Comparative Advantage and the Gains from Trade

1. Comparative Advantage and the Gains from Trade

2. Outline I. Assumptions II. Absolute Advantage A. Definition B. Example III. Comparative Advantage A. Definition B. Example

3. Outline IV. Specialization A. Definition B. Example V. Terms of Trade A. Definition B. Example

4. Assumptions • Let’s say that the crew on Gilligan’s Island finds another nearby island of native folk who also produce radios and huts • Both the crew and the islanders have 7 people and the same resources. • Linear PPF • Allows us to calculate per-unit opportunity cost only once (since linear PPF’s have constant opportunity cost)

5. The Crew’s PPF Huts 120 The opportunity cost of making a radio is 6 huts. Thus the opportunity cost of making a hut is 1/6 of a radio. 90 60 30 0 Radios 7 14 21 28

6. The Islander’s PPF Huts 120 The opportunity cost of making a radio is 9 huts. The opportunity cost of making a hut is 1/9 of a radio. 90 60 30 0 Radios 7 14 21 28

7. Absolute Advantage • Absolute Advantage - an economy’s ability to produce more of a good than another country can produce with the same quantity of resources. • In this case, the crew has the absolute advantage in radios AND the absolute advantage in huts since they can make more of both (though it is possible to have the absolute advantage in only one good).

8. Comparative Advantage • Comparative Advantage - an economy’s ability to produce a good at a lower opportunity cost than another economy.

9. Comparative Advantage • The crew’s opportunity cost of making a radio is 6 huts, the islanders opportunity cost of making a radio is 9 huts, so the crew has the comparative advantage in radios • The crew’s opportunity cost of making a hut is 1/6 of a radio, the islanders opportunity cost of making a hut is 1/9 of a radio, so the islanders have the comparative advantage in making huts

10. A Note on Comparative Advantage With two economies, it is impossible for one country to have a comparative advantage in both goods.

11. Trade • Now both islands are considering trade. • Each island will produce the good in which they have the comparative advantage - why? • because they can produce it cheaper. It only costs the crew 6 huts to make a radio, while it costs the islanders 9 huts!

12. Specialization • Specialization - each country will produce only the good in which it has a comparative advantage. • So, if the crew makes radios and the islanders make huts, how do they decide upon a trading arrangement that is best for both of them?

13. The Islanders • The islanders will trade huts for radios. • They want radios as cheaply as possible • What is the most they will “pay” for a radio? • 9 huts. Because if a radio cost 10 huts, they would be better off not making 9 huts and making the radio themselves.

14. The Crew • Since the crew is making radios, they are buying huts. • They want to get as many huts as possible for one of their radios. • What is the least they would be willing to accept for a radio? • 6 huts. If they were offered 5 huts for a radio, they would be better off not making a radio and producing 6 huts themselves

15. Terms of Trade • The islanders will pay anything less than 9 huts for a radio • The crew will accept no more less than 6 huts for a radio • So anywhere between 6 and 9 huts per radio makes both islands happy

16. Why is it better to trade? • Let’s go back to the PPFs. • If the crew made all radios and traded 6 of them for 48 huts, and islanders made all huts and traded 48 for 6 radios (a terms of trade of 8 huts per radio), we will see that such a trade will allow each island to consume outside of their PPF! • Both islands win through free trade!

17. The Crew’s PPF Huts 120 90 The Crew Consumes This Much 60 30 0 Radios 7 14 21 28

18. The Islander’s PPF Huts 120 This is the consumption point for the islanders 90 60 30 0 Radios 7 14 21 28

19. Notes • It is possible for a country to have an absolute advantage and still benefit from trade. • Benefits from trade depend upon there being a comparative advantage. • Terms of Trade will be agreed upon by both countries as long as they are between each countries opportunity cost. • Must be able to trade for less than you can produce yourself.