Glossary of competition terms

This Glossary is based on definitions 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). Each term is enriched with references of EU and national case laws from the e-Competitions Bulletin and Concurrences Review.


Formal information which firms provide to the Commission under EU merger law in certain situations. The Merger Regulation obliges undertakings to notify any concentration of Community dimension to the Commission on the basis of form CO, normally within one week of the conclusion of the concentration agreement. The participating undertakings are not allowed to put the concentration into effect before its notification and before the Commission has declared it compatible with the common market. © European Commission