his new book One Billion Americans: The Case for Thinking Bigger. Yglesias argues that the United States faces a serious demographic shortfall and that a billion‑person population would unlock massive increasing‑returns‑to‑scale benefits for the economy, culture, and global influence. The conversation covers the tension between Yglesias’s personal dislike for dense cities and his belief in agglomeration economies, the role of energy innovation (especially nuclear) in sustaining growth, and how fertility subsidies, marriage incentives, and religious participation could raise birth rates without harming human capital. They discuss immigration, diversity, and the EU as a possible “billion‑person” bloc, as well as the political and governance challenges of scaling up megacities like New York. The dialogue moves into inequality, the political power of the wealthy, the future of liberal democracies, and the risk of constitutional rupture. Yglesias also shares views on urban policy (YIMBY movement, city‑level investment), monetary policy (NGDP targeting), the evolution of media (blogging vs. Twitter), his intellectual path from philosophy to economics, and personal cultural tastes ranging from music to sports. Throughout, the tone is conversational, often self‑deprecating, with a mix of optimism about scale and caution about political and social frictions.

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