This article provides an overview of major theoretical concepts behind the process of European economic integration. At first, the classic theory of customs unions as formulated by Viner, Meade and others is explained taking also into account factor mobility in a customs union in the move...

The process of European integration and especially the introduction of the euro as the single currency for up to now 12 member countries of the EU in 1999 may alter the existing clear currency hierarchy. The euro area is comparable in size to the US with respect to GDP and even exceeds the US...