7. The Authority may not approve regulatory measures: a) Applicable to retail telecommunications services where the objective of ensuring effective competition is guaranteed through regulatory measures applicable to relevant wholesale markets; and b) In telecommunications markets in which it is reasonable to expect that effective competition or self-regulation by service providers is sufficient to allow for the existence of effective competition. Article 20 Reconsideration of regulatory measures 1. A service provider may request that the Authority reconsider a regulatory measure within 14 days after the Authority has issued it and where the Authority considers that such reconsideration is appropriate under the circumstances it shall reconsider the regulatory measure. 2. Unless otherwise decided by the Authority, where any regulatory measure is under reconsideration pursuant to the preceding paragraph, it shall remain in full force pending the conclusion of such reconsideration. Article 21 Interim regulatory measures 1. The Authority may adopt interim regulatory measures, omitting such steps as provided for in paragraph 4 of Article 19, where performing such steps is not possible due to the urgency of the relevant regulatory measure and reasonable grounds exist to believe that a person has committed or is likely to commit an infringement of the present Decree-Law or of any regulatory measures hereunder resulting in a serious and immediate threat: a) To national security, public order, public health or public security; or b) Of interrupting a service provider’s telecommunications services, damaging a service provider’s facilities, network resources and/or equipment or causing substantial loss of a service provider’s revenues or increase in costs. 2. In adopting an interim regulatory measure, the Authority must state that it is an interim regulatory measure subject to the requirements of this article and state why it has not carried out the relevant steps set forth in paragraph 4 of Article 19. 3. An interim regulatory measure shall come into effect upon signature of the Chairperson of the Authority, and the Authority shall immediately provide written notice of it to any person that is subject thereto.