What is it called when multiple nations agree to apply uniform external tariffs, remove tariffs amongst themselves, and allow free movement of labor and capital within the group?

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A zone with no tariffs between member countriesAn agreement to enforce shared external tariffsA market where members remove tariffs and permit free movement of labor and capitalA union that integrates economic policies beyond trade

Explanation

A free trade area removes tariffs between members but does not have common external tariffs. A customs union applies common external tariffs but does not allow free movement of labor and capital. A common market combines a customs union with the free movement of labor and capital among member countries. An economic union goes further by integrating economic policies and institutions.