Call
Complete economic integration is the final stage of economic integration. After complete economic integration, the integrated units have no or negligible control of economic policy, including full monetary union and complete or near-complete fiscal policy harmonisation.
Complete economic integration is most common within countries, rather than within supranational institutions. An example of this are the original thirteen colonies of the United States of America, which can be viewed as a series of highly integrated quasi-autonomous nation states. In this example it is true that complete economic integration results in a federalist system of governance as it requires political union to function as, in effect, a single economy.