Understanding the fundamental principles that explain how and why countries trade with each other.
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Card 1
To obtain goods at lower opportunity cost than producing them domestically.
Explanation
When another country can provide a good more cheaply in terms of forgone alternatives, trade makes both sides better off.
Common mistake
Thinking countries trade only because they completely lack the resources to produce certain goods.
Card 2
Producing more of a good with the same resources as another country.
Explanation
Absolute advantage focuses on who is more productive using the same amount of inputs.
Common mistake
Confusing absolute advantage with being the lowest-cost producer in terms of opportunity cost.
Card 3
Having a lower opportunity cost of producing a good than another country.
Explanation
Comparative advantage is about relative trade-offs, not sheer productivity or resource levels.
Common mistake
Believing a country needs to be best at producing a good to benefit from trading it.
Card 4
One focuses on productivity levels, the other on relative opportunity costs.
Explanation
Absolute advantage asks who can make more; comparative advantage asks who sacrifices less.
Common mistake
Assuming the country with higher productivity in all goods also has comparative advantage in all goods.
Card 5
The value of the next best alternative forgone when producing a good.
Explanation
Opportunity cost captures what must be given up in order to produce something else.
Common mistake
Equating opportunity cost with the financial price of a good alone.
Card 6
Increased total consumption possibilities when countries specialize and exchange.
Explanation
By specializing according to comparative advantage, countries can jointly enjoy more goods than in isolation.
Common mistake
Thinking gains from trade imply every individual wins equally or immediately.
Card 7
Focusing on goods where they have a comparative advantage.
Explanation
Specializing where opportunity costs are lowest maximizes joint output and trading benefits.
Common mistake
Believing countries should specialize only in goods they can produce more of than others.
Card 8
Foreign producers can make it at a lower opportunity cost than domestic firms.
Explanation
Even if domestic production is possible, trade is efficient when others can produce with fewer trade-offs.
Common mistake
Assuming imports only occur when a country lacks the technology or resources to produce a good.
Card 9
By lowering average costs when firms produce larger output for global markets.
Explanation
Access to global demand lets producers spread fixed costs over more units, reducing per-unit cost.
Common mistake
Thinking economies of scale only arise from cheap labor rather than production size.
Card 10
Countries simultaneously exporting and importing different varieties of the same product.
Explanation
Intra-industry trade reflects product differentiation and economies of scale, not just basic resource differences.
Common mistake
Believing countries only trade goods that are entirely different from each other.
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