Which situation is an example of comparative advantage in an international market? country a decides to grow extra potatoes so they have more to export, while country b does not grow potatoes to export. factories in country a and country b produce the same number of tablet computers. country a’s factories could be used instead to build more laptops than the factories in country b. country a invests in a new technology while country b chooses to invest in education. country a can produce 100 units of rice per acre of farmland, while country b can only produce 70 units of rice per acre of farmland using the same resources.