EN
The aim of this article is an attempt to verify selected theoretical concepts of the European integration based on the results of the eleven years (1999-2010) of the common monetary system that has been in operation in the European Union. The following theories are examined: neo-functionalism, institutionalism, constructivism, realism and intergovernmental liberalism. The aim of this paper is also to find hierarchy of the discussed theories, which are at least partly applicable to the common currency system in Europe. At the end of the article some predictions of future developments of the system are presented