[527]*527Mr. Justice White
delivered the opinion of the Court.
Alleging that Falstaff Brewing Corp.’s acquisition of the Narragansett Brewing Co. in 1965 violated § 7 of the Clayton Act, 38 Stat. 731, as amended, 15 U. S. C. § 18,1 the United States brought this antitrust suit under the theory that potential competition in the New England beer market may be substantially lessened by the acquisition. The District Court held to the contrary, 332 F. Supp. 970 (1971), and we noted probable jurisdiction2 to determine whether the trial court applied an erroneous legal standard in so deciding, 405 U. S. 952 (1972). We remand to the District Court for a proper assessment of Falstaff as a potential competitor.
As stipulated by the parties, the relevant product market is the production and sale of beer, and the six New England States3 compose the geographic market. While beer sales in New England increased approximately 9.5% in the four years preceding the acquisition, the eight largest sellers increased their share of these sales from approximately 74% to 81.2%. In 1960, approximately 50% of the sales were made by the four largest sellers; by 1964, their share of the market was 54%; and [528]*528by 1965, the year of acquisition, their share was 61.3%. The number of brewers operating plants in the geographic market decreased from 32 in 1935, to 11 in 1957, to six in 1964.4
Of the Nation’s 10 largest brewers in 1964, only Falstaff and two others did not sell beer in New England; Falstaff was the largest of the three and had the closest brewery.5 In relation to the New England market, Falstaff sold its product in western Ohio, to the west and in Washington, D. C., to the south.
The acquired firm, Narragansett, was the largest seller of beer in New England at the time of its acquisition, with approximately 20% of the market; had been the largest seller for the five preceding years; had constantly expanded its brewery capacity between 1960 and 1965; and had acquired either the assets or the trademarks of several smaller brewers in and around the geographic market.
The fourth largest producer of beer in the United States at the time of acquisition, Falstaff was a regional brewer6 with 5.9.% of the Nation’s production in 1964, having grown steadily since its beginning as a brewer in 1933 through acquisition and expansion of other breweries. As of January 1965, Falstaff sold beer in 32 States, but did not sell in the Northeast, an area composed of New England and States such as New York and New Jersey; the area being the highest beer consumption region in the [529]*529United States. Between 1955 and 1966, the company’s net sales and net income almost doubled, and in 1964 it was planning a 10-year, $35 million program to expand its existing plants.
Falstaff met increasingly strong competition in the 1960’s from four brewers who sold in all of the significant markets. National brewers possess competitive advantages since they are able to advertise on a nationwide basis, their beers have greater prestige than regional or local beers, and they are less affected by the weather or labor problems in a particular region. Thus Falstaff concluded that it must convert from “regional” to “national” status, if it was to compete effectively with the national producers.7 For several years Falstaff publicly expressed its desire for national distribution8 and after making several efforts in the early 1960’s to enter the Northeast by acquisition, agreed to acquire Narragansett in 1965.
Before the acquisition was accomplished, the United States brought suit9 alleging that the acquisition would violate § 7 because its effect may be to substantially lessen competition in the production and sale of beer in the New England market. This contention was based on two grounds: because Falstaff was a potential entrant [530]*530and because the acquisition eliminated competition that would have existed had Falstaff entered the market de novo or by acquisition and expansion of a smaller firm, a so-called “toe-hold” acquisition.10 The acquisition was completed after the Government's motions for injunctive relief were denied, and Falstaff agreed to operate Narragansett as a separate subsidiary until otherwise ordered by the court.
After a trial on the merits, the District Court found that the geographic market was highly competitive; that Falstaff was desirous of becoming a national brewer by entering the Northeast; that its management was committed against de novo entry; and that competition had not diminished since the acquisition.11 The District Court then held:
“The Government's contentions that Falstaff at the time of said acquisition was a potential entrant into said New England market, and that said acquisition deprived the New England market of additional competition are not supported by the evidence. On the contrary, the credible evidence establishes beyond a reasonable doubt that the executive management of Falstaff had consistently decided not to attempt to enter said market unless it could acquire a brewery with a strong and viable distribution system such as that possessed by Narragansett. Said executives had carefully considered such possible alternatives as (1) acquisition of a small brewery on the east coast, (2) the shipping of beer from its [531]*531existing breweries, the nearest of which was located in Ft. Wayne, Indiana, (3) the building of a new brewery on the east coast and other possible alternatives, but concluded that none of said alternatives would have effected a reasonable probability of a profitable entry for it in said New England market. In my considered opinion the plaintiff has failed to establish by a fair preponderance of the evidence that Falstaff was a potential competitor in said New England market at the time it acquired Narragansett. The credible evidence establishes that it was not a potential entrant into said market by any means or way other than by said acquisition. Consequently it cannot be said that its acquisition of Narragansett eliminated it as a potential competitor therein.’' 332 F. Supp., at 972.
Also finding that the Government had failed to establish that the acquisition would result in a substantial lessening of competition, the District Court entered judgment for Falstaff and dismissed the complaint.
I
Section 7 of the Clayton Act forbids mergers in any line of commerce where the effect may be substantially to lessen competition or tend to create a monopoly. The section proscribes many mergers between competitors in a market, United States v. Continental Can Co., 378 U. S. 441 (1964); Brown Shoe Co. v. United States, 370 U. S. 294 (1962); it also bars certain acquisitions of a market competitor by a noncompetitor, such as a merger by an entrant who threatens to dominate the market or otherwise upset market conditions to the detriment of competition, FTC v.
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[527]*527Mr. Justice White
delivered the opinion of the Court.
Alleging that Falstaff Brewing Corp.’s acquisition of the Narragansett Brewing Co. in 1965 violated § 7 of the Clayton Act, 38 Stat. 731, as amended, 15 U. S. C. § 18,1 the United States brought this antitrust suit under the theory that potential competition in the New England beer market may be substantially lessened by the acquisition. The District Court held to the contrary, 332 F. Supp. 970 (1971), and we noted probable jurisdiction2 to determine whether the trial court applied an erroneous legal standard in so deciding, 405 U. S. 952 (1972). We remand to the District Court for a proper assessment of Falstaff as a potential competitor.
As stipulated by the parties, the relevant product market is the production and sale of beer, and the six New England States3 compose the geographic market. While beer sales in New England increased approximately 9.5% in the four years preceding the acquisition, the eight largest sellers increased their share of these sales from approximately 74% to 81.2%. In 1960, approximately 50% of the sales were made by the four largest sellers; by 1964, their share of the market was 54%; and [528]*528by 1965, the year of acquisition, their share was 61.3%. The number of brewers operating plants in the geographic market decreased from 32 in 1935, to 11 in 1957, to six in 1964.4
Of the Nation’s 10 largest brewers in 1964, only Falstaff and two others did not sell beer in New England; Falstaff was the largest of the three and had the closest brewery.5 In relation to the New England market, Falstaff sold its product in western Ohio, to the west and in Washington, D. C., to the south.
The acquired firm, Narragansett, was the largest seller of beer in New England at the time of its acquisition, with approximately 20% of the market; had been the largest seller for the five preceding years; had constantly expanded its brewery capacity between 1960 and 1965; and had acquired either the assets or the trademarks of several smaller brewers in and around the geographic market.
The fourth largest producer of beer in the United States at the time of acquisition, Falstaff was a regional brewer6 with 5.9.% of the Nation’s production in 1964, having grown steadily since its beginning as a brewer in 1933 through acquisition and expansion of other breweries. As of January 1965, Falstaff sold beer in 32 States, but did not sell in the Northeast, an area composed of New England and States such as New York and New Jersey; the area being the highest beer consumption region in the [529]*529United States. Between 1955 and 1966, the company’s net sales and net income almost doubled, and in 1964 it was planning a 10-year, $35 million program to expand its existing plants.
Falstaff met increasingly strong competition in the 1960’s from four brewers who sold in all of the significant markets. National brewers possess competitive advantages since they are able to advertise on a nationwide basis, their beers have greater prestige than regional or local beers, and they are less affected by the weather or labor problems in a particular region. Thus Falstaff concluded that it must convert from “regional” to “national” status, if it was to compete effectively with the national producers.7 For several years Falstaff publicly expressed its desire for national distribution8 and after making several efforts in the early 1960’s to enter the Northeast by acquisition, agreed to acquire Narragansett in 1965.
Before the acquisition was accomplished, the United States brought suit9 alleging that the acquisition would violate § 7 because its effect may be to substantially lessen competition in the production and sale of beer in the New England market. This contention was based on two grounds: because Falstaff was a potential entrant [530]*530and because the acquisition eliminated competition that would have existed had Falstaff entered the market de novo or by acquisition and expansion of a smaller firm, a so-called “toe-hold” acquisition.10 The acquisition was completed after the Government's motions for injunctive relief were denied, and Falstaff agreed to operate Narragansett as a separate subsidiary until otherwise ordered by the court.
After a trial on the merits, the District Court found that the geographic market was highly competitive; that Falstaff was desirous of becoming a national brewer by entering the Northeast; that its management was committed against de novo entry; and that competition had not diminished since the acquisition.11 The District Court then held:
“The Government's contentions that Falstaff at the time of said acquisition was a potential entrant into said New England market, and that said acquisition deprived the New England market of additional competition are not supported by the evidence. On the contrary, the credible evidence establishes beyond a reasonable doubt that the executive management of Falstaff had consistently decided not to attempt to enter said market unless it could acquire a brewery with a strong and viable distribution system such as that possessed by Narragansett. Said executives had carefully considered such possible alternatives as (1) acquisition of a small brewery on the east coast, (2) the shipping of beer from its [531]*531existing breweries, the nearest of which was located in Ft. Wayne, Indiana, (3) the building of a new brewery on the east coast and other possible alternatives, but concluded that none of said alternatives would have effected a reasonable probability of a profitable entry for it in said New England market. In my considered opinion the plaintiff has failed to establish by a fair preponderance of the evidence that Falstaff was a potential competitor in said New England market at the time it acquired Narragansett. The credible evidence establishes that it was not a potential entrant into said market by any means or way other than by said acquisition. Consequently it cannot be said that its acquisition of Narragansett eliminated it as a potential competitor therein.’' 332 F. Supp., at 972.
Also finding that the Government had failed to establish that the acquisition would result in a substantial lessening of competition, the District Court entered judgment for Falstaff and dismissed the complaint.
I
Section 7 of the Clayton Act forbids mergers in any line of commerce where the effect may be substantially to lessen competition or tend to create a monopoly. The section proscribes many mergers between competitors in a market, United States v. Continental Can Co., 378 U. S. 441 (1964); Brown Shoe Co. v. United States, 370 U. S. 294 (1962); it also bars certain acquisitions of a market competitor by a noncompetitor, such as a merger by an entrant who threatens to dominate the market or otherwise upset market conditions to the detriment of competition, FTC v. Procter & Gamble Co., 386 U. S. 568, 578-580 (1967). Suspect also is the acquisition by a company not competing in the market but so situated [532]*532as to be a potential competitor and likely to exercise substantial influence on market behavior. Entry through merger by such a company, although its competitive conduct in the market may be the mirror image of that of the acquired company, may nevertheless violate § 7 because the entry eliminates a potential competitor exercising present influence on the market. Id., at 580-581; United States v. Penn-Olin Chemical Co., 378 U. S. 158, 173-174 (1964). As the Court stated in United States v. Penn-Olin Chemical Co., supra, at 174, “The existence of an aggressive, well equipped and well financed corporation engaged in the same or related lines of commerce waiting anxiously to enter an oligopolistic market would be a substantial incentive to competition which cannot be underestimated.' ’
In the case before us, Falstaff was not a competitor in the New England market, nor is it contended that its merger with Narragansett represented an entry by a dominant market force. It was urged, however, that Falstaff was a potential competitor so situated that its entry by merger rather than de novo violated § 7. The District Court, however, relying heavily on testimony of Falstaff officers, concluded that the company had no intent to enter the New England market except through acquisition and that it therefore could not be .considered a potential competitor in that market. Having put aside Falstaff as a potential de novo competitor, it followed for the District Court that entry by a merger would not adversely affect competition in New England.
The District Court erred as a matter of law. The error lay in the assumption that because Falstaff, as a matter of fact, would never have entered the market de novo, it could in no sense be considered a potential competitor. More specifically, the District Court failed to give separate consideration to whether Falstaff was a potential competitor in the sense that it was so posi[533]*533tioned on the edge of the market that it exerted beneficial influence on competitive conditions in that market.
A similar error was committed by the Court of Appeals in FTC v. Procter & Gamble Co., supra, where one of the reasons for the Commission’s finding the acquisition in violation of § 7 was that the merger eliminated Procter as a potential entrant, not because Procter would have entered independently, but because the acquisition eliminated the procompetitive effect Procter exerted from the fringe of the market. Id., at 575. The Court of Appeals struck down this finding because there was no evidence that Procter ever intended de novo entry, but we held the Commission’s finding was “amply supported by the evidence,” id., at 581, because the evidence “clearly show[ed] that Procter was the most likely entrant,” id., at 580, and it was “clear that the existence of Procter at the edge of the industry exerted considerable influence on the market,” id., at 581. Thus, the fact that Falstaff and its management had no intent to enter de novo, and would not have done so, does not ipso facto dispose of the potential-competition issue.
The specific question with respect to this phase of the case is not what Falstaff’s internal company decisions were but whether, given its financial capabilities and conditions in the New England market, it would be reasonable to consider it a potential entrant into that market. Surely, it could not be said on this record that Falstaff’s general interest in the New England market was unknown;12 and if it would appear to rational beer merchants in New England that Falstaff might well build a new brewery to supply the northeastern market then its entry by merger becomes suspect under § 7. The District Court should therefore have appraised the economic facts about Falstaff and the New England market [534]*534in order to determine whether in any realistic sense Falstaff could be said to be a potential competitor on the fringe of the market with likely influence on existing competition.13 This does not mean that the testimony [535]*535of company officials about actual intentions of the company is irrelevant or is to be looked upon with suspicion; but it does mean that theirs is not necessarily the last [536]*536word in arriving at a conclusion about how Falstaff should be considered in terms of its status as a potential entrant into the market in issue.
[537]*537Since it appears that the District Court entertained too narrow a view of Falstaff as a potential competitor and since it appears that the District Court’s conclusion that the merger posed no probable threat to competition followed automatically from the finding that Falstaff had no intent to enter de novo, we remand this case for. the District Court to make the proper assessment of Falstaff as a potential competitor.
II
Because we remand for proper assessment of Falstaff as an on-the-fringe potential competitor, it is not necessary to reach the question of whether § 7 bars a market-extension merger by a company whose entry into the market would have no influence whatsoever on the present state of competition in the market — that is, the entrant will not be a dominant force in the market and has no current influence in the marketplace. We leave for another day the question of the applicability of § 7 to a merger that will leave competition in the marketplace exactly as it was, neither hurt nor helped, and that is challengeable under § 7 only on grounds that the company could, but did not, enter de novo or through “toe-hold” acquisition and that there is less competition than there would have been had entry been in such a manner. There are traces of this view in our cases, see Ford Motor Co. v. United States, 405 U. S. 562, 567 (1972); id., at 587 (Burger, C. J., concurring in part and dissenting in part); FTC v. Procter & Gamble Co., 386 U. S., at 580; id., at 586 (Harlan, J., concurring); United States v. Penn-Olin Chemical Co., 378 U. S., at 173, but the Court has not squarely faced the question,14 if for no other reason than because there has [538]*538been no necessity to consider it. See Ford Motor Co. v. United States, supra; FTC v. Procter & Gamble Co., supra; United States v. Penn-Olin Chemical Co., supra; United States v. El Paso Natural Gas Co., 376 U. S. 651 (1964).
The judgment of the District Court dismissing the complaint against Falstaff is reversed, and the case is remanded for further proceedings consistent with this opinion.
So ordered.
Mr. Justice Brennan took no part in the decision of this case. Mr. Justice Powell took no part in the consideration or decision of this case.