A common tool for restricting trade through quantity is:

Question

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An import quota is a tool used to restrict trade through quantity. It limits the amount of a particular good that can be imported into a country during a specific time period. This can be used to protect domestic industries or regulate the supply and demand of certain goods. A tariff is a tax on imported or exported goods that can also be used to restrict trade, but it is not specifically related to quantity. Immigration restrictions and international waters use policies are not typically used as tools for restricting trade.

A Common Tool for Restricting Trade Through Quantity Is