All mergers, which are reported to The Сomission, are subjected to see if they would significantly prevent or block effective competition in the EU. The regulation prohibits mergers and acquisitions that would significantly reduce competition in the single market, for example, if they created dominant companies that can raise prices for consumers. Proposed mergers may be prohibited, if the parties involved in the merger are major competitors or if the merger otherwise would significantly weaken effective competition in the market, in particular by creating or strengthening the dominant player. The jurisprudence of the CFI/ECJ (97) states that the analysis is facilitated by looking at a certain number of criteria which are summarised in Annex II of the framework Directive, which has also been used by the Commission in applying the notion of collective dominance under the merger control Regulation. According to this Annex, ‘two or more undertakings can be found to be in a joint dominan