This presentation by Aura García Pabón (OECD Competition Expert) was made during the discussion “Efficiencies in merger control” held during the 141st meeting of the OECD Working Party No. 3 on Co-operation and Enforcement on 17 June 2025. Access all related materials, including an OECD note and contributions from participating delegations at https://oe.cd/emctrl.