• Antonina Yaholnyk

    Managing Partner, CLACIS

  • Anastasiia Zeleniuk

    Associate, CLACIS


Address: Leonardo Business Centre, A, B Entrance, 6th Floor, Office 606, 17/52 Khmelnitskogo Street, Kyiv, 01030, Ukraine

Tel.: +38 044 391 2021

E-mail: yaholnyk@clacis.com

Web-site: www.clacis.aom

CLACIS is a leading competition law advisory, which focuses on matters regarding competition law in Ukraine and regions. Both founding partner Antonina Yaholnyk and CLACIS have been highly recognized by such international and local legal directories like Chambers Europe, Legal 500 EMEA, Best Lawyers and ULF.


Antitrust Implications of Using Pricing Algorithms

Apricing algorithm can be defined as a computer procedure which, based on a set of rules, solves certain pricing tasks. Pricing algorithms can be of different sophistication levels: from simple ‘match the lowest price’ to self-learning algorithms with objectives such as profit ma­ximising to be set by user.1 Such programs enabled a rapid response to market changes, adjust prices and, therefore, optimise business rules.2 Pricing algorithms are widely used by online merchants such as airlines, hotels, travel agencies as well as within different online market places such as Amazon. However, pricing algorithms are used not only in online markets but also offline. For example, they can be used by supermarket chains by marking products with electronic tags allowing such retail networks to change prices more quickly and frequently.3

Use of pricing algorithms is not itself prohibited. However, in the last few years the widespread use of pricing algorithms has attracted the attention of antitrust authorities around the world. The main concern is that use of pricing algorithms can facilitate or create collusion between entities,4 which is explicitly prohibited by Article 6 of the Law of Ukraine On Protection of Economic Competition, EU and US antitrust laws as well as antitrust laws of other jurisdictions. This article will provide an overview of such issues, including explicit and tacit collusion.

Pricing Algorithms Facilitating Explicit Agreements

In recent years antitrust authorities have paid significant attention to the use of pricing algorithms to facilitate overt collusion. This means cases where business entities, after having explicitly agreed on the level of their prices, also agree on the use of certain price algorithms which will monitor and adjust their prices, or even when businesses use such algorithms to collude.5 The use of pricing algorithms can facilitate both horizontal and vertical collusion. For example, by simplifying detection of deviations, reducing  the chances of errors as well as reducing risks of agency slack.6

The first landmark case on pricing algorithms facilitating collusion was the Poster Cartel case decided by the US District Court of Northern California in 2015.7  In this case David Topkins, director of a company sel­ling posters online, was held liable for horizontal price fixing with other merchants on an Amazon platform.8 Having agreed with other merchants on the levels of prices and specific algorithms to be used, Mr. Topkins wrote a code for his company’s algorithm to set prices on the posters as they were agreed with other merchants.9 Later, in 2016 the same court found Trod Limited and its director, Daniel Aston, liable for a similar infringement.10 The latter case triggered the analogical Trod Ltd/GB Eye Ltd case in the UK where GB Eye Ltd submitted a leniency application to the UK Competition and Markets Authority acknowledging that it had agreed on its prices in the UK with Trod Ltd.11 Both merchants were using the repri­cing algorithm available on Amazon, which is to be adjusted by compete rules determined by each particular merchant.12 Such rules include, for example, decreasing price by x% for competing goods.13 The repricer allows the exclusion of prices of certain merchants from the algorithms by adding such merchants to the ignoring list.14 Thus, the two merchants had agreed between themselves not to compete on price and put each other in the ignoring list so that they do not undercut each other’s prices, which resulted in a price-fixing cartel.

At EU level the issue of pricing algorithms was considered by the Court of Justice of the EU in the E-TURAS case.15 E-TURAS, an online travel booking system, sent messages to its travel agents through the online system announcing technical restrictions to its pricing algorithm capping discounts at 3%.16 The Court of Justice confirmed that even though travel agencies did not formally respond to the message, the fact that they were aware of such message, did not distance themselves from it and have subsequently continued to use the system, so such agencies shall be liable for a price-fixing cartel.17

In 2018 the EU Commission also emphasised that pricing algorithms can also facilitate vertical price fixing, in particular, in maintaining resale prices. Thus, Asus, Denon & Marantz, Philips and Pioneer were fined for resale price maintenance, which was facilitated by the use of price comparison web-sites (which in their turn are based on pricing algorithms) and a special pricing program which helped a producer to trace pri­ces of online retailers, detect deviation and maintain a certain level of retail prices.18

Pricing Algorithms as Means of Tacit Collusion

It is also regarded that use of pricing algorithms can also lead to tacit collusion between entities. That is, concertation without any agreement to collude or use of pricing algorithms for this purpose.19 The main reason for such concerns is that extensive use of pricing algorithms can lead to increased market transparency, speed of price changes and calculation of optimal prices, which in unison create favou­rable market conditions for collusion.20 Tacit collusion through algorithms can take place in the following scenarios21:

1. Hub and spoke. Use of the same pri­cing algorithm by multiple market pla­yers can lead to a similar reaction to market developments and, as a result, a similar pricing pattern. Moreover, if such market pla­yers are aware of algorithms used by their competitors such use can lead to indirect exchange of information and coordination of pricing policies. The most sensitive hub and spoke scenario is when market pla­yers entrust their pricing policy to the same provider of algorithmic pricing services, which can lead to coordination by such an agent without the knowledge of market players just through collection of data and application of same pricing ­algorithm.22

2. Predictable agent. Use of simple pricing algorithms which react to market conditions in a certain predictable way. For example, ‘lowest price matching’ can lead to very transparent and predictable pricing. This can result in tacit collusion and parallel pricing.23

3. Autonomous algorithms. Where algorithms are sophisticated enough to learn by themselves they can tacitly coordinate prices. Thus, if a person instructs the algorithm with a profit maximizing objective, such an algorithm can, through the ‘trial and error’ rule, on its own figure out that the most profit mixing pricing is to align prices with those of competitors.24 Big data is an important factor for such situations. The more data that is available to an algorithm, the better the results that can be obtained. Data used by pricing algorithms can include, in particular, the prices of competitors, past pricing/profit/revenue data; individual customer information; market information such as competitors’ stock; external information such as weather patterns; or firms’ costs, such as production, storage and fulfilment.25

However, the mere fact that market players use the same algorithms is not enough to establish a fact of collusion and to date there have been no examples of such collusion. In order to prove tacit collusion, there must be an intention to collude, which is highly unlikely to be proved without direct communication.26 Moreover, most algorithms can be changed by users and it’s mostly impossible for market players to have the same algorithm settings without agreeing them.27 Therefore, any announcements or communication of name and particulars can lead to the fact of collusion being established.28

In the meantime, EU Commissioner Vestager noted that the fact that entities were not aware of collusive consequences of algorithms used by them would not let businesses get away from sanctions.29 Instead, she noted that businesses have an obligation to ensure that algorithms function properly and do not in any way violate antitrust laws by design.30 It appears that where a company applies an algorithm, it will be liable for any antitrust consequen­ces of use of such algorithm.31 Moreover, in other jurisdictions outside the EU, legislative bodies are already working on providing the legislative definition of a pri­cing algorithm and direct prohibition of collusion through use of pricing algorithms.

It’s worth mentioning here that use of pricing algorithms can also lead to issues of abuse of dominance and personalised pricing.

Personalised Pricing and Pricing Algorithms

Pricing algorithms can also be instruments of personalised pricing, the practice when businesses can use available data on customers to charge them different pri­ces.32 As of now there is no evidence of personalised pricing, but big data and sophisticated pricing algorithms can contribute to such practice.33 Personalised pricing can be an issue in case of explicit coordination between entities to engage in personalised pricing and even lead to exploitation of a joint dominant position by means of discrimination between customers.34

Dominance of Online Market Platforms

In some jurisdictions antitrust authorities are also concerned with the role of online market platforms and their possession of big data and algorithms used by merchants. It is regarded that online market platforms can be dominant if network effects that arise from the functioning of such platforms and respectively data possessed by such platforms are able to significantly affect conditions of marketing of products sold on such platforms or squeeze out merchants from the market.35



1 Competition and Markets Authority, ‘Pricing Algorithms: Economic working paper on the use
of algorithms to facilitate collusion and personalised pricing’ CMA94 8 October 2018 <https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/746353/Algorithms_econ_report.pdf> assessed 22 January 2019, paras 2.7-2.9.

2 CMA (n 1) para 2.7.

3 CMA (n 1) para 3.11.

4 CMA (n 1) paras 5.1-5.2.

5 CMA (n 1) para 5.4.

6 CMA (n 1) para 5.6.

7 US v Topkins [2015] <www.justice.gov/atr/case-document/file/628891/download> assessed 22 July 2019.

8 Ibid.

9 U.S. v. Daniel William Aston and Trod Limited [2016] <www.justice.gov/atr/file/840016/download> assessed 22 January 2019.

10 Trod Ltd/GB Eye Ltd (Case 50223) [2016] <https://assets.publishing.service.gov.uk/media/57ee7c2740f0b606dc000018/case-50223-final-non-confidential-infringement-decision.pdf> assessed 22 January 2019.

11 Ibid.

12 Ibid.para 3.85 — 3.87.

13 Ibid.

14 Ibid.

15 C-74/14 «Eturas» UAB and Others v Lietuvos Respublikos konkurencijos taryba [2016] ECLI:EU:C:2016:42 < http://curia.europa.eu/juris/liste.jsf?&num=C-74/14> assessed 22 January 2019.

16 Ibid.

17 Ibid paras 44-47.

18 See for example Asus (Case No 40465) [2018] <http://ec.europa.eu/competition/antitrust/cases/dec_docs/40465/40465_337_3.pdf> assessed 22 January 2019.

19 CMA (n 1) para 5.17

20 CMA (n 1) paras 5.25-5.29.

21 CMA (n 1) para 5.15; Ariel Ezrachi and Maurice Stucke, ‘Artificial Intelligence & Collusion: When Computers Inhibit Collusion’ (2015).

22 CMA (n 1) para 5.17.
23 ibid para 5.22.

24 ibid para 5.24.

25 Ibid para 2.23.

26 Ibid para 5.18; Arnold & Porter, ‘Pricing algorithms: Antitrust implications’ < https://www.arnoldporter.com/en/perspectives/publications/2018/04/pricing-algorithms-the-antitrust-implications> assess 22 January 2019

27 CMA (n 1) para 5.18.

28 Ibid.

29 Freshfields Bruckhaus Deringer, ‘Pricing algorithms: the digital collusion scenarios’ < https://www.freshfields.com/globalassets/our-thinking/campaigns/digital/mediainternet/pdf/freshfields-digital—pricing-algorithms—the-digital-collusion-scenarios.pdf> assessed 22 January 2019.
30 Ibid.

31 Ibid.

32 СMA (no 1) para 7.2.

33 СMA (no 1) para 7.12.

34 СMA (no 1) paras 7.31-7.34.

35 Draft (no 32)