Those rules should also provide for appropriate incentives to promote fairness and transparency, especially as regards the ranking of corporate website users in the search results generated by online search engines. At the same time, those rules should recognise and safeguard the important innovation potential of the wider online platform economy and allow for healthy competition leading to increased consumer choice. It is appropriate to clarify that this Regulation should not affect national civil law, in particular contract law, such as the rules on the validity, formation, effects or termination of a contract, in so far as the national civil law rules are in conformity with Union law and to the extent that the relevant aspects are not covered by this Regulation. Member States should remain free to apply national laws which prohibit or sanction unilateral conduct or unfair commercial practices to the extent that the relevant aspects are not covered by this Regulation.