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Econ 101-7/2 . Interdependence and the Gains from Trade (continued). Exercise 1. Here are the PPF for Robinson Crusoe and Friday with 12 hours of labor. Questions. 1. The opportunity cost of 1 pound of fish for Robinson Crusoe and Friday.

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Econ 101-7/2

Interdependence and the

Gains from Trade (continued)


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Exercise 1

Here are the PPF for Robinson Crusoe and Friday with 12 hours of labor.


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Questions

1. The opportunity cost of 1 pound of fish for Robinson Crusoe and Friday.

2. The opportunity cost of 1 pound of coconut for Robinson Crusoe and Friday

3. Robinson Crusoe has a comparative advantage in __ and Friday has a comparative advantage in__

4. Robinson Crusoe has a comparative advantage in __ and Friday has a comparative advantage in__


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Answer to Exercise 1

1. The opportunity cost of 1 pound of fish for Robinson Crusoe and Friday

  • 4 pounds of coconuts, 3/2 pounds of coconuts.

    2. The opportunity cost of 1 pound of coconut for Robinson Crusoe and Friday

  • 1/4 pound of fish, 2/3 pound of fish.


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Answer to Exercise 1

3. Robinson Crusoe has a comparative advantage in coconuts and Friday has a comparative advantage in fish.

4. Robinson Crusoe has a comparative advantage in coconuts and Friday has a comparative advantage in fish.


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Exercise 2

  • George and Martha face these production possibilities frontiers for brownies and cupcakes.


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Questions

  • a. If George and Martha choose not to trade and divide their time equally between the production of brownies and cupcakes, how many of each would they be able to consume?

  • b. Now assume that George and Martha decide to specialize in the good in which they have a comparative advantage and then trade. Who would trade brownies and who would trade cupcakes?

  • c. If George and Martha decide to trade 60 brownies for 60 cupcakes, how many cupcakes and brownies would each have to consume?

  • d. How do we know each is better off with trade than acting alone?



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Answer to Exercise 2

  • a. If George and Martha divide their time equally, George would be able to produce 50 brownies and 100 cupcakes (point A on his PPF) and Martha would be able to produce 80 brownies and 40 cupcakes (point A on her PPF).

  • b. George has a comparative advantage in and would trade cupcakes. Martha has a comparative advantage in and would trade brownies.


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Answer

  • c. Since George is producing 200 cupcakes and no brownies, if he trades 60 cupcakes, he would be left with 140 cupcakes and would expect to receive 60 brownies from Martha in return. Since Martha is producing 160 brownies and no cupcakes, if she trades 60 brownies, she would be left with 100 brownies and would expect to receive 60 cupcakes from George in return.

  • d. We know that both George and Martha are better off with trade because both are able to consume outside their own production possibilities frontiers.


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