Do not have a currency exchange rate between the Member countries. There is also a common economic institutions use or define the format of the institutions in the same manner. The important thing is to demonstrate clear economic Union.
Do not need to exchange rates between member countries. There are also a common economic institutions. Or provision of the institutions in the same manner. Importantly, the expression of a clear economic union.
Do not have foreign exchange rate members. There are also used economic institution together. Or specify the form of Institute in the same manner. The important expression of economic union to clear.