When the United States imposes a quota on cheese imports, the price of cheese in the United States Increases. United States Cheese imports Decreases.
It is the simple concept of Economics, that when any product is produced or imported in a limited number, the demand of that product increases and hence results in increasing the price of that particular product.
Similarly if a a quota is attached on importing a product, that product cant be delivered on the huge quantities, so the imports drastically decreases for this product.