The country that should import airplanes is country A.
The country that should import airplanes is the country that does not have a comparative advantage in the production of airplanes. A country has comparative advantage in production if it produces at a lower opportunity cost when compared to other countries.
A country has a lower opportunity cost if it forgoes less quantity of an alternative product when producing another product.
Opportunity cost of country A in the production of airplanes: 8 million / 8 = 1 million
Opportunity cost of country B in the production of airplanes: 4 million / 6 = 670,000
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