For the purposes of this Treaty, save as otherwise provided therein:

1. (a)

   ‘person’ means any natural person who pursues all or any of his activities in the territories of Member States within the field specified in the relevant chapter of this Treaty;

2. (b)

   ‘undertaking’ means any undertaking or institution which pursues all or any of its activities in the territories of Member States within the field specified in the relevant Chapter of this Treaty, whatever its public or private legal status.