S5 Ep50: How does trade policy affect competition?

Episode Summary

Executive Summary: The episode examines why trade liberalization can lower firms’ markups not just by boosting competition with foreign producers, but by triggering entry among firms from the same exporting country. Using data on millions of firm-product-market observations, Meredith Crowley explains that trade agreements can intensify peer competition, reduce prices, and potentially reshape how economists and policymakers assess welfare effects, inflation, and globalization.

Main Topics: From Krugman to Melitz: the evolution of trade theory (Priority: 5/5): The discussion traces how trade models moved from comparative advantage to monopolistic competition, then to heterogeneous-firm models where trade raises productivity by forcing weak firms out and expanding efficient ones. Markup changes under trade agreements (Priority: 5/5): Crowley and her coauthors study whether tariff cuts change firm pricing behavior, finding that exporter markups can fall even when market share rises, contradicting standard predictions from earlier pricing-to-market models. The role of entry and same-origin competition (Priority: 5/5): The key explanation is that trade liberalization brings new exporters from the same country into foreign markets, increasing competition among peer firms and pressuring prices downward. Large-scale empirical evidence (Priority: 4/5): The paper uses extensive customs-style data on firm prices and quantities across many countries and destinations to track before-and-after effects of tariff reductions on market share and markups. Policy relevance for welfare, inflation, and Brexit (Priority: 4/5): The findings suggest trade agreements may deliver extra consumer gains through lower markups, while trade barriers or frictions may raise prices by reducing the number of active foreign competitors. Reinterpreting recent tariff and trade outcomes (Priority: 4/5): Crowley connects the results to U.S.-China tariffs and the UK’s post-Brexit trade frictions, arguing that fewer exporters can mean more market power for surviving firms and higher consumer prices.

Key Arguments: Traditional Melitz-style trade theory explains productivity gains from trade via exit of weak firms, but it does not fully capture pricing effects in export markets. A market share increase does not necessarily imply a higher markup once entry by additional firms from the same origin is taken into account. The relevant competitive set for many exporters may be peer firms from the same country, not just domestic firms in the destination market. Trade liberalization can lower prices by increasing the number of exporters, especially when only a small number of firms were active before liberalization. The data show that when tariffs fell, firms’ market shares in destination markets rose, yet average markups fell, creating a puzzle under standard pricing-to-market models. The paper resolves the puzzle by emphasizing multi-firm entry and same-origin competition, which compresses markups through greater rivalry among exporters. These effects matter for policy because the benefits of trade agreements may be larger than previously estimated if they also reduce consumer prices through lower markups. Trade frictions may contribute to inflation if they discourage marginal exporters and leave a smaller set of firms with greater pricing power.

Data Points: Countries in sample: 11 low- and middle-income countries - Exporter-country sample used in the paper Destinations in sample: 165 destinations - Markets around the world where exports were observed Observations: 25 million - Firm-price-quantity observations used in the empirical analysis Firms represented: Over half a million firms - Scale of the underlying dataset Largest economies in data: China, Egypt, and Mexico - Examples of major exporting countries in the dataset Median number of firms per destination before liberalization: About 2 - Typical market structure in the developing-country sample before tariff cuts Market structure after entry: From 2 to 3 firms on average - Illustrative change in the number of active exporters after liberalization Tariff pass-through in cited studies: Almost 100% - Referenced evidence on U.S. tariff increases being passed into consumer prices Example tariff rate: 10% - Illustrative tariff increase discussed in relation to U.S.-China tariffs Price effect of tariff example: Price paid rose basically 10% - Cited finding from external studies on tariff pass-through to consumers

Pivotal Quotes: "What we observed was when these tariffs were coming down, we would have expected... for the Egyptian firm's market share in the European Union to go up." — Meredith Crowley: Describing the initial empirical pattern after tariff reductions "At the same time that these same firms were cutting their average markup." — Meredith Crowley: The central empirical puzzle: higher market share alongside lower markups "The key insight we got was actually this peer-to-peer competition among firms from the same origin was really important." — Meredith Crowley: Explaining the mechanism that resolves the puzzle

Implications: Trade agreements may lower consumer prices more than standard models predict by increasing same-origin competition. For policymakers, entry effects should be counted when judging trade welfare, inflation, and the costs of new trade frictions.