Political Economy of International Trade

Economists have long proven that free trade increases welfare. But protectionism thrives. Why? The political economy of trade explains how interests, institutions, and ideas shape trade policy.

Economic Theory of Trade

Basic models justify the benefits of trade:

Ricardian model (comparative advantage). Even if a country produces everything less efficiently, it benefits from specializing in what it has a relative advantage in.
Heckscher-Ohlin model. Countries export goods that intensively use their abundant factor (labor, capital, land). Trade equalizes factor prices.
New trade theory. Economies of scale and imperfect competition explain intra-industry trade between similar countries.

General conclusion: trade increases aggregate welfare. But there are winners and losers.

Distributional Conflicts

The key to trade policy is understanding who wins and loses:

Stolper-Samuelson model. Trade raises incomes of owners of the abundant factor and lowers incomes of owners of the scarce factor. In wealthy countries, capital wins and labor loses from trade with poor countries.
Specific factors model. Factors are "stuck" in sectors. Export sectors win, import-competing sectors lose.

Empirically: the losers from trade are low-skilled workers in labor-intensive industries of developed countries. Competition with China hit specific regions and groups.

Political consequences: losers are concentrated and organized, winners are dispersed. Protectionism benefits the minority, but this is an active minority.

Political Models of Trade Policy

Grossman-Helpman model ("Protection for Sale"). Industry lobbyists "buy" protection from politicians. The government maximizes the weighted sum of welfare and lobbyist contributions. Explains tariff structures—organized sectors are protected.
Median voter. In a democracy, the decisive vote is the median voter. If the median voter is a labor owner, they vote for protection from imports from countries with cheap labor.
Institutions matter. Systems with proportional representation protect geographically dispersed groups. Majoritarian systems protect geographically concentrated groups (districts).
Delegation. Countries delegate trade policy to the executive and international organizations (WTO), to isolate it from protectionist pressure.

Evolution of the World Trade System

Protectionism in the 19th century. After the Napoleonic Wars, high tariffs in most countries. Exception—Great Britain after repeal of the Corn Laws (1846).
First globalization (1870–1914). Lower transport costs, gold standard, relatively low tariffs. Massive migration and capital flows.
Interwar period. Tariff war, Smoot-Hawley (1930), beggar-thy-neighbour policies deepened the Depression.
Bretton Woods and GATT (1944–1994). The US creates a liberal order. GATT—a mechanism for gradual liberalization through rounds of negotiations. Tariffs fall from 40% to less than 5%.
WTO (1995–). Institutionalization of GATT. Dispute resolution mechanism. Expansion to services, intellectual property. But the Doha Round stalled.

Modern Challenges

"China shock". China’s accession to the WTO (2001) and explosive growth of its exports hit certain industries and regions of developed countries. Political consequences—rise of populism.
Trade wars. Trump administration started a trade war with China. Tariffs as a tool of geopolitics, not just economic policy.
Regionalism. Stagnation of multilateral liberalization leads to regional agreements (USMCA, CPTPP, RCEP). Fragmentation of the world system?
Beyond tariffs. Modern barriers are not tariffs, but regulation, standards, subsidies, currency manipulation. The WTO struggles to handle these issues.
Sustainability and labor. New agendas: environmental and labor standards in trade agreements. Carbon border adjustments.

Trade and Development

A special issue—trade and developing countries:

Import substitution (ISI). Development strategy through protection of domestic industry. Dominated in Latin America in the 1950s–1970s. Results are disappointing.
Export-oriented growth. East Asian "tigers" grew through exports. But this is not pure laissez-faire—active industrial policy.
Special and differentiated regime. Developing countries have preferences in the WTO. But they also lose from protectionism of rich countries in agriculture.
Global value chains. Modern trade is not finished goods, but participation in chains. Opportunities for developing countries—but also dependence on global companies.