Joint Dynamics of Legal and Economic Integration in the European Union

We evaluate the causal linkages between the economic and legal integration process that has characterised the formation of the European Union. Specifically, using the frequency of national references for preliminary rulings sent to the European Court of Justice as a measure of legal integration we investigate its joint dynamics with the expansion of intra-EU trade over the 1960–1998 time period. Our objective is to formally test whether any such linkages exist and the direction within which they have operated.