The process of European integration is at a crossroads. As the Union becomes larger in terms of members, the institutional structures and decision making procedures will have to change in order for it to make policy initiatives. To meet these challenges, the Union will need an effective institutional and constitutional structure which must be both democratic and acceptable to its citizens.This major book evaluates recent developments, considers the present situation and assesses the prospects for the future of the European Union. A wide variety of institutional and constitutional issues are addressed, with special attention being paid to three main topics; decision making and including a critique of attempts to analyse European decision making using traditional power indices and a discussion of the different procedures laid down in the comitology decision; federal structures, with an analysis of the politics of European federalism among other issues; institutional change which compares the relative merits of enlarging or deepening the Union, suggesting a fifth freedom by a single European market for governments and discussing non-technical aspects of legislation in the European Union.Constitutional Law and Economics of the European Union will of interest to policymakers, academics and students of European economic and political affairs and institutional and constitutional structures.