Case T-851/14: Judgment of the General Court of 13 December 2018 — Slovak Telekom v Commission (Competition — Abuse of dominant position — Slovakian market for broadband telecommunications services — Access by third-party undertakings to the ‘local loop’ of the incumbent operator on that market — Decision finding an infringement of Article 102 TFEU and Article 54 of the EEA Agreement — Single and continuous infringement — Definition of ‘abuse’ — Refusal to grant access — Margin squeeze — Calculation of margin squeeze — Equally efficient competitor test — Rights of defence — Imputation of an infringement committed by a subsidiary to its parent company — Decisive influence of the parent company over the subsidiary’s commercial policy — Actual exercise of such influence — Burden of proof — Calculation of the fine — 2006 Guidelines on the method of setting fines)