1. The competent national authorities referred to in Article 11 of Directive 2003/6/EC shall maintain effective market oversight and take the necessary measures to ensure that the provisions of Articles 37 to 42 of this Regulation are complied with.
2. The competent national authorities referred to in paragraph 1 of this Article shall have the powers provided for in the national measures transposing Article 12 of Directive 2003/6/EC.
3. Member States shall ensure that the national measures transposing Articles 14 and 15 of Directive 2003/6/EC apply in relation to the persons responsible for failure to comply with Articles 37 to 42 of this Regulation in relation to auctions carried out in their territory or abroad.
4. For the purposes of application of Articles 37 to 42 of this Regulation and paragraph 1, 2 and 3 of this Article, national measures transposing Article 16 of Directive 2003/6/EC shall apply to cooperation between competent national authorities referred to in paragraph 1 of this Article.