a) Microville has an absolute advantage in cars because it produces 10 cars, 5 more than Macroville.
b) if Macroville decides to use all of its resources and produce 20 boats, the opportunity cost is 5 cars.
c) Microville has a comparative advantage in cars because it has a lower opportunity cost than Macroville. It costs Microville only 1 boat in opportunity cost for each car and Macroville is 4 boats for each car.
d) in specializing each country produces the max no of goods with the lowest opportunity cost. so Microville makes 10 cars, Macroville makes 20 boats and then they trade with each other.