Comparative Advantage and Opportunity Cost
Comparative advantage concerns lower opportunity cost, not simply larger output.
About 20 minutes, plus any extended practice
Supplied materials
- Paper and pencil; a calculator is optional.
- Calculation rule: Opportunity cost of one poster = forgone cards ÷ possible posters.
- Fictional case 1: Fictional team can make 12 cards or 4 posters with the same resources. Cards forgone per poster?
- Fictional case 2: Fictional team can make 20 cards or 5 posters. Cards forgone per poster?
- Fictional case 3: Fictional team can make 18 cards or 6 posters. Cards forgone per poster?
- Fictional case 4: Fictional team can make 24 cards or 4 posters. Cards forgone per poster?
- Fictional case 5: Fictional team can make 10 cards or 5 posters. Cards forgone per poster?
- Fictional case 6: Fictional team can make 28 cards or 7 posters. Cards forgone per poster?
- Fictional case 7: Fictional team can make 30 cards or 6 posters. Cards forgone per poster?
- Fictional case 8: Fictional team can make 32 cards or 8 posters. Cards forgone per poster?
- Additional worked comparison: fictional team B can make 14 cards or 7 posters with the same resources; assume constant trade-offs.
- Extension comparison: fictional team C can make 18 cards or 3 posters; compare with the supplied 32-card/8-poster team.
Learn the idea
Comparative advantage concerns lower opportunity cost, not simply larger output. The fictional model assumes fixed resources and a straight-line, constant trade-off between two endpoint outputs. The opportunity cost of one poster equals forgone cards divided by possible posters. Compare ratios using the same unit before discussing specialization.
Opportunity cost of one poster = forgone cards ÷ possible posters.
Work from the stated fictional inputs and show each operation. Report the required unit and retain the model’s conditions. A calculated change can describe this exercise accurately without proving a causal policy effect in the real world. Check what has been omitted before applying a numerical model to a decision.
- Read the stated fictional case and identify the required output.
- Opportunity cost of one poster = forgone cards ÷ possible posters.
- Write the values into the rule, calculate and report the required unit.
- Explain one condition the calculation does not establish about actual society.
See the method in action
Assume constant trade-offs and fixed resources. Team A can make 12 cards or 4 posters; B can make 14 cards or 7 posters. A gives up 12÷4=3 cards per poster; B gives up 14÷7=2. B has comparative advantage in posters because 2<3. For cards, A gives up 4÷12=1/3 poster; B gives up 7÷14=1/2. A has comparative advantage in cards even though B can produce more of either good. Lower opportunity cost differs from larger output.
Check your reasoning
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Helpful tips
- Opportunity cost of one poster = forgone cards ÷ possible posters.
- Keep the stated unit and model conditions. A calculated output does not establish a real-world causal effect.
See the answer and explanation
4 cards
Opportunity cost of one poster = forgone cards ÷ possible posters. Calculation: 20/5 = 4 cards. This is a result for the supplied fictional inputs, not an observed statistic or guaranteed forecast.
Take it further
New comparison under constant trade-offs: supplied team X can make 32 cards or 8 posters; additional team C can make 18 cards or 3 posters. Which has comparative advantage in each good? Expected: X sacrifices 32÷8=4 cards per poster versus C’s 18÷3=6, so X has poster advantage. C sacrifices 3÷18=1/6 poster per card versus X’s 8÷32=1/4, so C has card advantage. These model ratios do not specify a real trade price or guarantee gains.
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