International Trade Theory
International trade theory explains why nations trade, what they should produce, and how money flows between countries. Three concepts form the core: competitive advantage (why countries specialize), balance of trade (what the flow of goods looks like), and exchange rates (what the flow of money looks like).
Absolute vs. Comparative Advantage
These two terms are the most-confused pair in Ch5. They sound similar but describe completely different things.
| Term | Definition | Key Word | Example |
|---|---|---|---|
| Absolute Advantage | The ability to produce something more efficiently than any other country | any other | Saudi Arabia and oil; Canada and timber; Brazil and coffee |
| Comparative Advantage | The ability to produce some goods more efficiently than other goods — within a country’s own portfolio | within itself | Canada produces wheat more efficiently than it produces microchips, so it specializes in wheat |
graph TD A[Absolute Advantage] -->|"Country A is the\nbest in the world at X"| B["Example: Saudi Arabia\nproduces oil more efficiently\nthan any other nation"] C[Comparative Advantage] -->|"Country A is better\nat X than at Y\n— so specialize in X"| D["Example: Canada is better\nat farming than at electronics\n— specialize in farming, trade for electronics"]
(diagram saved)
Exam trap — the key distinction:
- Absolute advantage = you vs. the whole world at one product
- Comparative advantage = you vs. yourself across different products
Why comparative advantage matters: The theory says countries should specialize in what they produce most efficiently and trade for the rest. This is the theoretical argument for free trade because it is believed to:
- Maximize total world output
- Increase production efficiency globally
- Raise the average standard of living
Balance of Trade
Formula: Balance of Trade = Exports − Imports
| Result | Name | Meaning |
|---|---|---|
| Exports > Imports | Trade Surplus (Positive Balance) | Country is selling more to the world than it buys — generally favourable |
| Imports > Exports | Trade Deficit (Negative Balance) | Country is buying more from the world than it sells — generally unfavourable |
Canada’s case study: Canada typically runs a large trade surplus with the United States (its biggest export market). However, in 2009, due to the US economic downturn, falling commodity prices (especially crude oil), and reduced global demand, Canada posted its first trade deficit in 34 years.
Exam tip: Know the formula. Know which direction = surplus vs. deficit. The Canada/US example is a likely application question.
Balance of Payments
Balance of Payments = the flow of all money into or out of a country — not just trade in goods, but all financial transactions including investment flows, tourism spending, and transfer payments.
Balance of trade is a subset of balance of payments. Balance of trade covers goods; balance of payments covers everything.
Exchange Rates
An exchange rate is the rate at which one currency can be exchanged for another.
In a floating exchange rate system, rates are set by supply and demand — a currency rises in value when demand for it increases.
What Drives Demand for a Currency?
| Factor | Effect |
|---|---|
| Economic health — strong GDP, low debt, trade surplus | Increases demand → currency strengthens |
| Risk profile — political stability, low inflation | Low risk → higher demand → stronger currency |
| Political decisions — wars, protectionism | Increases uncertainty → reduces demand → weakens currency |
Case study — 2008–2009 recession: As the recession deepened, investors fled to the US dollar because it was perceived as the safest currency — demand rose, so the dollar strengthened. As the world economy stabilized in late 2009, confidence returned to other currencies and the dollar weakened.
Key insight for exams: Exchange rates follow supply and demand logic. A stronger economy = stronger currency demand = higher exchange rate. This is the same supply/demand logic from Ch1.
National Competitive Advantage
Beyond the firm level, a country’s competitive position in world markets reflects a combination of four factors:
- Factor conditions — labour, natural resources, infrastructure
- Demand conditions — size and sophistication of domestic demand
- Related and supporting industries — presence of strong supplier networks
- Firm strategies, structures, and rivalries — the nature of domestic competition
This framework (often called the Diamond Model) explains why some countries dominate specific industries — Canada in resource extraction, Germany in engineering, Japan in electronics.
Cross-Course Connections
GlobalBusiness — comparative advantage explains why globalization produces economic benefits SupplyAndDemand — exchange rates operate on the same supply/demand logic as any good or service TradeBarriersAndAgreements — trade barriers distort the comparative advantage system; protectionism interferes with specialization EconomicIndicators — balance of trade is a macroeconomic indicator of national economic health
Key Points for Exam/Study
- Absolute advantage = best in the world at producing X; Comparative advantage = better at X than Y within your own production portfolio
- Comparative advantage is the theoretical foundation of free trade: specialize in your best, trade for the rest
- Trade surplus = Exports > Imports; Trade deficit = Imports > Exports
- Balance of payments is broader than balance of trade — all money flows, not just goods
- Exchange rates are driven by supply and demand for currencies — stronger/safer economies attract more demand → stronger currency
- Canada’s first trade deficit in 34 years came in 2009 (US recession + oil price crash)
Open Questions
- Does comparative advantage still hold when trade barriers and subsidies heavily distort what countries “naturally” produce most efficiently?
- How do exchange rate fluctuations affect Canadian businesses that export primarily to the US?