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Recorded at the PSE-CEPR Policy Forum, Paris School of Economics.Tariffs move trade around, but so does economic power. When one economy dominates, other countries fall into step with it. They trade with the dominant economy, and also with each other. Alberto Martin (Barcelona School of Economics, CEPR) is one of a team that has tracked the influence of hegemons, large dominant economies, on trade from the start of the 19th century. In  our latest VoxTalk he tells Tim Phillips about how they used treaties (not necessarily about trade) as a proxy for alignment, and built a database of 77,000 of them signed between 1800 and 2020 to test their theory.Hegemons sign a disproportionate share of these international agreements. After treaty-signing, trade links become stronger. But treaty-signing has fallen sharply over the past 15 years, as much as it did during the two world wars. If we are heading towards a multipolar world, might what will the absence of a global hegemony do to trade?The research behind this episode:Broner, Fernando, Alberto Martin, Josefin Meyer, and Christoph Trebesch. 2025. <a href="https://cepr.org/publications/dp20339">"Hegemonic Globalization."</a> CEPR Discussion Paper 20339 (gated).To cite this episode:Phillips, Tim, and Alberto Martin. 2025. "How superpowers shape trade." VoxTalks Economics (podcast).About the guest<a href="https://crei.cat/people/martin/">Alberto Martin</a> is a Senior Researcher at the Center for Research in International Economics (CREI), an Adjunct Professor at Universitat Pompeu Fabra, a Research Professor at the Barcelona School of Economics, and a Research Fellow at the Centre for Economic Policy Research, where he directs the International Macroeconomics and Finance programme. His research spans macroeconomics, finance, and international economics, including asset bubbles, credit cycles, sovereign debt, and the political economy of trade.Research cited in this episodeGlobal Treaty Database. The dataset at the heart of the paper, assembled by the authors from the United Nations Treaty Collection, the League of Nations archive, and country-specific historical sources. It records roughly 77,000 international agreements signed between 1800 and 2020, most of them bilateral, sorted into economic and non-economic categories such as trade, taxation, migration, borders, and military cooperation.Hegemonic stability. The idea, introduced by Charles Kindleberger in 1973, that an open and stable world economy needs a single dominant power to underwrite it. This paper builds a formal model of the mechanism Kindleberger described, and asks what happens to openness when dominance is contested.Alignment and UN voting. The most common existing proxy for how closely two countries are aligned is whether they vote together at the United Nations. The authors' treaty measure correlates with UN voting in some periods and less in others, partly because many UN votes turn on narrow questions; treaties cover more policy areas and reach back 200 years, which UN voting cannot.The recent decline in treaty-signing. Since 1800 treaty-signing has trended upward, interrupted by three sharp falls: the First World War, the Second World War, and a decline over the last 15 years that is proportionally comparable to the first two. The authors checked large-country sources directly to rule out a reporting lag, and the fall appears real.More VoxTalks Economics episodes<a href="https://cepr.org/multimedia/safety-paradox">The safety paradox</a>. Isabelle Méjean on how, when countries impose trade restriction to protect themselves, it also makes conflict more likely. Related reading on <a href="http://VoxEU.org">VoxEU.org</a><a href="https://cepr.org/voxeu/columns/why-globalisation-needs-leader-hegemons-alignment-and-trade">Why globalisation needs a leader: Hegemons, alignment, and trade</a>, the authors' own VoxEU column setting out the theory of hegemonic globalisation and what a shift from a unipolar to a multipolar world might mean for trade.<a href="https://cepr.org/voxeu/columns/bilateralism-system-europes-early-trade-treaties-and-lessons-eu-trade-policy">From bilateralism to a system: Europe's early trade treaties and lessons for EU trade policy in a contested world</a>, a VoxEU column by Laura Panza and Maria Ptashkina drawing on nearly 900 commercial treaties from 1815 to 1919 to argue for expanding networks of agreements even without universal multilateralism.</div>

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