I.-The Competition Authority shall be informed in advance of the group purchasing agreements referred to in the first paragraph of Article L. 462-10 when the following two conditions are met:
a) The total worldwide turnover excluding tax of all the undertakings or groups of natural or legal persons party to such agreements exceeds 10 billion euros;
b) The total turnover excluding tax achieved on purchases in France under such agreements by all the undertakings or groups of natural or legal persons party to such agreements exceeds 3 billion euros.
II.-For the purposes of assessing the threshold referred to in b of I, two or more agreements within the meaning of Article L. 462-10 concluded within a period of two years between the same undertakings or groups of natural or legal persons shall be considered as a single agreement occurring on the date of the first.