The Dominance and Monopolies Review: USA


The US Supreme Court has emphasised that the opportunity to attain a monopoly and reap its benefits encourages investment and innovation.2 Thus, possessing and exercising monopoly power does not violate US antitrust law 'unless it is accompanied by an element of anticompetitive conduct '.3 Unlike the competition laws of many other jurisdictions, therefore, US antitrust law does not recognise claims for abuses of dominance that merely exploit existing monopoly power, such as claims for excessive pricing. This difference in focus is reflected throughout the standards adopted in US law, as discussed below.

The US antitrust statute specific to monopolies is Section 2 of the Sherman Act, 15 USC Section 2. It provides that '[e]very person who shall monopolize, or attempt to monopolize, or combine or conspire with any other person or persons, to monopolize any part of the trade or commerce among the several States, or with foreign nations, shall be deemed guilty of a felony'. US law recognises three separate violations that arise under this statute:

  1. monopolisation, which requires monopoly power and anticompetitive conduct that helps to obtain or maintain that power;4
  2. attempted monopolisation, which requires a dangerous probability of achieving monopoly power, anticompetitive conduct that threatens to help achieve that power and a specific intent to monopolise;5 and
  3. conspiracy to monopolise, which requires a conspiracy, a specific intent to monopolise and an overt act in furtherance of that conspiracy.6

The Sherman Act can be enforced in civil actions through injunctions brought by the US Department of Justice (DOJ) and through private litigation, as detailed below.7

Other statutes also apply to the behaviour of monopolists. Most notable is Section 5 of the Federal Trade Commission (FTC) Act, 15 USC Section 45, which prohibits 'unfair methods of competition'. The FTC Act reaches all conduct covered by the Sherman Act and probably reaches more broadly.8 It can be enforced solely by the FTC through civil action for injunctions and prospective cease-and-desist orders.9

Many US states have analogous statutes that apply to monopolists. In addition, in certain industries, other regulations can also apply to and potentially limit monopolists.

Year in review

The past year was an active one, with the US antitrust agencies bringing several large monopolisation cases. The DOJ and state attorneys general filed three separate lawsuits against Google alleging monopolisation of general search and online advertising markets. The FTC sued Facebook alleging that it had monopolised the market for US personal social networking by acquiring Instagram and WhatsApp and imposing conditions on third-party developer use of Facebook APIs. Separately, the FTC lost its standard-essential patent lawsuit against Qualcomm with an appellate court reversing a lower court's finding of liability. The US antitrust agencies also have other ongoing monopolisation investigations, reportedly including an investigation against Amazon, that could lead to future monopolisation actions.

i The DOJ and state attorneys general sue Google alleging monopolisation of general search and online advertising markets

In October 2020, the DOJ and 11 state attorneys general alleged that Google had monopolised the market for general search through exclusionary agreements.10 The complaint challenged revenue-sharing agreements Google had with Apple and with Android device manufacturers and carriers to set Google as the default search provider for their devices. The complaint also alleged that Google made it more difficult for Android distributors to route searches to Google's competitors by entering 'antiforking agreements' that seek to maintain a uniform set of libraries and APIs across Android-based devices and pre-installation agreements that require a series of Google apps, where Google search is the default, to be installed and prominently placed on Android devices.

In December 2020, attorneys general from 35 states, Puerto Rico, Guam and the District of Columbia sued Google, also focusing on its dominance within the search market.11 This complaint incorporated the allegations in the DOJ complaint, but also alleged that (1) Google limited the interoperability of its Search Advertising 360 tool to make it more difficult for advertisers to work with competing search engines; and (2) Google had excluded 'vertical' search providers that provided search services for more specific purposes, such as online travel agencies providing search for travel, by restricting their ability to advertise on Google, excluding them from prime placement in Google search results, and requiring that they provide certain data to be included in general search results.

Separately, in December 2020, 10 state attorneys general sued Google, alleging it had monopolised the online advertising market.12 The complaint alleged that Google had tied Google's ad server to its other advertising products; refused to provide Google's YouTube and other inventory to competing ad exchanges; and excluded competition from simultaneous 'header bidding' among multiple advertising exchanges by introducing a header bidding alternative that favoured Google ad exchanges and giving Facebook an advantage in Google ad auctions in exchange for Facebook curtailing its header bidding initiatives.

ii FTC sues Facebook alleging monopolisation of US market for personal social networking through decade-old acquisitions

In January 2021, the FTC alleged that Facebook monopolised the US market for personal social networking by acquiring Instagram in 2012, acquiring WhatsApp in 2013 and requiring that third-party developers not use Facebook's APIs to compete with Facebook's core functionality or to connect Facebook to competing social networks.13 The FTC had previously reviewed both the Instagram and WhatsApp transactions and took no action. Although the DOJ and FTC sometimes challenge recently consummated transactions, particularly transactions that did not require pre-merger notification, this challenge revisits transactions that are nearly a decade old and were actively reviewed by an agency.

iii Appellate court rules against FTC and for Qualcomm in patent monopolisation case

In August 2020, the US Court of Appeals for the Ninth Circuit ruled against the FTC and in favour of Qualcomm and reversed the District Court for the Northern District of California's judgment in FTC v. Qualcomm, Inc.14 The District Court found that Qualcomm violated the antitrust laws by conditioning the supply of its modem chips on mobile phone manufacturers agreeing to a Qualcomm patent licence that paid royalties even when they used competitors' modem chips.15 The District Court held that this 'no licence, no chips' policy imposed an anticompetitive 'tax' on competing chips and was a refusal to deal. On appeal, the FTC declined to defend the lower court's decision under existing refusal to deal doctrine, but rather argued that Qualcomm's actions were anticompetitive under 'traditional Section 2 standards', in that they tended to 'impair the opportunities of rivals and . . . [did] not further competition on the merits'.16 Unusually, the DOJ intervened in the appeal, filing an amicus brief and appearing at oral argument in support of Qualcomm's position, consistent with the Trump DOJ's general support for patent holders over implementers.17

The Ninth Circuit panel found that Qualcomm had no duty to deal with rival chipset suppliers under Aspen Skiing.18 First, Qualcomm did not terminate a 'voluntary and profitable course of dealing' because it had not granted rival chipmakers exhaustive patent licences at any time after Qualcomm gained monopoly power. Second, Qualcomm's 'no licence, no chips' policy did not 'sacrifice short-term benefits in order to obtain higher profits in the long run from the exclusion of competition' and was justified as a means to avoid patent exhaustion.19 Third, Qualcomm's refusal to license patents to rivals was not anticompetitive because rivals could still practise the patents for free under Qualcomm's 'no licence, no problem' policy, and Qualcomm did offer licences to its rivals' original equipment manufacturer customers.20 The panel distinguished the Third Circuit's Broadcom v. Qualcomm decision – which held that a patent holder's deception of a standard setting organisation about the patent holder's intent to license on fair, reasonable and non-discriminatory (FRAND) terms could constitute anticompetitive conduct under Section 2 – because of a lack of evidence of 'intentional deception' on Qualcomm's part. Fourth, the panel held that Qualcomm's exclusivity rebates to Apple did not result in anticompetitive foreclosure because they foreclosed only one chipmaker, Intel, which the panel did not consider to be a viable supplier for much of the relevant period.21

The Ninth Circuit's opinion has been subjected to extensive criticism for misunderstanding the FTC's arguments about how rivals' costs were raised. However, the FTC declined to seek Supreme Court review.

Market definition and market power

Monopoly power is a prerequisite to bringing a monopolisation claim. Monopoly power is the ability to control prices or exclude competition.22 It can be proven through direct evidence of actual price increases or the exclusion of rivals. More typically, however, courts infer monopoly power from the combination of high market shares and entry barriers. Higher market shares are more likely to support the inference of monopoly power, and typically shares below 50 per cent cannot support that inference.23 But even a very high share does not automatically establish monopoly power.24

Monopoly power is not required for attempted monopolisation or conspiracy to monopolise claims. Attempted monopolisation instead requires only a 'dangerous probability' of achieving monopoly power, and thus can be sustained with a lesser showing of market power. A conspiracy to monopolise arguably requires no showing of market power at all, although cases alleging a conspiracy to monopolise in the absence of market power are relatively rare.

Inferring monopoly power requires measuring market shares, and thus requires defining a relevant market. Relevant markets have both product and geographic dimensions. Product markets are defined by looking at what products are reasonably interchangeable substitutes for one another.25 Geographic markets are defined by looking at what other geographies sellers operate in and buyers can turn to.26 One method that is often used to determine what products or geographies are in the market is to ask whether customers would substitute from one product or geography to another in response to a small price increase above competitive levels.27


i Overview

Monopolisation requires anticompetitive conduct that helps to obtain or maintain a monopoly. Obtaining or maintaining a monopoly through other means, such as 'superior product, business acumen or historic accident', is therefore not a violation.28

US courts and antitrust regulators have not established a definitive list of what conduct can be anticompetitive; nor have they adopted clear standards for distinguishing between pro-competitive and anticompetitive conduct. The DOJ did issue guidance on monopolisation in 2008, but withdrew it in May 2009.29 The Supreme Court has, however, clarified that where two-sided platforms (such as credit cards) are concerned, courts evaluating antitrust claims must consider the impact of the defendant's conduct on both sides of the market and indicated that pro-competitive effects on one side of the market might be able to justify some anticompetitive impacts on the other.30

The list below, although not exhaustive, discusses the most important types of potential anticompetitive conduct that courts and regulators have recognised could support a monopolisation claim.

ii Exclusionary abuses

Exclusionary pricing

Predatory pricing is charging low prices to try to drive competitors from the market. Because low prices are generally pro-competitive and beneficial to consumers, US law imposes rigorous requirements to sustain a predatory pricing claim. Specifically, a plaintiff must prove that the defendant's prices are below cost, and there is a 'dangerous probability' that – by raising its prices above competitive levels after driving competitors from the market – the defendant will recoup the losses it incurs by charging below-cost prices.31 The US Supreme Court has not specified the precise measure of cost that should be used in this analysis, although most lower courts have required pricing below some measure of incremental cost.

A price squeeze or margin squeeze is when a firm that is active in upstream and downstream markets charges high prices for the upstream input and low prices for the downstream product. The potential antitrust concern is that a downstream competitor that is not vertically integrated must therefore pay high prices for an input while charging low prices to compete downstream. However, US law does not recognise price-squeeze claims without either an upstream duty to deal with competitors or downstream predatory pricing.32

Exclusive dealing

Exclusive dealing can have many pro-competitive benefits, including encouraging investment by reducing uncertainty about future sales, encouraging relationship-specific investments, and encouraging better product promotion and related services. However, exclusive dealing can also have anticompetitive effects when it forecloses rivals from the market and impairs their competitiveness. Under US law, exclusive dealing cannot be anticompetitive unless it forecloses a 'substantial share' of the relevant market.33 What counts as 'substantial' is unsettled: some courts have suggested that foreclosure of 30 per cent or less may suffice, while others have suggested that 40 per cent to 50 per cent may be required.34 Courts have also suggested that the foreclosure required to sustain a claim may be somewhat lower where the defendant is a monopolist.35

Loyalty conditions are when a seller charges customers one price if the customer purchases a certain percentage of its needs of a product from the seller and a higher price if the customer does not. Loyalty conditions can pro-competitively reduce costs, shift risk in volatile industries, or lead to efficient contracting such as by encouraging promotional or marketing efforts. However, like exclusive dealing, they can also foreclose rivals and impair their competitiveness. US law on loyalty discounts is unsettled. Some courts have applied a predatory pricing analysis, finding loyalty conditions to be potentially anticompetitive only when the resulting price is below cost.36 Other courts have applied an exclusivity analysis, finding loyalty conditions to be potentially anticompetitive whenever they foreclose a substantial share of the market.37 Some courts and regulators may also focus on the loyalty condition's effect on the incremental price of a customer's 'contestable' share that it would be willing to switch to the defendant's rivals.38

Most-favoured nation (MFN) clauses provide that a customer will receive pricing or other terms as good as those that the seller offers other customers.39 MFNs can pro-competitively help buyers obtain low prices and can help prevent opportunism when one party makes relationship-specific investments. However, MFNs can also anticompetitively limit competition by preventing new entrants from obtaining prices as low as they otherwise would have. US case law on MFNs is relatively undeveloped. However, antitrust regulators have pursued enforcement actions against MFNs, most often in healthcare.40

Tying and bundling

Tying is when a supplier conditions its sale of one product (the tying product) on the customer purchasing another product (the tied product).41 Tying can be accomplished through an absolute refusal to sell the items separately or through a price difference between the bundle and the separate items if the difference is sufficiently large that most or all customers would purchase the bundle. Tying can pro-competitively lower costs or increase the value of the items to customers, improve quality or protect goodwill, and efficiently meter consumption. On the other hand, tying may anticompetitively allow a company with monopoly power in the tying product to increase its market power in the tied product, help it protect its monopoly power in the tying product or otherwise increase its monopoly profits. A successful tying claim requires that the tying and tied items be separate products. Items are deemed separate products when customers want to buy them separately and when offering them separately is possible and efficient.42 Additionally, tying requires that the defendant have market power in the tying product.43 More recent cases have recognised the potential pro-competitive benefits of tying, although some older precedents could be read to suggest that pro-competitive justifications are inadmissible in a tying case.44 Proving that a substantial share of the relevant market is foreclosed is not a requirement for a tying claim.

Bundling is when a supplier charges one price if a customer purchases two or more products together, but charges a higher price when the products are purchased separately. Bundling can pro-competitively lower costs or increase the value of the products to customers, but raises similar potential anticompetitive concerns as tying. Bundling can also be combined with loyalty conditions, such that obtaining a lower price requires that the customer buy a certain share of its needs across multiple products from a particular company. Similar to loyalty conditions, US case law on bundling is unsettled. Some courts have ruled that bundling cannot be anticompetitive unless it results in prices that are below 'an appropriate measure' of cost.45 In applying this cost-based test, some courts have used a 'discount attribution test' that applies the entire price 'discount' across all bundled products to the stand-alone price of the competitive product, and then compares the resulting price to the cost of the competitive product.46 Other courts have instead found that bundling can be potentially anticompetitive whenever it forecloses a substantial share of the market.47

Exclusionary product design – where a company designs its product in a way that makes it difficult for competitors to develop compatible or interoperable products – can raise similar concerns as tying. Although exclusionary product designs can in certain circumstances be actionable,48 antitrust laws encourage innovation, and US courts are generally reluctant to second-guess product design decisions.49 Unless the product design clearly has no benefits to customers, a court is relatively unlikely to sustain an exclusionary product design claim.

Refusal to deal

US law generally does not impose a duty to deal with competitors, because the possibility of obtaining monopoly power and the ability to exclude rivals encourages investment and innovation, and because setting the terms of dealing and monitoring would be administratively burdensome. However, in limited circumstances, a refusal to deal with rivals can be anticompetitive conduct. The cases where courts have found a duty to deal generally involve the defendant ceasing a prior, voluntary and profitable course of dealing with its rivals and the defendant dealing with rivals on different terms than with non-rivals (such as where the defendant refuses to sell a product to rivals that the defendant sells at retail).50 Even when other US regulations mandate dealing between competitors, US courts generally will not find an antitrust duty to deal.

iii Discrimination

Discriminatory pricing occurs when a seller charges different customers different prices for the same product. Unless the pricing is predatory, price discrimination alone is not anticompetitive conduct. However, a separate statute called the Robinson-Patman Act, which is not specific to monopolists, prohibits discriminatory pricing in the sale of commodities where the effect may be to reduce downstream competition between customers.51 This aspect of the Robinson-Patman Act has been widely criticised, and enforcement of it is relatively rare. Although the statute requires an effect on competition, US courts typically infer that effect from the fact of differential pricing.52 Discriminatory pricing is not prohibited by the Robinson-Patman Act if the sale does not involve commodities; if the customers do not compete with one another downstream; or if the price differential is justified by differential costs, an effort to meet competitors' pricing or changing conditions.53 The Robinson-Patman Act, therefore, does not prohibit price discrimination between final consumers, as they do not compete downstream.

iv Exploitative abuses

As noted, exercising monopoly power is generally legal under US law. US law therefore does not in general recognise exploitative abuses.

v Miscellaneous

A variety of other types of conduct can, in certain circumstances, support a monopolisation claim. A non-exhaustive list is discussed here.

Monopoly leveraging is using monopoly power in one market to gain an advantage in a second market. However, under US law, monopoly leveraging likely cannot support a monopolisation claim unless it involves some anticompetitive conduct (such as tying, exclusive dealing or a refusal to deal) and it helps the defendant obtain or maintain a monopoly in the second market (or creates a dangerous probability of doing so).54

Monopolisation claims have been brought against patent holders for abusing standard-setting processes. Such claims might be brought where the patent holder induces a standard-setting organisation to adopt a standard that includes its patents but either deceptively promises to license the patents on FRAND terms and reneges or fails to disclose the existence of its patents in the first place. The concern is that such abuses may result in monopoly pricing that otherwise could have been avoided. Some courts have allowed such claims to go forward, while others have suggested they do not constitute monopolisation.55 The FTC has also used Section 5 of the FTC Act to pursue enforcement actions against alleged abuses of the standard-setting process.56

Monopolisation claims can also be brought against companies that abuse government processes. For example, 'sham' litigation and other abuses of the litigation process can be monopolisation.57 Similarly, enforcing intellectual property rights obtained through fraud can be monopolisation.58 Other abuses of governmental processes are also possible,59 such as filing false citizen petitions with the FDA.60

'Reverse payment' settlements – that is, payments made by a branded drug manufacturer to a generic competitor as part of a patent settlement that can delay generic entry – can also be challenged as monopolisation in some situations.61 The FTC has pursued several enforcement actions against these types of settlements and there has also been private litigation.

Additionally, in extreme cases, more general tortious conduct can support a monopolisation claim. For example, one US court allowed a monopolisation claim when a defendant removed its rival's products and advertising from retail stores without permission.62

Mergers that help obtain or maintain a monopoly can constitute monopolisation, although mergers are typically challenged under Section 7 of the Clayton Act, 15 USC Section 18, which prohibits mergers that 'substantially . . . lessen competition' or 'tend to create a monopoly'.

Remedies and sanctions

Available remedies in monopolisation cases include injunctive relief and monetary damages.63 Civil fines are not available.

Both the US antitrust regulators and private plaintiffs can seek injunctive relief, a court order that either requires the defendant to take certain actions or prohibits the defendant from taking certain actions. Injunctive relief has multiple purposes, including stopping the anticompetitive conduct, reversing its anticompetitive effects and denying the defendant the fruits of that conduct.64 Courts have broad discretion to frame appropriate injunctive relief to achieve these goals. Appropriate relief may include structural remedies (such as dissolving or splitting the defendant or requiring divestitures) or behavioural remedies (such as prohibiting the defendant from engaging in certain activities in the future or requiring that the defendant grant rivals access to certain property). Moreover, injunctive relief can include monetary equitable remedies such as disgorgement (an order requiring the defendant give up supra-competitive profits related to the antitrust violation) or restitution (an order requiring that the defendant compensate victims for their losses). However, a plaintiff must show that the defendant is violating or is about to violate the law in order to obtain injunctive relief; simply showing past conduct and a likelihood of recurrence are insufficient.65

Private plaintiffs can seek monetary damages equal to three times their actual injury, plus litigation costs and reasonable attorneys' fees, as detailed below.66 US and state governments also can seek treble damages for injury to their own business or property (as can foreign governments, although they are usually limited to single damages).67 In addition, a US state can bring a parens patriae action seeking treble damages on behalf of its residents.68


Monopolisation enforcement principally occurs through government investigations by the US antitrust regulators, and court proceedings initiated by the US antitrust regulators, states or private plaintiffs.

Investigations by US antitrust regulators can start in a variety of ways, including the regulator's own initiative, complaints from private parties or requests from other governmental actors (e.g., Congress). The DOJ and the FTC can work voluntarily with the target of the investigation and third parties, or can use compulsory process, including subpoenas and 'civil investigative demands', to obtain documents, written responses to questions and witness testimony.69 Entities subjected to a compulsory process often seek to negotiate the scope of the discovery and sometimes seek to quash it,70 although in practice doing so is relatively difficult, particularly for a target of an investigation. An investigation can be dropped at any time, and that decision is unreviewable by a court. An investigation can also be resolved through settlement at any time. The DOJ, as an agency of the US executive branch, must obtain court approval of its settlements, while the FTC, as an independent administrative agency, must approve settlements by majority vote of the FTC Commissioners.

An investigation can also lead to litigation. The DOJ must pursue litigation in federal court, following the procedures described below. The FTC, by contrast, has its own administrative courts, with somewhat different procedures, followed first by an appeal to the Commission itself and then an appeal to a federal appellate court. The FTC can also bring lawsuits in federal court seeking equitable relief, but, as noted above, one recent case held that the FTC did not have authority to pursue equitable relief in federal court for conduct that was solely in the past.

Court proceedings in a monopolisation case are similar to court proceedings in other cases. US federal courts have exclusive jurisdiction to hear cases under the federal antitrust laws, although state courts can hear cases under state antitrust laws.71 Antitrust cases that seek monetary damages are generally tried before a jury, while antitrust cases that seek only injunctive relief are instead tried before a judge. A court case starts with the plaintiff filing a complaint laying out the allegations against the defendant. The defendant can move to dismiss a complaint on several grounds, most importantly that the allegations fail to state a plausible claim. If the case proceeds, parties engage in potentially wide-ranging discovery, including document production, written interrogatories, requests for admissions and depositions. After discovery, a party may move for summary judgment on some or all issues if no genuine dispute exists as to any material fact and, given the material facts, the party is entitled to judgment as a matter of law. During and after a trial, parties can again move for judgment as a matter of law. Adverse decisions can be appealed, although typically not until after a final judgment. In general, the parties are free to settle at any time during this process.

Both the US antitrust regulators and private plaintiffs can also seek preliminary relief prior to a full adjudication by moving for a temporary restraining order or preliminary injunction to stop the challenged conduct. Preliminary relief can only be obtained from a court. Whether preliminary relief is appropriate depends on balancing the likelihood each party will succeed on the merits with the harm to the defendant from granting the preliminary relief and the harm to the plaintiff and the public from not granting it. In general, preliminary relief is unusual in a monopolisation case.

Further, the DOJ offers a business review process and the FTC offers an advisory opinion process that may allow businesses to obtain guidance about the DOJ's or the FTC's present enforcement intentions as to certain conduct.72 Businesses must submit a written request to the DOJ or the FTC describing the conduct and provide documents and other information. The DOJ or the FTC typically will consider only requests related to proposed conduct (and thus typically will not consider requests related to conduct that is already ongoing), and they can decline to issue guidance. If the DOJ or the FTC responds, the response and request are made available publicly. The guidance is not legally binding, but in practice the DOJ and the FTC are unlikely to pursue enforcement action against a requesting party that relies on it (except in special circumstances, such as if the facts provided were inaccurate). The guidance also does not preclude private plaintiffs from challenging the proposed conduct.

Private enforcement

As explained above, private plaintiffs can and often do seek treble damages and injunctive relief in monopolisation cases. Private actions can be brought by individual plaintiffs or through an opt-out class action that adjudicates the claims of many similarly situated plaintiffs in a single lawsuit. Class actions have additional procedural requirements that must be satisfied.73 Often, antitrust actions are viewed as amenable to resolution on a class-wide basis because many of the relevant issues will be market-wide and thus common to the class. Still, procedural hurdles remain, including demonstrating that impact can be proven on a common basis.

Typically, monopolisation suits are brought either by customers alleging that they paid more because of the reduction in competition caused by the monopolisation or by competitors alleging that they made less profit because their ability to compete was impaired. In general, indirect purchasers cannot bring claims under US federal antitrust laws, although many states allow indirect purchasers to bring claims under state antitrust laws.74 Users of both sides of two-sided platforms are direct purchasers, regardless of who nominally pays the fee.75

To obtain damages, a private plaintiff must establish more than the antitrust violation itself: it must also show that it was injured, that the violation was a material cause of its injury, that its injury was sufficiently closely related to the violation and that its injury resulted from an anticompetitive effect of the violation. Finally, it must prove the amount of damages.

Conceptually, the appropriate measure of damages is the difference between the plaintiff's position in the actual world and what its position would have been in the but-for world without the challenged conduct. Establishing what would have happened in the but-for world is often difficult, so courts typically require plaintiffs to prove damages only with reasonable certainty. Plaintiffs can do so by offering a rough approximation, and in practice, they typically compare the actual world to a baseline unaffected by the challenged conduct (e.g., the same market before the challenged conduct began or a similar market where the challenged conduct never occurred). Increasingly, damages are modelled using econometric techniques.

To obtain an injunction, by contrast, a private plaintiff must generally show that monetary damages would not be an adequate remedy because it cannot prove the amount of damages with reasonable certainty. The forms of injunctive relief discussed above (including behavioural and structural remedies) are in theory available to private plaintiffs.

Private enforcement also interacts with public enforcement. Private plaintiffs can encourage the government to open an investigation. If the government brings a public enforcement action and obtains a favourable judgment, that may benefit private plaintiffs by precluding the defendant from re-litigating certain issues in future private actions by providing prima facie evidence of a violation under the antitrust statutes or under more general procedural principles governing preclusion.76 In contrast, if the government chooses not to bring an action, or if it brings an action and loses, that does not prevent a future private action. A settlement likewise does not prevent a future private action and, if entered before testimony is obtained, also cannot be used as prima facie evidence of a violation. In addition, regardless of whether the government decides to bring an action, private plaintiffs can often benefit from the fruits of a government investigation, such as the discovery that the government obtains. The statute of limitations for private actions can also be suspended by a government action.

Future developments

As the Biden administration begins to take shape, antitrust enforcement against high-technology firms and platform services is likely to continue to be a priority. In addition to the lawsuits described above, there have been antitrust investigations into other major tech firms, including, reportedly, Amazon, and the FTC is conducting a study into past non-reportable acquisitions by Google, Amazon, Apple, Facebook and Microsoft.77 President Biden has also appointed or nominated several aggressive critics of current antitrust enforcement to government positions.78

On 16 March 2021, the FTC announced plans to assemble an international working group focused on the anticompetitive effects of pharmaceutical mergers, citing 'skyrocketing drug prices and ongoing concerns about anticompetitive conduct in the industry'.79 The announcement also stated that the FTC intends to take an 'aggressive approach to tackling anticompetitive pharmaceutical mergers' going forward.

In July 2020, a bill in New York State was introduced to expand the scope of New York's state antitrust law.80 The proposed bill would, among other things, explicitly prohibit monopolisation and create a new 'abuse [of a] dominant position' claim. This abuse of dominance language mirrors the language used in Article 102 of the Treaty on the Functioning of the European Union81 and would likely encompass conduct that is not currently illegal under US antitrust law. The bill would also authorise class actions under New York antitrust law.


1 Kenneth S Reinker and Daniel Culley are partners and Eugene K Kim is an associate at Cleary Gottlieb Steen & Hamilton LLP.

2 See Verizon Communications Inc. v. Law Offices of Curtis V Trinko LLP, 540 US 398, 407 (2004).

3 id.

4 id.

5 See Spectrum Sports Inc v. McQuillan, 506 US 447, 456, 459 (1993).

6 See United States v. Yellow Cab Co, 332 US 218, 225–26 (1947).

7 Criminal sanctions are also theoretically available in monopolisation cases. In practice, however, the DOJ typically pursues criminal sanctions – which include fines and imprisonment – only for horizontal cartels that engage in plainly illegal activity, such as price fixing.

8 See FTC v. Cement Inst, 333 US 683, 691–94 (1948).

9 15 USC Sections 45, 53(b).

10 Complaint, United States v. Google LLC, No. 1:20-cv-03010 (DDC, 20 October 2020), available at

11 Complaint, Colorado v. Google LLC, No. 1:20-cv-03715 (DDC, 17 December 2020), available at

12 Complaint, Texas v. Google LLC, No. 4:20-cv-00957-SDJ (ED Tex, 16 December 2020), available at

13 Complaint, FTC v. Facebook Inc, No. 1:20-cv-03590-JEB (DDC, 13 January 2021), available at

14 FTC v. Qualcomm Inc, D.C. No. 19-16122 (Ninth Circuit, 11 August 2020) (Ninth Circuit Qualcomm Opinion), available at

15 Findings of Fact and Conclusions of Law, FTC v. Qualcomm Inc., No. 5:17-cv-00220 (ND Cal, 21 May 2019).

16 Ninth Circuit Qualcomm Opinion at 36.

17 Brief for the United States of America as Amicus Curiae in Support of Appellant and Vacatur, FTC v. Qualcomm Inc, No. 19-16122 (Ninth Circuit, 30 August 2019), available at

18 Ninth Circuit Qualcomm Opinion at 31–36.

19 id. at 34 (citing Aerotec Int'l Inc v. Honeywell Int'l Inc, 836 F.3d 1171, 1184 (Ninth Circuit 2016)).

20 id. at 36–40.

21 id. at 51–55.

22 See, for example, United States v. EI DuPont de Nemours & Co, 351 US 377, 391–92 (1956).

23 See, for example, Domed Stadium Hotel Inc. v. Holiday Inns Inc., 732 F 2d 480, 489 (Fifth Circuit 1984) ('Supreme Court cases, as well as cases from this court, suggest that absent special circumstances, a defendant must have a market share of at least fifty percent before he can be guilty of monopolization.').

24 US law does not recognise 'relative dominance' or 'collective dominance'.

25 See, for example, Brown Shoe Co v. United States, 370 US 294, 325 (1962); DuPont, 351 US at 395.

26 See, for example, Tampa Elec Co v. Nashville Coal Co, 365 US 320, 327–28 (1961).

27 cf Horizontal Merger Guidelines, US Dep't of Justice and the Federal Trade Commission Section 4.1.1 (19 August 2010) (describing similar approach in merger context using prevailing prices as baseline).

28 See, for example, United States v. Grinnell Corp, 384 US 563, 570–71 (1966).

29 Press release, US Dep't of Justice Office of Public Affairs, 'Justice Department Withdraws Report on Antitrust Monopoly Law' (11 May 2009), available at

30 Ohio v. American Express Co., 138 S. Ct. 2274 (2018).

31 See Brooke Group Ltd v. Brown & Williamson Tobacco Corp, 509 US 209, 222–24 (1993). In a predatory pricing claim based on price discrimination brought under the Robinson-Patman Act, 15 USC Section 13, a plaintiff must prove a 'reasonable prospect' of recoupment. id., at 224.

32 See Pacific Bell Telephone Co v. linkLine Communications Inc., 555 US 438 (2009).

33 Tampa Electric Co v. Nashville Coal Co, 365 US 320, 327 (1961).

34 Compare Twin City Sportservice Inc v. Charles O Finley & Co Inc, 676 F 2d 1291, 1298, 1304 (Ninth Circuit 1982) (finding substantial foreclosure where the defendant 'controlled 24 per cent' of the market), with Stop & Shop Supermarket Co v. Blue Cross & Blue Shield of RI, 373 F 3d 57, 68 (First Circuit 2004) (foreclosure is 'unlikely to be of concern where they are less than 30 or 40 per cent'), with United States v. Microsoft Corp, 253 F 3d 34, 70 (DC Circuit 2001) (en banc) ('roughly 40 per cent or 50 per cent share usually required' for an unreasonable restraint of trade claim).

35 See Microsoft, 253 F 3d at 70.

36 See, for example, Concord Boat Corp v. Brunswick Corp, 207 F 3d 1039, 1060–62 (Eighth Circuit 2000).

37 See, for example, LePage's Inc. v. 3M, 324 F 3d 141, 157–59 (Third Circuit 2003) (en banc).

38 See, for example, US Dep't of Justice, Competition and Monopoly: Single-Firm Conduct Under Section 2 of the Sherman Act 107 (2008) (now withdrawn).

39 For discussions of MFNs, see, for example, Baker, 'Vertical Restraints with Horizontal Consequences: Competitive Effects of “Most-Favored-Customer” Clauses', 64 Antitrust LJ 517 (1996); Salop & Scott Morton, 'Developing an Administrable MFN Enforcement Policy', 27(2) Antitrust Magazine 15 (2013).

40 See, for example, Complaint, United States v. Blue Cross Blue Shield of Michigan, No. 2:10-cv-14155-DPH-MKM (ED Mich 18 October 2010).

41 See Jefferson Parish Hospital v. Hyde, 466 US 2, 21 (1984).

42 See Eastman Kodak Co v. Image Technical Services Inc., 504 US 451, 462 (1992).

43 See Jefferson Parish, 466 US at 13–14.

44 See Ill Tool Works Inc. v. Independent Ink Inc., 547 US 28, 35 (2006).

45 See, for example, Cascade Health Solutions v. PeaceHealth, 515 F3d 883, 903 (Ninth Circuit 2008).

46 See id., at 906–08.

47 See, for example, LePage's Inc. v. 3M, 324 F 3d 141, 154–57 (Third Circuit 2003) (en banc).

48 See, for example, United States v. Microsoft Corp, 253 F 3d 34, 65 (DC Circuit 2001) (en banc); CR Bard Inc. v. M3 Systems Inc., 157 F 3d 1340, 1382 (Federal Circuit 1998).

49 See, for example, Berkey Photo Inc. v. Eastman Kodak Co, 603 F 2d 263, 286–87 (Second Circuit 1979).

50 See, for example, Verizon Communications Inc. v. Law Offices of Curtis V Trinko LLP, 540 US 398, 409–10 (2004); Aspen Skiing Co v. Aspen Highlands Skiing Corp, 472 US 585, 605–11 (1985).

51 15 USC Section 13.

52 See FTC v. Morton Salt Co, 334 US 37, 47 (1948).

53 15 USC Section 13(a), (b).

54 See Trinko, 540 US at 415 n. 4.

55 Compare Broadcom Corp v. Qualcomm Inc., 501 F 3d 297 (Third Circuit 2007) (allowing claim for breach of FRAND commitments), with Rambus Inc. v. FTC, 522 F 3d 456, 462 (DC Circuit 2008) (not allowing such a claim).

56 See, for example, In re Negotiated Data Solutions, File No. 051-0094, slip op at 2 (FTC 23 January 2008) (Statement of the Commission), available at

57 See, for example, Professional Real Estate Investors Inc. v. Columbia Pictures Industries Inc., 508 US 49, 60–61 (1993) (holding that sham litigation requires both objective and subjective baselessness); California Motor Transport Co v. Trucking Unlimited, 404 US 508 (1972) (allowing claims based on abuse of the litigation process through repetitive lawsuits).

58 See, for example, Walker Process Equip v. Food Mach & Chem Corp, 382 US 172 (1965).

59 Findings of Fact and Conclusions of Law, FTC v. AbbVie Inc., No. 2:14-cv-05151-HB (ED Pa 2018), available at

60 Complaint for Injunctive and Other Equitable Relief, FTC v. Reckitt Benckiser Group PLC, No. 1:19-CV-00028 (WD Va 2018), available at

61 See FTC v. Actavis, 133 S. Ct. 2223, 2227 (2013) (holding that reverse payment settlements 'can sometimes violate the antitrust laws').

62 See Conwood Co v. United States Tobacco Co, 290 F 3d 768, 783–84 (Sixth Circuit 2002).

63 As noted, criminal sanctions are theoretically available but not pursued in practice.

64 See, for example, United States v. United Shoe Mach Corp, 391 US 244, 250 (1968).

65 FTC v. Shire ViroPharma Inc, 917 F.3d 147 (Third Circuit 2019), available at

66 15 USC Section 15.

67 15 USC Section 15(b); 15a.

68 15 USC Section 15c.

69 See 15 USC Sections 46, 49, 57b-1; 15 USC Sections 1311–1314.

70 See 15 USC Section 1314(b); 16 CFR 2.7(d).

71 See General Investment Co v. Lake Shore & Mich S Ry Co, 260 US 261, 286–88 (1922).

72 See 16 CFR Sections 1.1–1.4; 28 CFR Section 50.6.

73 See Fed R Civ P 23.

74 See Illinois Brick Co v. Illinois, 431 US 720 (1977); California v. ARC America Corp, 490 US 93 (1989).

75 Apple Inc. v. Robert Pepper et al., 139 S. Ct. 1514 (2019).

76 See 15 USC Section 16(a).

77 Press release, Federal Trade Commission, 'FTC to Examine Past Acquisitions by Large Technology Companies' (11 February 2020), available at

78 David McLaughlin, Jennifer Jacobs and Naomi Nix, 'Biden Flashes Warning to Big Tech as Antitrust Team Takes Shape', Bloomberg (9 March 2021), available at

79 Press release, Federal Trade Commission, 'FTC Announces Multilateral Working Group to Build a New Approach to Pharmaceutical Mergers' (16 March 2021), available at

80 New York Senate Bill S8700A, available at

81 Consolidated Version of the Treaty on the Functioning of the European Union, Article 102, 9 May 2008.

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