Three countries, x, y, and z are part of a member area where they have eliminated all barriers to trade such as tariffs, quotas, and non-tariff barriers like border restrictions, while at the same time keeping their own external tariffs against nonmembers. such an area could be described as a(n) area

free trade

Explanation:

Based on the information provided within the question such an area could be described as a free trade area. Like mentioned in the question this is known as an area that has signed a trade policy that does not restrict imports or exports as well as also being understood as the free market idea applied to international trade. Which is what is happening in this situation with countries X, Y and Z.

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sir frederic attributed inaccuracies to schemas. memory reconstruction is one part actual events and one part personal schema, which can result in inaccuracies when memories are reconstructed.