The competition acquis covers both anti-trust and state aid control policies. It includes rules and procedures to fight anti-competitive behaviour by companies (restrictive agreements between undertakings and abuse of dominant position), to scrutinise mergers between undertakings, and to prevent governments from granting state aid which distorts competition in the internal market. Generally, the competition rules are directly applicable in the whole Union, and Member States must co-operate fully with the Commission in enforcing them.