Based on the information provided, the United States has a comparative disadvantage in the production of apples and should produce apples and trade for shoes.
Here's the reasoning:
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Opportunity Cost for the US:
- If an American worker produces 20 pairs of shoes, they forego the opportunity to grow 100 apples. Therefore, the opportunity cost of producing 1 pair of shoes is 5 apples (100 apples / 20 shoes).
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Opportunity Cost for Brazil:
- If a Brazilian worker produces 10 pairs of shoes, they forego the opportunity to grow 20 apples. Thus, the opportunity cost of producing 1 pair of shoes is 2 apples (20 apples / 10 shoes).
Since the U.S. gives up more apples to make shoes than Brazil does, the U.S. has a comparative disadvantage in apples. Thus, they should specialize in shoes and trade for apples.