Answer:
specialization
Explanation:
When a country specializes in the production of a certain good or service, it means that it becomes more efficient in producing that good or service. By gaining efficiency, the cost of producing the goods or services decreases, which increases the profits of trading them, and also increases the quantity of goods or services traded. For example, a country specializes in producing agricultural products and therefore can produce them at a higher quantity and a lower cost. This will result in that country trading agricultural products with other nations.
In the past only goods were traded between nations, e.g. oil, food, etc., but currently services are also traded between nations, e.g. banking services, internet services, etc.
