Drawing on a new analytical framework provided by the economic theory of optimal legal areas, this paper identifies the factors determining the optimal size of the European Union. It applies this theory to the question of how enlargement affects the welfare of the current and the new members of...

Before joining the European Union countries from Central and Eastern Europe have to adopt the acquis communautaire, i.e. the system of legal rules developed in the Union. The paper outlines an economic theory of optimum legal areas, that is used to determine the optimal size of the Union as well...