Answer:
a. increased employment in the domestic export sector
Explanation:
The primary gain from the international trade is more good than , by the attainment through the domestic production alone .
When the countries trade specialization occurs , the countries in which they have comparative advantage produce the good more efficiently . Hence , the resources of other country can be used for the production of some other goods . So people benefit from trade as they get more variety of goods at a lower price and they are able to consume outside their PPF .