An extract from The Dominance and Monopolies Review - 7th edition
Market definition and market power
In the Netherlands, the concepts of market definition and market power are applied in a manner that is substantially similar to the approach of the Commission and the EU courts; therefore, see the European Union chapter for more detailed information on European practice.i Market definition
As to market definition, the ACM and the courts tend to follow the principles embodied in the Commission's Notice on the definition of the relevant market and the standard jurisprudence of the EU courts.ii Market power
The definition of dominance is provided in Article 1(i) of the DCA and is modelled on the definition commonly applied in the EU, and as coined by the European Court of Justice (ECJ) in the United Brands case:
a position of one or more undertakings which enables them to prevent effective competition being maintained on the Dutch market or a part thereof, by giving them the power to behave to an appreciable extent independently of their competitors, their suppliers, their customers or end-users.
The methodologies and standards of proof employed in practice in determining whether a market position fits this definition of dominance also closely follow European practice. Market shares are considered an important indicator, although not decisive on their own. Additional factors have been taken into account, such as the existence of intellectual property rights, the level of concentration of the market and barriers to entry. In its 2017 ruling, the District Court of Amsterdam relied on the advice of three appointed experts for its conclusion that online real estate platform Funda held a dominant position on the online housing market in the Netherlands. According to the experts, the combination of Funda's strong position and the significant entry barriers to the Dutch online housing market enabled Funda to behave independently.
The ACM and the courts will normally also look for contraindications, such as countervailing power, when determining dominance.