27. Why might a low-income country put up barriers to trade, such as tariffs on imports?

28. Can a nation’s comparative advantage change over time? What factors would make it change?

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19 • Problems 469

Problems

29. France and Tunisia both have Mediterranean climates that are excellent for producing/harvesting green

beans and tomatoes. In France it takes two hours for each worker to harvest green beans and two hours to

harvest a tomato. Tunisian workers need only one hour to harvest the tomatoes but four hours to harvest

green beans. Assume there are only two workers, one in each country, and each works 40 hours a week.

a. Draw a production possibilities frontier for each country. Hint: Remember the production possibility

frontier is the maximum that all workers can produce at a unit of time which, in this problem, is a

week.

b.

Identify which country has the absolute advantage in green beans and which country has the absolute
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