138. Trade and the worst financial crisis of the century—in 1866

Episode Summary

Executive Summary: This episode explains how the 1866 failure of London’s Overend, Gurney triggered a global shock to trade finance. Using this as a clean supply-side shock, Chenzi Xu shows that dependence on British banks sharply reduced exports in the short run and still reshaped trade patterns decades later, demonstrating that disruptions to finance can permanently alter who trades with whom.

Main Topics: Trade finance basics (Priority: 5/5): The hosts explain how exporters need short-term credit to cover input, payroll, and shipping costs before importers pay, and how banks bridge that timing gap. London’s dominance in 19th-century trade credit (Priority: 5/5): British banks headquartered in London supplied most global trade finance through overseas subsidiaries, making London the key node in global commerce. Why the 1866 crisis is a useful natural experiment (Priority: 5/5): Overend, Gurney’s collapse caused multiple bank failures across places differently exposed to British banks, creating variation in credit supply that helps isolate causality. Short-run trade effects of bank failures (Priority: 5/5): Ports that lost access to British bank funding experienced a dramatic immediate collapse in exports after the crisis. Long-run persistence in trade patterns (Priority: 4/5): Even after new banks entered the affected markets, exporters remained less active for decades and foreign buyers shifted away from previously exposed countries. Broader policy implications for trade costs (Priority: 4/5): The episode argues that major shocks to trade costs, including tariffs and trade wars, can have lasting effects on trade relationships, not just temporary disruptions.

Key Arguments: Trade finance is essential because exporters pay costs upfront while buyers pay later; without credit, trade cannot happen smoothly. Banks are well suited to provide trade finance because they operate locally, understand borrowers, and can take collateral. Observed drops in lending and trade during financial crises are not automatically causal because demand shocks could drive both. The 1866 London crisis provides a cleaner causal test because bank failures were a supply shock, not just a response to lower trade demand. Overend, Gurney was not itself a trade lender abroad, but its failure triggered broader panic and bank failures among institutions that did provide trade credit. More exposed ports experienced much larger export declines than less exposed ports, showing that trade depended heavily on bank credit availability. The large short-run export collapse was larger than estimates in modern studies because the historical shock involved outright bank failure and weaker options for replacing lost finance. Trade relationships are costly to build, so when exporters lose financing and buyers switch suppliers, those relationships often do not recover even after credit returns. The findings suggest that tariff shocks and trade wars may also create persistent trade reallocation, not just temporary volume declines.

Data Points: Share of trade credit from London banks: over 90% - London banks provided the vast majority of trade credit in port cities around the world during the 19th century. Share of world exports covered by London banks' locations: 98% - British banks operated in countries that accounted for nearly all world export value in the period. Date of crisis: 1866 - The year of the major London banking crisis centered on Overend, Gurney. Bank failures during crisis: 12% - Share of banks that completely failed during the 1866 crisis. Export decline in highly exposed places: 68% - Places that lost all access to British bank funding saw exports fall by this amount in the year after the crisis relative to the prior year. Long-run persistence window: decades; effects visible in 1910 - The paper finds trade effects lasting for decades, with evidence still visible in trade patterns in 1910. Post-crisis recovery of banking sector: about 5 years - New banks entered highly exposed locations within five years, yet trade effects persisted. Illustrative exposure example: Buenos Aires 20% vs. Valparaiso 80% - The hosts describe differing city-level exposure to failed British banks as a source of variation.

Pivotal Quotes: "trade finance, it helps to fill the timing gap" — Samaya Keynes: Explaining the basic function of trade finance in international commerce. "places that lost all access to British bank funding saw their exports drop by 68%" — Chenzi Xu: Summarizing the paper’s core short-run estimate of the crisis’s effect on exports. "any big change to trade costs can have long-term disruptions in who's buying from whom" — Chenzi Xu: Discussing the broader implication that finance shocks and tariffs can permanently reshape trade networks.

Implications: The episode suggests that financial shocks can permanently rewire trade networks. For today, it warns that banking crises, funding disruptions, or tariff shocks may have effects that last far beyond the initial crisis period.