Trade theories predict and explain the consequences of economic integration. Generally, they show that freer international trade leads to specialisation, technological convergence and faster economic growth. This study compares the conclusions of the trade theories with empirical observations of economic changes in the European Union. These empirical analyses show that the main conclusions also hold empirically. However, many detailed empirical observations often contrast the theoretical expectation. Hence, although the trade theories do predict the general changes correctly, they are not...