This Glossary matches the list of keywords used by Concurrences search engine. Each keyword is automatically updated by the most recent EU and national case laws from the e-Competitions Bulletin and Concurrences Review. The definitions are excerpt from DG COMP’s Glossary of terms used in EU competition policy (© European Union, 2002) and the OECD’s Glossary of industrial organisation economics and competition law (© OECD, 1993).

Coordinated effects

There are two main ways in which horizontal mergers may significantly impede effective competition, in particular by creating or strengthening a dominant position:

(a) by eliminating important competitive constraints on one or more firms, which consequently would have increased market power, without resorting to coor- dinated behaviour (non-coordinated effects);

(b) by changing the nature of competition in such a way that firms that previously were not coordinating their behaviour, are now significantly more likely to coor- dinate and raise prices or otherwise harm effective competition. A merger may also make coordination easier, more stable or more effective for firms which were coordinating prior to the merger (coordinated effects). © EUR Lex

On this topic see the e-Competitions special issue "Mergers and coordinated effects: An overview of EU and national case law"