Final answer:
A system where a government regulates the quantity of a good or service that can be bought or sold is a form of quota.
Step-by-step explanation:
A system where a government regulates the quantity of a good or service that can be bought or sold is a form of E. quota. A quota is a government-imposed restriction on the quantity of a good or service that can be produced, imported, or sold. It sets a maximum limit on the amount that can be bought or sold, and is often used to protect domestic industries or manage scarce resources. For example, a government may impose a quota on the import of certain agricultural products to protect local farmers.