Which approach toward European unity was most successful, the political or the economic? Why?

The most successful approach towards European unity, thus the forming of the European Union, was the economic approach of matters. The economic approach made it possible that the European countries have significant economical growth and prosper very quickly and smoothly, with the open trade and exchange of goods, as well as going on the world markets very often as one and supporting each other and thus out compete lots of other single economies.