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One of the key recommendations of the House Judiciary Committee’s antitrust report which seems to have bipartisan support (see Rep. Buck’s report) is shifting evidentiary burdens of proof to defendants with “monopoly power.” These recommended changes are aimed at helping antitrust enforcers and private plaintiffs “win” more. The result may well be more convictions, more jury verdicts, more consent decrees, and more settlements, but there is a cost. 

Presumption of illegality for certain classes of defendants unless they can prove otherwise is inconsistent with the American traditions of the presumption of innocence and allowing persons to dispose of their property as they wish. Forcing antitrust defendants to defend themselves from what is effectively a presumption of guilt will create an enormous burden upon them. But this will be felt far beyond just antitrust defendants. Consumers who would have benefited from mergers that are deterred or business conduct that is prevented will have those benefits foregone.

The Presumption of Liberty in American Law

The Presumption of Innocence

There is nothing wrong with presumptions in law as a general matter. For instance, one of the most important presumptions in American law is that criminal defendants are presumed innocent until proven guilty. Prosecutors bear the burden of proof, and must prove guilt beyond a reasonable doubt. Even in the civil context, plaintiffs, whether public or private, have the burden of proving a violation of the law, by the preponderance of the evidence. In either case, the defendant is not required to prove they didn’t violate the law.

Fundamentally, the presumption of innocence is about liberty. As William Blackstone put it in his Commentaries on the Law of England centuries ago: “the law holds that it is better that ten guilty persons escape than that one innocent suffer.” 

In economic terms, society must balance the need to deter bad conduct, however defined, with not deterring good conduct. In a world of uncertainty, this includes the possibility that decision-makers will get it wrong. For instance, if a mere allegation of wrongdoing places the burden upon a defendant to prove his or her innocence, much good conduct would be deterred out of fear of false allegations. In this sense, the presumption of innocence is important: it protects the innocent from allegations of wrongdoing, even if that means in some cases the guilty escape judgment.

Presumptions in Property, Contract, and Corporate Law

Similarly, presumptions in other areas of law protect liberty and are against deterring the good in the name of preventing the bad. For instance, the presumption when it comes to how people dispose of their property is that unless a law says otherwise, they may do as they wish. In other words, there is no presumption that a person may not use their property in a manner they wish to do so. The presumption is liberty, unless a valid law proscribes behavior. The exceptions to this rule typically deal with situations where a use of property could harm someone else. 

In contracts, the right of persons to come to a mutual agreement is the general rule, with rare exceptions. The presumption is in favor of enforcing voluntary agreements. Default rules in the absence of complete contracting supplement these agreements, but even the default rules can be contracted around in most cases.

Bringing the two together, corporate law—essentially the nexus of contract law and property law— allows persons to come together to dispose of property and make contracts, supplying default rules which can be contracted around. The presumption again is that people are free to do as they choose with their own property. The default is never that people can’t create firms to buy or sell or make agreements.

A corollary right of the above is that people may start businesses and deal with others on whatever basis they choose, unless a generally applicable law says otherwise. In fact, they can even buy other businesses. Mergers and acquisitions are generally allowed by the law. 

Presumptions in Antitrust Law

Antitrust is a generally applicable set of laws which proscribe how people can use their property. But even there, the presumption is not that every merger or act by a large company is harmful. 

On the contrary, antitrust laws allow groups of people to dispose of property as they wish unless it can be shown that a firm has “market power” that is likely to be exercised to the detriment of competition or consumers. Plaintiffs, whether public or private, bear the burden of proving all the elements of the antitrust violation alleged.

In particular, antitrust law has incorporated the error cost framework. This framework considers the cost of getting decisions wrong. Much like the presumption of innocence is based on the tradeoff of allowing some guilty persons to go unpunished in order to protect the innocent, the error cost framework notes there is tradeoff between allowing some anticompetitive conduct to go unpunished in order to protect procompetitive conduct. American antitrust law seeks to avoid the condemnation of procompetitive conduct more than it avoids allowing the guilty to escape condemnation. 

For instance, to prove a merger or acquisition would violate the antitrust laws, a plaintiff must show the transaction will substantially lessen competition. This involves defining the market, that the defendant has power over that market, and that the transaction would lessen competition. While concentration of the market is an important part of the analysis, antitrust law must consider the effect on consumer welfare as a whole. The law doesn’t simply condemn mergers or acquisitions by large companies just because they are large.

Similarly, to prove a monopolization claim, a plaintiff must establish the defendant has “monopoly power” in the relevant market. But monopoly power isn’t enough. As stated by the Supreme Court in Trinko:

The mere possession of monopoly power, and the concomitant charging of monopoly prices, is not only not unlawful; it is an important element of the free-market system. The opportunity to charge monopoly prices—at least for a short period— is what attracts “business acumen” in the first place; it induces risk taking that produces innovation and economic growth. To safeguard the incentive to innovate, the possession of monopoly power will not be found unlawful unless it is accompanied by an element of anticompetitive conduct.

The plaintiff must also prove the defendant has engaged in the “willful acquisition or maintenance of [market] power, as distinguished from growth or development as a consequence of a superior product, business acumen, or historical accident.” Antitrust law is careful to avoid mistaken inferences and false condemnations, which are especially costly because they “chill the very conduct antitrust laws are designed to protect.”

The presumption isn’t against mergers or business conduct even when those businesses are large. Antitrust law only condemns mergers or business conduct when it is likely to harm consumers.

How Changing Antitrust Presumptions will Harm Society

In light of all of this, the House Judiciary Committee’s Investigation of Competition in Digital Markets proposes some pretty radical departures from the law’s normal presumption in favor of people disposing property how they choose. Unfortunately, the minority report issued by Representative Buck agrees with the recommendations to shift burdens onto antitrust defendants in certain cases.

One of the recommendations from the Subcommittee is that Congress:

“codify[] bright-line rules for merger enforcement, including structural presumptions. Under a structural presumption, mergers resulting in a single firm controlling an outsized market share, or resulting in a significant increase in concentration, would be presumptively prohibited under Section 7 of the Clayton Act. This structural presumption would place the burden of proof upon the merging parties to show that the merger would not reduce competition. A showing that the merger would result in efficiencies should not be sufficient to overcome the presumption that it is anticompetitive. It is the view of Subcommittee staff that the 30% threshold established by the Supreme Court in Philadelphia National Bank is appropriate, although a lower standard for monopsony or buyer power claims may deserve consideration by the Subcommittee. By shifting the burden of proof to the merging parties in cases involving concentrated markets and high market shares, codifying the structural presumption would help promote the efficient allocation of agency resources and increase the likelihood that anticompetitive mergers are blocked. (emphasis added)

Under this proposal, in cases where concentration meets an arbitrary benchmark based upon the market definition, the presumption will be that the merger is illegal. Defendants will now bear the burden of proof to show the merger won’t reduce competition, without even getting to refer to efficiencies that could benefit consumers. 

Changing the burden of proof to be against criminal defendants would lead to more convictions of guilty people, but it would also lead to a lot more false convictions of innocent defendants. Similarly, changing the burden of proof to be against antitrust defendants would certainly lead to more condemnations of anticompetitive mergers, but it would also lead to the deterrence of a significant portion of procompetitive mergers.

So yes, if adopted, plaintiffs would likely win more as a result of these proposed changes, including in cases where mergers are anticompetitive. But this does not necessarily mean it would be to the benefit of larger society. 

Antitrust has evolved over time to recognize that concentration alone is not predictive of likely competitive harm in merger analysis. Both the horizontal merger guidelines and the vertical merger guidelines issued by the FTC and DOJ emphasize the importance of fact-specific inquiries into competitive effects, and not just a reliance on concentration statistics. This reflected a long-standing bipartisan consensus. The HJC’s majority report overturns this consensus by suggesting a return to the structural presumptions which have largely been rejected in antitrust law.

The HJC majority report also calls for changes in presumptions when it comes to monopolization claims. For instance, the report calls on Congress to consider creating a statutory presumption of dominance by a seller with a market share of 30% or more and a presumption of dominance by a buyer with a market share of 25% or more. The report then goes on to suggest overturning a number of precedents dealing with monopolization claims which in their view restricted claims of tying, predatory pricing, refusals to deal, leveraging, and self-preferencing. In particular, they call on Congress to “[c]larify[] that ‘false positives’ (or erroneous enforcement) are not more costly than ‘false negatives’ (erroneous non-enforcement), and that, when relating to conduct or mergers involving dominant firms, ‘false negatives’ are costlier.”

This again completely turns the ordinary presumptions about innocence and allowing people to dispose of the property as they see fit on their head. If adopted, defendants would largely have to prove their innocence in monopolization cases if their shares of the market are above a certain threshold. 

Moreover, the report calls for Congress to consider making conduct illegal even if it “can be justified as an improvement for consumers.” It is highly likely that the changes proposed will harm consumer welfare in many cases, as the focus changes from economic efficiency to concentration. 


The HJC report’s recommendations on changing antitrust presumptions should be rejected. The harms will be felt not only by antitrust defendants, who will be much more likely to lose regardless of whether they have violated the law, but by consumers whose welfare is no longer the focus. The result is inconsistent with the American tradition that presumes innocence and the ability of people to dispose of their property as they see fit. 

The FTC recently required divestitures in two merger investigations (here and here), based largely on the majority’s conclusion that

[when] a proposed merger significantly increases concentration in an already highly concentrated market, a presumption of competitive harm is justified under both the Guidelines and well-established case law.” (Emphasis added).

Commissioner Wright dissented in both matters (here and here), contending that

[the majority’s] reliance upon such shorthand structural presumptions untethered from empirical evidence subsidize a shift away from the more rigorous and reliable economic tools embraced by the Merger Guidelines in favor of convenient but obsolete and less reliable economic analysis.

Josh has the better argument, of course. In both cases the majority relied upon its structural presumption rather than actual economic evidence to make out its case. But as Josh notes in his dissent in In the Matter of ZF Friedrichshafen and TRW Automotive (quoting his 2013 dissent in In the Matter of Fidelity National Financial, Inc. and Lender Processing Services):

there is no basis in modern economics to conclude with any modicum of reliability that increased concentration—without more—will increase post-merger incentives to coordinate. Thus, the Merger Guidelines require the federal antitrust agencies to develop additional evidence that supports the theory of coordination and, in particular, an inference that the merger increases incentives to coordinate.

Or as he points out in his dissent in In the Matter of Holcim Ltd. and Lafarge S.A.

The unifying theme of the unilateral effects analysis contemplated by the Merger Guidelines is that a particularized showing that post-merger competitive constraints are weakened or eliminated by the merger is superior to relying solely upon inferences of competitive effects drawn from changes in market structure.

It is unobjectionable (and uninteresting) that increased concentration may, all else equal, make coordination easier, or enhance unilateral effects in the case of merger to monopoly. There are even cases (as in generic pharmaceutical markets) where rigorous, targeted research exists, sufficient to support a presumption that a reduction in the number of firms would likely lessen competition. But generally (as in these cases), absent actual evidence, market shares might be helpful as an initial screen (and may suggest greater need for a thorough investigation), but they are not analytically probative in themselves. As Josh notes in his TRW dissent:

The relevant question is not whether the number of firms matters but how much it matters.

The majority in these cases asserts that it did find evidence sufficient to support its conclusions, but — and this is where the rubber meets the road — the question remains whether its limited evidentiary claims are sufficient, particularly given analyses that repeatedly come back to the structural presumption. As Josh says in his Holcim dissent:

it is my view that the investigation failed to adduce particularized evidence to elevate the anticipated likelihood of competitive effects from “possible” to “likely” under any of these theories. Without this necessary evidence, the only remaining factual basis upon which the Commission rests its decision is the fact that the merger will reduce the number of competitors from four to three or three to two. This is simply not enough evidence to support a reason to believe the proposed transaction will violate the Clayton Act in these Relevant Markets.

Looking at the majority’s statements, I see a few references to the kinds of market characteristics that could indicate competitive concerns — but very little actual analysis of whether these characteristics are sufficient to meet the Clayton Act standard in these particular markets. The question is — how much analysis is enough? I agree with Josh that the answer must be “more than is offered here,” but it’s an important question to explore more deeply.

Presumably that’s exactly what the ABA’s upcoming program will do, and I highly recommend interested readers attend or listen in. The program details are below.

The Use of Structural Presumptions in Merger Analysis

June 26, 2015, 12:00 PM – 1:15 PM ET


  • Brendan Coffman, Wilson Sonsini Goodrich & Rosati LLP


  • Angela Diveley, Office of Commissioner Joshua D. Wright, Federal Trade Commission
  • Abbott (Tad) Lipsky, Latham & Watkins LLP
  • Janusz Ordover, Compass Lexecon
  • Henry Su, Office of Chairwoman Edith Ramirez, Federal Trade Commission

In-person location:

Latham & Watkins
555 11th Street,NW
Ste 1000
Washington, DC 20004

Register here.