Common external tariff
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When a group of countries form a customs union they must introduce a common external tariff. The same customs duties, import quotas, preferences or other non-tariff barriers to trade apply to all goods entering the area, regardless of which country within the area they are entering. It is designed to end re-exportation; but it may also inhibit imports from countries outside the customs union and thereby diminish consumer choice and support protectionism of industries based within the customs union.
The common external tariff is a mild form of economic union, but may lead to further types of economic integration. In addition to having the same customs duties, the countries may have other common trade policies, such as having the same quotas, preferences or other non-tariff trade regulations apply to all goods entering the area, regardless of which country within the area they are entering.
Important examples of common external tariff are that of the Mercosur countries (Brazil, Argentina, Venezuela, Paraguay and Uruguay) as well as the Common Customs Tariff of the Customs Union of Belarus, Kazakhstan and Russia.
Similar to free trade areas, however external countries have to pay tax on goods and services that are entering.
See also 
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