Article 3

1. The Union shall have exclusive competence in the following areas:

(a) customs union;

(b) the establishing of the competition rules necessary for the functioning of the internal market;

(c) monetary policy for the Member States whose currency is the euro;

(d) the conservation of marine biological resources under the common fisheries policy;

(e) common commercial policy.

2. The Union shall also have exclusive competence for the conclusion of an international agreement when its conclusion is provided for in a legislative act of the Union or is necessary to enable the Union to exercise its internal competence, or insofar as its conclusion may affect common rules or alter their scope.