The purpose of a quota is to . protect local employment provide competition to local industry eliminate trade barriers between nations increase the amount of foreign imports increase the amount of foreign exchange

protect local employment

Explanation:

Quota Is the imposed trade restriction that are caused by the government which limit   the number or monetary value of goods that a country can import or export during a certain period.

In different countries it is used in the international trade to help regulate a relative amount of trade in other countries. In many instances countries impose them on specific products in other to reduce imports and increase domestic production.in essence In theory, quotas boost domestic production by restricting foreign competition.