What was a customs union before becoming a common market?

Name: What was a customs union before becoming a common market?
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The European Union (EU) was initially a customs union before it evolved into a common market. The transition involved the elimination of customs duties and quotas between member states and the establishment of a common external tariff for goods entering the union, paving the way for the free movement of goods, services, capital, and people.

What Was a Customs Union Before Becoming a Common Market