Monfort of Colorado, Inc. has brought this private antitrust action seeking to enjoin its competitor, Excel Corporation, a wholly owned subsidiary of Cargill, Inc. (hereinafter defendants or Excel), from acquiring another competitor, Spencer Beef Division of Land O’Lakes, Inc. Defendants appeal the district court’s grant of a permanent injunction prohibiting Excel from acquiring Spencer Beef.
See Monfort of Colorado, Inc. v. Cargill, Inc.,
Plaintiff Monfort packs and fabricates beef at plants in Greeley, Colorado, and Grand Island, Nebraska. It is the fifth largest beef packer in the country. Defendants Cargill and Excel operate four integrated beef packing and fabrication plants in Kansas, Missouri, and Texas, a slaughter facility in Nebraska, and a fabrication plant in Kansas. Excel is the second largest beef packer in the United States. Its parent company operates subsidiaries in at least thirty-five countries.
Spencer Beef, which Excel seeks to acquire, is a division of the agricultural cooperative Land O’Lakes, Inc. and was the third largest beef packer in the United States when all of its plants in Spencer, Iowa, Oakland, Iowa, and Schuyler, Nebraska were operating. Spencer’s Schuyler plant, which has been closed for more than two years,
Monfort brought this suit in July 1983, seeking an injunction under section 16 of the Clayton Act, 15 U.S.C. § 26. It claimed that Excel’s proposed acquisition of Spencer Beef would violate section 7 of the Clayton Act, 15 U.S.C. § 18, and section 1 of the Sherman Act, 15 U.S.C. § 1. This case presents the significant threshold issue of whether a company has standing to seek a section 16 injunction against its competí *573 tor’s horizontal acquisition of a competing firm. It also presents questions concerning the propriety of the proposed acquisition under section 7, as well as the propriety of a partial acquisition of assets once a district court has enjoined the originally proposed transaction. We find that Mon-fort has antitrust standing, that the district court properly granted Monfort’s request for an injunction, and that Excel’s subsequent acquisition of a Spencer Beef plant violated this injunction. Therefore, we affirm the district court’s judgments.
I
A
The threshold issue is whether Mon-fort has antitrust standing to challenge this merger. The landmark case governing analysis of antitrust standing is
Brunswick Corp. v. Pueblo Bowl-O-Mat, Inc.,
The antitrust claims in this case and in
Brunswick
involve both a remedial statute, section 16 or section 4, and a substantive statute defining the antitrust violation, section 7 of the Clayton Act. To obtain antitrust standing a plaintiff must meet the threshold requirements of both the remedial and substantive statutes. In
Brunswick
the Court observed that to recover section 4 damages for a section 7 violation a plaintiff must prove more than that defendant violated section 7.
See
*574
Therefore, when we consider
Brunswick’s
requirements for antitrust standing in this section 16 case, the Court’s concerns with restricting section 4 cases, in part because of the peculiar risks of unrestrained treble damages claims, are of little consequence.
See, e.g., id.
at 485-88,
In a section 16 case,
Brunswick
mandates only an inquiry into the causal connection between the threatened injury and the putative antitrust violation. If a plaintiff surmounts this causation hurdle it has standing to seek an injunction. Of course it still must satisfy section 16’s requirements in order to obtain the injunction,
2
and in the course of doing so it will have to prove a substantive antitrust violation such as the section 7 violation alleged here. The Supreme Court has said that this causation inquiry is like proximate cause analysis,
see Blue Shield,
B
Excel and Monfort are direct horizontal competitors in the beef packing and fabricating business. Excel contends that competitors generally should be denied standing to challenge a merger because they actually benefit from any increased concentration in the industry. Excel argues, in effect, that Monfort would have fewer competitors if the proposed merger were consummated and thus would accrue some of
*575
the advantages of oligopoly rather than suffer any antitrust injury. Excel also suggests that even if Monfort suffers from the merger it would only be suffering the effects of competition; it alludes to the statement, recently reaffirmed in
Brunswick,
that the “antitrust laws were enacted for ‘the protection of
competition,
not
competitors.’” Brunswick,
In support of its theory that the acquisition may injure competition, Monfort does not claim that consumers of beef will immediately be hurt by higher beef prices. Indeed, Monfort would surely benefit if beef prices rose following Excel’s acquisition. Instead Monfort claims that Excel will be able to engage in what we consider to be a form of predatory pricing in which Excel will drive other companies out of the market by paying more to its cattle suppliers and charging less for boxed beef that it sells to institutional buyers and consumers. The resulting cost-price squeeze will, according to Monfort, reduce its profit margin and drive it and other companies out of business. Once that occurs Excel will then use its market power to charge monopoly prices for its beef. Thus, according to Monfort, the harm to competition will follow an intense, but ersatz, period of competition during which Excel will increase its market share. Although Monfort does not discuss less drastic results, it is also possible that such a pricing strategy could enable Excel to demonstrate its price leadership to its competitors and force them to follow its artificially high boxed beef prices. Such a result would probably help Monfort but hurt competition by promoting tacit collusion. Monfort contends that Excel would be better able to engage in such a sustained period of predatory pricing if it possessed the additional market power that would come with increased market share following acquisition of Spencer Beef. Thus it claims that the harm to competition, as well as the injury it will suffer as a competitor, is directly tied to the putative Clayton Act section 7 violation.
Excel does not deny that such a pricing strategy could occur; instead it advances an economic theory, using Chicago School concepts, cf. Easterbrook, Predatory Strategies and Counterstrategies, 48 U.Chi.L.Rev. 263, 266 (1981) (“it is exceedingly hard to distinguish ‘predatory’ strategies from ordinary competition.”), which characterizes such pricing as pure competition. According to this theory, Excel would simply be using its superior skill, foresight and industry to increase its market share and drive inefficient competitors like Monfort from the marketplace.
Legal scholars have vigorously debated the nature and very existence of predatory pricing.
See, e.g.,
Easterbrook,
supra
(reviewing some of the recent theories and proposing own theory that if predation does occur, its harms are not worth policing). But the courts have continued to find that predatory pricing, when proved, violates the antitrust laws.
See, e.g., MCI Communications v. AT & T,
Our problem is made more difficult, however, because the predation in this ease is only threatened. We lack the ordinary guideposts such as marginal cost and average variable cost that might otherwise highlight a violation. Whether Monfort would suffer any injury from Excel's acquisition depends on how long Excel engaged in predatory pricing. If Excel did so only for a short time and did not drive Monfort out of business, Monfort would probably benefit from the likely decrease in price competition caused by Excel’s price leadership. But if Excel engaged in sustained predatory pricing Monfort and other companies could be driven out of business, the beef packing industry would become more concentrated, and it is likely that competition would be substantially lessened because of tacit collusion. Congress intended section 7 of the Clayton Act to prevent either circumstance; yet Monfort would only be harmed by sustained predatory pricing. 5 It is impossible to tell in advance of the acquisition which situation would occur, if either.
Monfort has alleged a plausible theory for how it may be injured by Excel’s putative section 7 violation. It is commonplace that Congress intended section 7 of the Clayton Act as “a prophylactic measure, intended ‘primarily to arrest apprehended consequences of intercorporate relationships before those relationships could work their evil____’”
Brunswick,
We recognize that special concerns do arise when competitors have the power to challenge each other’s corporate acquisitions. Competitors may invoke the pro-competitive goals of antitrust statutes yet intend to bring about anticompetitive results. For example, a company may want to block its competitor’s efficient acquisition despite FTC or Justice Department preclearance simply because the challenging company fears it will not be able to match its competitor’s newly acquired efficiencies such as economies of scale. Nevertheless, Congress created a private remedy for enforcing section 7 and hence apparently did not think that all private challenges would be spurious.
Excel contends, in effect, that all private challenges by competitors should be forbidden. Yet even the Justice Department ami-cus brief, filed in an unrelated suit, that it cites for support does not advocate this drastic position. 6 The Justice Department specifically said that it was “not suggesting that competitors never have standing to seek injunctive relief agáinst mergers or joint ventures involving their rivals.” Appellants’ Brief, Appendix at 14. It merely asked the court in that case to engage in searching scrutiny of private plaintiffs’ allegations of injury, aware that a govern *577 ment entity has authority to sue if the acquisition offends the public interest.
The Supreme Court apparently contemplates legitimate suits by competitors to challenge corporate acquisitions.
See Brunswick,
There have been relatively few instances of suits by competitors to enjoin acquisitions as being in violation of section 7 of the Clayton Act. But in all such cases that we have found the courts held that the competitor had standing under section 16.
7
See Cia. Petrolera Caribe, Inc. v. Arco Caribbean, Inc.,
Here we agree with the district court that injury to competition is threatened by the antitrust violation of which Monfort complains. In 1982 four firms apparently handled 52% of the input and 53.8% of the output of the relevant products in what the district court found to be the relevant geographic markets, and Excel’s acquisition of Spencer would give it 20.4% of the entire input and output markets. Although Monfort will only suffer antitrust injury if Excel abuses its market power, the causal connection will exist if the ultimate injury materializes. Therefore, we hold that Monfort has standing to
*578
seek an injunction that would block its competitor’s acquisition.
Cf. Christian Schmidt Brewing Co.,
II
Excel also objects to the district court’s resolution of the substantive issues in this case: its findings that a section 7 violation occurred and that a section 16 injunction was warranted. Excel contends that the district court incorrectly defined the product market and geographic market relevant to this acquisition. It also claims that the court should not have found that significant entry barriers exist; that the court failed to consider certain economic characteristics of the beef industry that constrain collusive behavior; and that the court should not have attributed any significance to Cargill’s extensive financial resources as Excel’s parent company.
A
The district court found that fed cattle constitute the relevant product within the input market.
The court defined the relevant product for the output market as all boxed beef produced either by independent fabricators or at integrated slaughter-fabrication facilities.
10
We review the district court’s definition of relevant markets under the clearly erroneous standard.
Telex Corp. v. IBM Corp.,
Excel would have preferred that the district court use the current Justice Department Merger Guidelines, 47 Fed.Reg. 28,-493 (1982),
revised,
49 Fed.Reg. 26,823 (1984), both to define relevant markets and to ascertain whether the acquisition will substantially lessen competition. We agree with the district court’s decision not to rely on these Guidelines.
See
B
In determining whether Excel’s proposed acquisition would violate section 7, the district court found that significant barriers restricted entry into the beef packing business.
Excel does not dispute the relevance of the inquiry into whether entry barriers exist; it merely contests the significance of the barriers in the beef packing industry. Here again, we review the district court’s findings under the clearly erroneous standard.
See United States v. General Dynamics Corp.,
The district court heard testimony that it would cost a potential competitor anywhere from $20 to $40 million to build an integrated beef packing and fabrication plant capable of competing with Monfort or Excel.
Excel objects to the district court’s analysis by offering its own view about the economic realities of the industry. It argues that the court misconceived the inquiry by examining existing entry barriers in what Excel repeatedly characterizes as “the current highly competitive beef industry.”
See
Appellants’ Brief at 38, 41, 42. Excel speculates now, despite its own internal documents, that there is a high rate of return on capital investments in the industry. It cites figures from
Fortune
magazine about Monfort’s present overall success. From these it infers that investments in new plants would also be profitable. It suggests, further, that collusion
*580
will quickly lead to supracompetitive rates of return, which will in turn break down any existing entry barriers. Excel refutes the court’s findings about the lack of available existing capacity by referring to its own expert’s testimony, testimony that the court noted but declined to heed.
See
We may not retry the case here on the basis of speculative arguments. Nothing in the record suggests to us that the court’s finding that entry barriers exist is clearly erroneous.
C
Excel also urges that the district court should have considered a variety of other factors that it contends would make collusion difficult or impossible. It argues, in effect, that when a court finds that a merger would significantly increase a firm’s market share in what is already a concentrated industry, the court should also look at specific competitive aspects of the particular industry to decide whether a large market share will readily translate into significant market power. Courts and scholars have disagreed on the relevance of such “other factors” to section 7 analysis. The current Merger Guidelines suggest that the Justice Department would examine these other' factors in a close case. See Merger Guidelines § 3.4, 49 Fed.Reg. at 26,832-34 (1984).
In
United States v. Philadelphia National Bank,
The Supreme Court in
United States v. General Dynamics Corp.,
Excel seeks to avail itself of the
General Dynamics
exception by arguing that future competitive behavior in the beef industry cannot be judged from past market behavior. It complains that the district court ignored expert testimony that: many buyers of beef are large and sophisticated; many substitutes exist for beef — such as poultry, pork and ground beef; cattle supplies are cyclical; individual plant costs differ widely; and high costs prohibit companies from maintaining excess unused production facilities. These factors do not establish that past information about the beef industry is inherently unreliable, nor do they resemble the factors such as long-term contracts that the Supreme Court found relevant in
General Dynamics.
Therefore, we hold that the district court properly confined its analysis to market share statistics plus limited information on industry structure, history and probable future.
See
D
Finally, Excel argues that the district court should not have attributed any significance to Cargill’s extensive financial resources as Excel’s parent company.
See
We need not rule on the continued validity of
Kennecott Copper
to affirm the district court’s approach. Even if we were to adopt the Second Circuit’s approach, Cargill’s deep pocket would still be relevant to Excel’s proposed acquisition. Although the district court conceded that predatory conduct was not certain to occur, it recognized that the threat of such predation was Monfort’s principal reason for trying to block the acquisition.
See
Ill
Finally, Excel appeals the district court’s order of February 27, 1984, holding that it violated the permanent injunction by acquiring Spencer Beef’s Oakland, Iowa, plant. The court required Excel to return the plant to Spencer; we denied Excel’s motion to stay that order.
Excel contends that it did not violate the spirit of the injunction by acquiring one of Spencer Beef’s three plants. It urges the court to consider the circumstances surrounding the injunction as well as the language of the order. 13 We note that by *582 taking control of the Oakland plant Excel acquired Spencer Beef’s only operating integrated beef packing and fabrication plant. Spencer’s other integrated plant in Schuyler, Nebraska, has been closed since 1982 except for a brief period following Excel’s take-over of the Oakland plant. 14
Excel’s claim that it was reasonable to acquire Spencer’s major operational asset despite the court’s injunction strains credulity. The court phrased its injunction to forbid the proposed acquisition that was the subject of the trial. But the court “further ENJOINED [defendants] from undertaking any plan or entering into any agreement, the effect of which would be to allow the acquisition, merger, consolidation, operation or in any other way permit the combination of the ownership or operation of the beef packing businesses” of Excel and Spencer Beef.
AFFIRMED.
Notes
. We also note that Professor Areeda’s law review article which apparently influenced much of the
Brunswick
analysis,
see, e.g.,
. Section 16 specifically refers to common law standards for equitable relief. Excel has not specifically objected to the district court’s finding that Monfort satisfied section 16’s requirements for impending harm.
See
The Sixth Circuit applied section 16 standards to determine the propriety of a preliminary injunction in a competitor's challenge to a merger when it, like we, concluded that the competitor had standing because causation between the antitrust violation and the injury had been shown.
See Christian Schmidt Brewing Co.,
. One possible argument against Monfort having antitrust standing here is that the harm it may suffer from the reopening of Spencer Beef’s Schuyler plant would occur regardless of which parent company reopened the plant. This, of course, was the basis for the Supreme Court’s dismissal of the
Brunswick
claims.
See
. This talismanic language is unhelpful here as it readily appears that Monfort’s harm as a competitor may be a subset of the overall harm to competition. We are not prepared to dismiss every case that presents harm to specific competitors. Indeed, we are looking for such harm as part of our standing inquiry.
. Monfort could argue that it would be hurt by Excel's price leadership even if it continues in business because it would be coerced from vigorously competing in a way that might expand its own market share. We are satisfied, however, that Monfort would reap substantial profits at least in the short term from an interdependent price structure because it and other firms could charge supracompetitive prices.
. The Justice Department filed its amicus brief in support of General Motors’ motion to dismiss the complaint for lack of standing in
Chrysler Corp. v. General Motors Corp.,
No. 84-115 (D.D.C.). The district court ultimately denied the motion to dismiss.
. Our decision in Pennzoil Co. v. Texaco, Inc., No. 84-1169 (10th Cir. Feb. 9, 1984), 1984-1 Trade Cas. f 65,896, is not to the contrary. In that case Pennzoil sought to enjoin Texaco’s merger with Getty Oil. The court affirmed the district court’s denial of injunctive relief, but the decision was not based on any judgment as to plaintiff’s antitrust standing. The court was simply analyzing whether plaintiff had satisfied the traditional requirements for injunctive relief such as a showing of a substantial likelihood of success on the merits; proof of irreparable harm; proof that the threatened injury outweighs the damage that an injunction would cause; and a showing that the injunction would not harm the public interest. These equitable concerns enter the analysis in a case such as the one we face here. But the court considers them at the stage when it determines whether a section 16 injunction is warranted for the section 7 violation; this occurs only after a plaintiff has met the causation requirement for antitrust standing.
In other section 7 cases courts have appeared to approve competitor antitrust standing.
See Arthur S. Langenderfer, Inc. v. S.E. Johnson Co.,
. Fed cattle are steers and heifers that have been fattened in a commercial feedlot for a period of 100 to 140 days.
. This market included Nebraska, South Dakota, southern Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kansas, eastern Colorado, Oklahoma, New Mexico, and the Texas panhandle.
. The term boxed beef refers to a process for cutting slaughtered cattle into parts which are then vacuum-packed and boxed for shipment. The term "fabricate” refers to the process whereby the slaughtered carcass is broken down. For further discussion of terms of art within the beef industry, see the district court’s discussion at
. Carcass beef is beef sold in entire carcass form to wholesalers, retailers and independent fabricators for fabrication. Appellants’ Brief at 38.
. Excel bolsters its argument that large capital costs do not present barriers to entry by citing the Areeda-Turner treatise. Yet Excel’s quotation selectively ignores the context, in which the treatise authors do conclude that capital costs may comprise barriers to entry. See II P. Aree-da & D. Turner, Antitrust Law f 409e at 303-05 (1978).
. The December 1, 1983, order provided that:
"ORDER
IT IS HEREBY ORDERED that defendants Excel Corporation and Cargill, Inc. are PERMANENTLY ENJOINED from consummating the proposed acquisition between Excel Corporation, Cargill, Inc., and the Spencer Beef Division of Land O’Lakes, Inc. The defendants are further ENJOINED from undertaking any plan or entering into any agreement, the effect of which would be to allow the acquisition, merger, consolidation, operation or in any other way permit the combination of the ownership or operation of the beef packing businesses of defendants and the Spencer Beef Division of Land O’Lakes, Inc. Judgment will enter for Plaintiff Monfort of Colorado on its claim for injunctive relief____”
. Excel advances a worthy purpose argument claiming that by purchasing only the Oakland plant it enabled Spencer Beef to reopen the Schuyler plant. This argument is as irrelevant here as it is to a determination of whether a section 7 violation occurred.
