Answer:
The answer is stated below.
Explanation:
Supranationalism refers to the merging of nation-states into one group or alliance, politically and economically.
a) Due to the impacts of the European Union, the common currency euro is used internationally by the European Union states. Currency exchange at the borders of states in Europe is no longer necessary now.
b)Throughout the European Union member states, there is free trade at borders. There is no curtailment at border crossings.
