Gains from trade
Access to lower-cost imports can increase consumer surplus by more than the corresponding reduction in producer surplus, creating a net national welfare gain.
International trade video lessons
How Countries Gain from Trade Agreements
Trade agreements reduce barriers between participating countries. They can expand trade, lower prices, create export opportunities and allow countries to specialize according to comparative advantage. However, the gains are not necessarily distributed equally across consumers, producers, industries, workers or regions.
Trade creation
A lower-cost import from a partner country replaces more expensive domestic production, improving efficiency and potentially increasing national welfare.
Trade diversion
Preferential treatment shifts imports away from a lower-cost non-member toward a higher-cost member, potentially reducing some of the agreement's welfare gains.
What you will learn
- How opening an economy to trade can increase total economic welfare.
- Why consumers and import-competing producers experience different effects.
- How preferential trade agreements, free trade agreements and customs unions differ.
- Why some agreements create efficient new trade while others divert trade from lower-cost suppliers.
- How empirical research can identify which products and industries benefit from a trade agreement.
- How these principles apply to the Canada–Chile agreement and current Canada–India CEPA negotiations.
How an importing country gains from free trade
When an economy opens to international trade, consumers may obtain an imported good at a price below the domestic price that prevailed under autarky. Domestic consumption increases because the good becomes less expensive, while domestic producers reduce production because they face competition from lower-cost foreign suppliers.
Consumers gain from the lower price. Import-competing producers lose, but the increase in consumer surplus can exceed the reduction in producer surplus. The difference represents a net increase in national economic welfare.
Video: Gains from Trade for an Importing Country — Consumer and Producer Surplus
Lesson summary
- The domestic price falls to the lower world price.
- Domestic consumption increases.
- Domestic production decreases.
- Imports equal the difference between domestic consumption and domestic production.
- Consumers gain from the lower price.
- Import-competing producers lose.
- The consumer gain exceeds the producer loss in the standard competitive model.
Net national welfare gain = increase in consumer surplus − reduction in
producer surplus
The existence of an overall welfare gain does not mean that every person or industry gains. Trade creates winners and losers, making adjustment assistance, labour-market mobility and the distribution of gains important policy considerations.
From free trade to trade agreements
Complete global free trade is rare. Countries instead negotiate agreements that reduce selected barriers between participating economies. The extent of integration differs across preferential trade agreements, free trade agreements and customs unions.
| Arrangement | Treatment among members | Treatment of non-members | Main policy implication |
|---|---|---|---|
| Preferential trade agreement | Members provide lower tariffs or other preferences on selected products. | Each member retains its own barriers against non-members. | Coverage may be limited to particular products or sectors. |
| Free trade agreement | Members remove tariffs on a substantial share of trade between them. | Each member maintains its own external trade policy. | Rules of origin are needed to determine which goods qualify for preferential treatment. |
| Customs union | Members trade freely or nearly freely with one another. | Members adopt a common external tariff toward non-members. | Integration is deeper because external tariff policy is partly coordinated. |
Do trade agreements always increase welfare?
A preferential agreement reduces trade barriers for member countries but not necessarily for the rest of the world. Its welfare effects therefore depend on whether it replaces costly domestic production with lower-cost partner imports or instead redirects imports away from an even more efficient non-member supplier.
Video: Do Trade Agreements Always Help? Preferential Trade Agreements, Trade Creation and Trade Diversion
Lesson summary
- Preferential agreements reduce barriers among members.
- Trade creation replaces higher-cost domestic production with lower-cost imports from a partner.
- Trade diversion replaces lower-cost imports from a non-member with higher-cost imports from a preferred partner.
- An increase in bilateral trade is not sufficient evidence that national or global welfare increased.
- The balance between trade creation and trade diversion depends on tariff levels, production costs and the structure of the agreement.
Trade creation
Trade is created when tariff reductions allow a lower-cost partner supplier to replace a higher-cost domestic producer. Domestic resources can then shift toward activities in which the country is relatively more productive.
Trade diversion
Trade is diverted when preferential access causes imports to shift away from the lowest-cost world supplier toward a higher-cost member country. The importing country may lose tariff revenue while paying more for the good than it would under non-discriminatory free trade.
Welfare effect of an agreement = gains from trade creation − losses from
trade diversion and forgone tariff revenue
Research example: The Canada–Chile Free Trade Agreement
The Canada–Chile Free Trade Agreement provides a useful real-world case of preferential tariff liberalization. In research with Andrey Stoyanov, I examined how the agreement affected agricultural trade between Canada and Chile.
Tariff reductions can expand bilateral agricultural trade, but the effects are not uniform across products. Existing trade relationships, product characteristics, seasonal patterns and the ability of industries to respond to new market access all influence which sectors benefit.
The broader analytical lesson is that an agreement should not be evaluated only by whether total bilateral trade increased. It is also necessary to determine which products expanded, whether the new trade replaced domestic production or displaced imports from other suppliers, and how producers and consumers adjusted.
Research: Nisha Malhotra and Andrey Stoyanov, Analyzing the Agricultural Trade Impacts of the Canada–Chile Free Trade Agreement, CATPRN Working Paper 2008-08.
Current application: Canada–India CEPA negotiations
Current status: Canada and India formally launched negotiations for a Comprehensive Economic Partnership Agreement in November 2025. In June 2026, the two governments reaffirmed their shared objective of concluding the negotiations during 2026.
The proposed agreement is intended to cover goods, services, investment, agriculture and agri-food, digital trade, mobility and sustainable development. The final tariff schedules, rules of origin, sectoral commitments and regulatory provisions have not yet been concluded.
Commercial opportunities may arise in sectors such as energy, critical minerals, clean technology, agricultural products, potash, professional services, digital trade and investment. However, actual gains will depend on the negotiated provisions and on whether firms can use the new market access.
The Canada–Chile experience is relevant because it demonstrates why the effects of a trade agreement should ultimately be studied at the product, firm and industry level rather than inferred from the signing of the agreement alone.
Questions to examine after an agreement is implemented
- Which tariffs were reduced, and by how much?
- Which products experienced the largest increase in trade?
- Did new trade replace domestic production or imports from another country?
- Which firms were able to satisfy the rules of origin?
- Did small and medium-sized firms use the new preferences?
- Were the gains concentrated in particular industries, provinces or regions?
Another example: NAFTA and CUSMA
NAFTA reduced trade barriers among Canada, the United States and Mexico and contributed to the development of highly integrated North American supply chains. It was replaced in 2020 by the Canada–United States–Mexico Agreement, known in Canada as CUSMA.
North American trade illustrates both the gains and the complications of deep economic integration. Firms gain access to larger markets and regional production networks, but changes in tariffs, rules of origin, border procedures or local-content requirements can affect industries differently depending on where production occurs and how often inputs cross national borders.
Key takeaway: Trade agreements can create important welfare gains, but an increase in total or bilateral trade is not by itself proof that every country, industry or household benefited. Good analysis distinguishes aggregate gains from their distribution and separates genuine trade creation from trade diversion.