Final answer:
An import quota is a numerical limitation on imports that restricts the amount of imports entering a country. It is not in the form of a customs duty or tax.
Step-by-step explanation:
An import quota is a numerical limitation on the quantity of products that a country can import. It is a trade barrier that restricts the amount of imports entering a country. It is not in the form of a customs duty or tax, which is a different type of trade barrier.