Glossary of competition terms

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).


Request by a natural or legal person who claims a legitimate interest asking the Commission to investigate an alleged infringement of EU competition law and to bring it to an end. Formal complaints oblige the Commission to act (either to find that there is an infringement or to reject the complaint) and give the complainant certain procedural rights, like the right to be heard. Informal complaints (where a complainant refuses disclosure of the information he provides) or anonymous complaints may lead the Commission to open a case, but confer no rights to the complainant. © European Commission