Answer: Comparative advantage.
Step-by-step explanation:
The pattern of production and trade is largely based on the comparative advantage.
Comparative advantage: A country has a comparative advantage in producing a commodity if the opportunity cost of producing that commodity in terms of other commodity is lower than the other country.
A nation exports the commodity in which it has a comparative advantage and imports the commodity in which it has a comparative disadvantage.
Therefore, it is totally depend upon the opportunity cost of producing a commodity in terms of other commodity.