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| 2 minutes read

CMA continues its focus on digital markets with a call for evidence on the use of algorithms

On 19 January 2021, the CMA published its paper on the impact of algorithms on competition in digital markets requesting that market participants, academics and industry experts provide evidence and examples of industry practices that may give rise to competition or consumer concerns as well as identify specific issues with particular firms that the CMA could review and consider for future enforcement action. This comes as no surprise given the CMA’s well-known desire to broaden its scrutiny of and enforcement powers in digital markets with many of its findings anticipated in a previous publication from 2018.

The CMA’s concerns

Although the CMA acknowledges the benefits for consumers that can arise from algorithms, the CMA also recognises that algorithms can nevertheless have a negative impact for consumers:

  • personalisation – advertising different prices for the same product to different people including practices which achieve the same effect, such as providing discounts to selected customers. Whilst this can be beneficial (e.g. lowering search costs for consumers), use of algorithms could have a negative impact where there is insufficient competition or where pricing is complex or opaque;
  • discrimination – misuse of algorithms, whether direct or indirect, can result in illegal discrimination under UK equality law which the CMA recognises can be difficult to identify and penalise; and
  • unfair ranking and design – this involves using algorithmic systems for commercial advantage by modifying search result rankings or design features influencing what a consumer sees, e.g. search results being manipulated because higher commission payments are made for doing so, favouring its own products over competing options or through exploitation such as misleading scarcity messages.

The CMA also has concerns that algorithms have the potential to stabilise or facilitate collusion even without any explicit agreement or communication between companies. For example:

  • explicit coordination is a risk due to the increased availability of pricing data and the use of automated pricing systems which make it easier to detect and respond to deviations and reducing the chance of errors or accidental deviations;
  • hub-and-spoke coordination can arise where companies use the same algorithmic system to set prices, including by using the same third-party software or delegating pricing decisions to a common intermediary; and
  • the possibility of autonomous tacit collusion whereby pricing algorithms learn to collude without requiring other information sharing or existing coordination.

What next? 

In line with competition authorities across the globe, the CMA’s current enforcement strategy is undoubtedly being driven by a desire to tackle anticompetitive commercial practices within digital markets and it considers that there is a strong case for intervention in addressing the misuse of algorithms due to the potential for significant harm arising from exploiting consumers and excluding competitors.

In pursuing its mission to make digital markets work well for consumers, businesses and the economy, the CMA through its Digital Markets Unit due to be established later this year will work together with other regulators such as the Information Commissioner’s Office and Equalities and Human Rights Commission where appropriate. Likely activities specific to the use of algorithms include providing guidance to businesses, setting/clarifying standards, identifying and remedying existing harms through intelligence gathering as well as formal investigations into individual companies. 


competition law, cma, digital markets, algorithms, competition