The case for trade
Countries trade because of comparative advantage: each can specialize in what it produces at the lowest opportunity cost, then trade. This tends to increase total output, lower prices and widen consumer choice.
Free trade means trade without barriers such as tariffs and quotas. In practice, most trade is governed by agreements that reduce, but don’t eliminate, barriers.
Barriers to trade
| Barrier | What it is |
|---|---|
| Tariff | a tax on imports, which raises their price |
| Quota | a limit on the quantity of imports |
| Subsidy | government payments to domestic producers |
| Regulations | standards that may unintentionally or intentionally block imports |
| Supply management | Canada’s system controlling dairy, poultry and egg production and imports |
Protectionism means using these tools to shield domestic industries. Supporters argue it protects jobs, national security and emerging industries. Critics argue it raises prices, invites retaliation and reduces efficiency.
Major trade agreements and organizations
| Agreement or organization | Year | Members | Notes |
|---|---|---|---|
| GATT | 1947 | many countries | reduced tariffs after WWII |
| World Trade Organization | 1995 | about 166 members | sets global trade rules and settles disputes; its appeals body stopped functioning in 2019 |
| Canada–U.S. Free Trade Agreement | 1989 | Canada, U.S. | removed most tariffs |
| NAFTA | 1994 | Canada, U.S., Mexico | expanded free trade in North America |
| CUSMA / USMCA | 2020 | Canada, U.S., Mexico | replaced NAFTA; updated auto, dairy, labour and digital rules |
| CETA | 2017 | Canada and the European Union | removed most tariffs |
| CPTPP | 2018 | Canada, Japan, Australia, Vietnam, Mexico, the UK and others | Asia-Pacific trade agreement |
| European Union | 1993 (roots in 1957) | European countries | single market and, for many, a common currency, the euro |
Globalization
Globalization is the increasing integration of economies, cultures and people. Drivers include:
- trade agreements and lower tariffs
- container shipping and cheaper transport
- the internet and digital communication
- multinational corporations and foreign investment
- migration and travel
Global supply chains
A supply chain is the network involved in producing a product. A smartphone may use minerals from Africa and South America, chips from Taiwan and South Korea, assembly in China or Vietnam, and design in the U.S. Integrated supply chains reduce costs but can be fragile, as shortages during the COVID-19 pandemic showed.
Effects of globalization
| Benefits | Costs and concerns |
|---|---|
| lower prices and more choice for consumers | job losses in industries facing foreign competition |
| economic growth; hundreds of millions lifted out of poverty, especially in Asia | rising inequality within some countries |
| access to bigger markets for exporters | environmental damage and emissions from production and shipping |
| spread of technology and ideas | labour exploitation in some supply chains |
| cultural exchange | cultural homogenization |
| vulnerability to global shocks |
Trade balance
A trade deficit occurs when a country imports more than it exports; a trade surplus is the reverse. Economists debate how much trade balances matter; they reflect savings, investment and currency flows, not simply "winning" or "losing" at trade.
A changing trade landscape
Recent years have seen a shift toward protectionism and "economic security":
- U.S. tariffs on China (from 2018) and Chinese retaliation
- U.S. tariffs on Canadian steel and aluminum (2018) and broad tariffs on many trading partners, including Canada, in 2025, followed by retaliation and negotiations
- Reshoring and friend-shoring: moving production home or to allied countries
- competition over critical minerals and semiconductors
Canada, heavily dependent on the U.S. market, has looked to diversify trade through agreements with Europe and Asia.
Try it yourself
- Explain comparative advantage using two countries and two products.
- Analyze the benefits and costs of CUSMA for one Canadian or American industry.
- Trace the supply chain of a product you use daily.
- Debate: "Countries should use tariffs to protect key industries."
Quick recap
- Trade is based on comparative advantage; free trade removes barriers.
- Tariffs, quotas and subsidies are tools of protectionism.
- The WTO and agreements like CUSMA, CETA and CPTPP govern trade.
- Globalization brings growth and lower prices but also job losses, inequality and environmental concerns.
- Recent years have seen rising tariffs and a focus on economic security.