The European Court of Justice issued an interesting judgment on the extent to which existing antitrust price-fixing principles can be applied to interactions between the administrator of a shared technology platform and its users. Specifically, in the Eturas case, the ECJ had to consider the extent to which users’ involvement in an anticompetitive concerted practice initiated by the system administrator of a shared IT platform may be inferred simply from the fact that the administrator sent messages to users concerning pricing and centrally implemented technical rules that affected how users could display their prices.
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