The energetic implementation of the 1992 programme should not be allowed to put the contribution of the Court of Justice to the establishment of the Common Market in the shade. Its case law on the direct effect of Treaty provisions concerning the free circulation of persons, services and goods enables European workers and business-men to fight effectively against protectionism in the EEC Member States. The Court gives, moreover, a very broad interpretation to the prohibitions contained in these provisions and, reciprocally, a very restrictive interpretation to their exceptions. This approach leads to the removal of nearly every obstacle to free trade. Liberalisation has its limits however. Certain economic activities require regulation, even if it has restrictive effects.