Chapter 9: International Trade

Chapter 9: International Trade — Summary

Central idea

The lecture introduces basic models of international trade and examines how trade affects consumers, producers, and total economic welfare. Its main conclusion is that trade generally increases total economic surplus—the “economic pie”—but does not benefit everyone equally. Trade restrictions, such as tariffs and import quotas, can protect some domestic producers, but they reduce overall surplus by distorting production and consumption.

Trade without international exchange: Autarky

• Autarky means a country does not trade with other countries.
• In an autarkic market, domestic supply and demand determine the equilibrium price and quantity.
• Consumer surplus is the area below the demand curve and above the market price.
• Producer surplus is the area above the supply curve and below the market price.
• Together, consumer and producer surplus make up total surplus.

How the world price determines trade

Compare the world price with the domestic price that would prevail under autarky:

• If the world price is higher than the autarky price, domestic producers can sell for more abroad than at home, so the country exports the good.
• If the world price is lower than the autarky price, domestic buyers can purchase more cheaply from abroad, so the country imports the good.

This pattern is connected to comparative advantage: countries tend to specialize in goods they can produce at a relatively lower opportunity cost.

Welfare effects of opening trade

When the country becomes an exporter

• The domestic price rises to the world price.
• Domestic producers increase production, while domestic consumers buy less.
• Consumers lose because they face a higher price.
• Producers gain because they receive a higher price and sell more.
• Some surplus is transferred from consumers to producers.
• Total surplus increases because the gains from trade exceed the losses to the losing group.

When the country becomes an importer

• The domestic price falls to the world price.
• Domestic consumers buy more, while domestic producers supply less.
• Consumers gain from lower prices and greater consumption.
• Producers lose because they receive a lower price and sell less.
• Some surplus is transferred from producers to consumers.
• Total surplus increases because the gains from trade exceed the losses.

Overall implication

Trade creates winners and losers, but in the basic model, the gains to the winners are larger than the losses to the losers. In principle, some of the gains could be used to compensate those harmed by trade while leaving a net benefit. However, trade politics can be contentious because those who lose may organize and lobby for restrictions.

Tariffs

A tariff is a tax on imported goods. It applies to imported units, so it matters when a country imports the good.

How a tariff affects the market

1. The tariff raises the price paid for the imported good in the domestic market.
2. Domestic producers respond to the higher price by supplying more.
3. Domestic consumers respond by buying less.
4. Imports fall.
5. The government collects tariff revenue on the remaining imports.

Surplus effects

• Consumers lose surplus as the price rises.
• Domestic producers gain surplus.
• The government receives tariff revenue, calculated as the tariff per unit multiplied by the number of imported units.
• Total surplus falls because of two areas of deadweight loss:
  • Production distortion: Higher prices encourage domestic production that costs more than buying the good at the world price.
  • Consumption distortion: Some consumers who value the good more than its world-market cost stop buying it because the tariff raises the domestic price.

A tariff benefits some domestic producers and raises government revenue, but the losses to consumers exceed those gains. The difference is the deadweight loss.

Import quotas

An import quota limits the quantity of a good that may be imported. Governments commonly administer quotas through import licenses.

• A quota is non-binding if it permits at least as many imports as would occur without the quota. In that case, it has no effect.
• A quota is binding if it restricts imports below the free-trade level.
• A binding quota reduces the quantity available from imports and raises the domestic price.

A quota can have the same market effects as a tariff if it is set to produce the same level of imports. Both can raise prices and create production and consumption distortions. The difference is how the resulting revenue or economic rents are allocated:

• A tariff generates revenue for the government.
• A quota does not automatically generate government revenue. The value of import licenses may instead go to license holders, unless the government sells or auctions the licenses.

Other benefits of free trade

The lecturer identifies several benefits beyond the surplus gains shown in the basic graphs:

• Greater variety of goods: Trade gives consumers access to products unavailable domestically. A wider range of choices can be valuable even if consumers do not buy every available product.
• Economies of scale: Access to larger markets can allow firms to expand production and benefit from efficiencies, including worker specialization.
• More competition: Foreign competition can pressure businesses to become more efficient, innovate, and offer better value.
• Higher productivity: Less productive firms may lose market share, while more productive firms are more likely to survive and grow.
• Flow of ideas and technology: Trade can bring technologies and better production methods to countries that might not develop them independently.
• Less rent-seeking: Protection can prompt industries to lobby for special favors. The lecturer argues that limiting protection reduces incentives to spend resources seeking political advantages.

Arguments against free trade and the lecturer’s assessment

• Domestic job losses: Import competition can reduce employment in affected industries. The counterargument is that trade also supports jobs in other sectors, including those that sell to foreign markets. The lecturer considers support for displaced workers—such as retraining or unemployment benefits—more appropriate than trying to prevent all economic change.
• National security: A country may want to preserve domestic capacity in strategically important industries, such as steel. The lecturer considers this argument potentially persuasive but cautions that it should be assessed by credible national-security experts, rather than simply invoked by an industry seeking protection.
• Infant industries: This argument holds that a new domestic industry should be protected until it matures. The lecturer is skeptical, questioning why an industry that cannot compete when young would necessarily become competitive later.
• Unfair foreign competition: Domestic firms may seek protection when foreign competitors receive government subsidies. The lecturer is unconvinced that this automatically justifies tariffs or quotas.
• Protection as a bargaining tool: A country might threaten restrictions to gain political concessions. The lecturer warns that this is risky: other countries may retaliate, leading to wider protectionism that reduces trade and economic welfare.

Trade cooperation and the prisoner’s dilemma

The lecture uses the prisoner’s dilemma as an analogy for international trade policy:

• Countries may have incentives to protect their own industries.
• If one country imposes restrictions, others may retaliate.
• Although each country may see protection as useful individually, widespread restrictions can leave all countries worse off.
• Agreements and institutions can encourage cooperation by helping countries honor commitments and respond when agreements are broken.

The lecturer cites NAFTA and GATT as examples of trade agreements intended to support cooperation and freer trade.

Speakers and sources featured

• Speaker: Dr. Azevedo, the sole narrator and economics instructor.
• Sources and materials mentioned:
  • An unnamed textbook used as the basis for some of the discussion.
  • The speaker’s related videos on gains from trade, consumer and producer surplus, and oligopoly.
  • NAFTA and GATT, mentioned as examples of trade agreements.