Abuse of dominance and monopolisation

What's new

Chess game symbolizing dominance

What is abuse of dominance o‌r monopolisation?

A firm’s ability to raise its prices is usually constrained by competitors and the possibility that its customers can switch to alternative sources of supply. When these constraints are weak, a firm is said to have market power and if the market power is great enough, to be in a position of dominance or monopoly (the precise terminology differs according to the jurisdiction). While mere possession of monopoly power does not in itself constitute violation of competition laws, the abuse of such power  - particularly if it is used to weaken competition further by excluding rivals - calls for intervention from competition authorities.


Detecting abuse of dominance

Determing when a firm’s behaviour is an abuse of market power, as opposed to a competitive action, is one of the most complex and controversial areas in competition  policy.  Competition laws typically contain provisions prohibiting abuse of market power by dominant firms or attempts of not yet dominant firms to monopolise markets.


However, there is considerable divergence among jurisdictions about the precise definition of dominance, the range of practices and conducts that should be condemned as anti-competitive, and finally the choice of remedies that should be imposed.

Examples of abusive practices typically include:

  • predatory pricing
  • loyalty rebates
  • tying and bundling
  • refusals to deal
  • margin squeeze
  • excessive pricing

‌A proper understanding of when a firm’s actions could be considered abusive is important for competition authorities because consumers’and the economy would be harmed by an incorrect intervention. A firm with a large market share, which might be considered dominant, also needs to understand the law and economics in this area, which is not always easy.


To promote effective enforcement of competition laws in the area of abuse of dominance and monopolisation, the OECD Competition Committee holds roundtable discussions, typically with the participation of businesses, academics and other interested participants.  As a result, Best Practice Roundtables proceedings are published to provide some guidance to best practices in this area, at the cutting edge of applied competition law and policy.

For further information on the OECD work related to abuse of dominance and monopolisation, please contact us at [email protected].


Documents and links

List of all roundtable on Abuse of Dominance


Latest roundtables on Abuse of Dominance

Safe harbours and legal presumptions in competition law, 2017

Competition issues in aftermarkets, 2017

Multi-sided markets: Rethinking the Use of Traditional Antitrust Enforcement Tools, 2017

Big data: Bringing competition policy to the digital era, 2016

Geographic market definition across national borders, 2016

Price discrimination, 2016

Commitment Decisions in Antitrust Cases, 2016

Fidelity rebates, 2016

Competition and cross platform parity agreements, 2015

Oligopoly Markets, 2015

OECD inventory of international co-operation agreements on competition, 2014

Enhanced Enforcement Co-operation, 2014 

Permanent URL:



» Competition Home Page


Abuse of dominance & monopolisation

Cartels & anti-competitive agreements

Digital Economy and innovation

Enforcement practices

Evaluation of competition interventions 

International co-operation

Liberalisation & intervention in regulated sectors

Market studies


Pro-competitive policy reforms  

Key materials, Tools & Guidance

Best practice roundtables

Calendar of activities

Competition assessment toolkit

Country reports & peer reviews

Fighting bid rigging in public procurement 


Reports by the Competition Committee

Reports by competition agencies

Global Relations

About global relations

Hungary centre

Korea centre

Global Forum on Competition


至尊百家乐走势图 江西多乐彩奖金规则 熊猫棋牌手机版app下载 波克棋牌老版 幸运pk10快艇 15选5开走势图 华人博彩论坛 nba全明星赛 20选8全中是多少钱 南京麻将30进园子群 一分快三技巧大小玩法 云南快乐十分开奖结果 天天红包赛历史记录 11选5上海 房卡麻将代理平台 加拿大快乐8网站 方大炭素股票行情走