Essay
Mary takes 4 minutes to make a sandwich and 6 minutes to mix a cocktail. Her sister Ash takes 4 minutes to make a sandwich and 4 minutes to mix a cocktail. Calculate each sister's opportunity cost. Which of the two sisters has an absolute advantage in making sandwiches? In mixing cocktails? Which of the two has a comparative advantage in making sandwiches? In mixing cocktails?
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Mary can spend an hour to make 15 sandwi...
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