Free Trade Area: A free trade area is an agreement between two or more countries to eliminate tariffs and other trade barriers on goods traded among the participating nations, but each country maintains its own tariffs on imports from non-member countries.
Common Market:A common market is a type of economic integration that goes beyond a customs union by allowing the free movement of labor and capital, in addition to the free movement of goods, between the participating countries.
Economic Union: An economic union is the highest level of economic integration, where countries not only eliminate trade barriers and have a common external tariff, but also harmonize their economic policies, such as monetary, fiscal, and social policies.