(33)Contracting authorities should be able to choose to provide jointly their public services by way of cooperation without being obliged to use any particular legal form. Such cooperation might cover all types of activities related to the performance of services and responsibilities assigned to or assumed by the participating authorities, such as mandatory or voluntary tasks of local or regional authorities or services conferred upon specific bodies by public law. The services provided by the various participating authorities need not necessarily be identical; they might also be complementary. Contracts for the joint provision of public services should not be subject to the application of the rules set out in this Directive provided that they are concluded exclusively between contracting authorities, that the implementation of that cooperation is governed solely by considerations relating to the public interest and that no private service provider is placed in a position of advantage vis-à-vis its competitors. In order to fulfil those conditions, the cooperation should be based on a cooperative concept. Such cooperation does not require all participating authorities to assume the performance of main contractual obligations, as long as there are commitments to contribute towards the cooperative performance of the public service in question. In addition, the implementation of the cooperation, including any financial transfers between the participating contracting authorities, should be governed solely by considerations relating to the public interest.