Answer:
"An economic and monetary union involves the free flow of products and factors of production among member-countries and the adoption of a common external trade policy, but it also requires a common currency, harmonization of members tax codes, and a common monetary and fiscal policy."
Explanation:
A monetary and economic union is a common market with a common currency. Monetary unions have not necessarily created a common market; in fact, the only monetary and economic union in the world is the Eurozone of the European Union, made up of members of the Union who have adopted the euro as their state currency. It is considered one of the most advanced stages of economic integration.
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