(1) In administrative proceedings in respect of a breach of section 4 or Article 101 of the Treaty on the Functioning of the European Union -

(a) it shall be presumed that an agreement between competing undertakings, a decision made by an association of competing undertakings or a concerted practice engaged in by competing undertakings the purpose of which is to -

(i) directly or indirectly fix prices with respect to the provision of goods or services to persons not party to the agreement, decision or concerted practice,

(ii) engage in bid-rigging,

(iii) limit output or sales, or

(iv) share markets or customers,