Answer:
preferential trade agreement
Step-by-step explanation:
This agreement is known as a preferential trade agreement. It is called this because it tends to make it easier for specific goods to be traded but only to the countries that are part of the group and/or agreement. This agreement also makes it harder for countries that are not part of the agreement to be able to trade with the countries that are in order to maintain the countries within the agreement trading with each other.