Mr. Justice Stewart
delivered the opinion of the Court.
The question presented in this case is whether the petitioner, the Great Atlantic & Pacific Tea Co. (A&P), violated § 2 (f) of the Clayton Act, 38 Stat. 730, as amended by the Robinson-Patman Act, 49 Stat. 1526, 15 U. S. C. § 13 (f),1 by knowingly inducing or receiving illegal price discrimina-tions from the Borden Co. (Borden).
[72]*72The alleged violation was reflected in a 1965 agreement between A&P and Borden under which Borden undertook to supply “private label” milk to more than 200 A&P stores in a Chicago area that included portions of Illinois and Indiana. This agreement resulted from an effort by A&P to achieve cost savings by switching from the sale of “brand label” milk (milk sold under the brand name of the supplying dairy) to the sale of “private label” milk (milk sold under the A&P label).
To implement this plan, A&P asked Borden, its longtime supplier, to submit an offer to supply under private label certain of A&P’s milk and other dairy product requirements. After prolonged negotiations, Borden offered to grant A&P a discount for switching to private-label milk provided A&P would accept limited delivery service. Borden claimed that this offer would save A&P $410,000 a year compared to what it had been paying for its dairy products. A&P, however, was not satisfied with this offer and solicited offers from other [73]*73dairies. A competitor of Borden, Bowman Dairy, then submitted an offer which was lower than Borden's.2
At this point, A&P’s Chicago buyer contacted Borden’s chain store sales manager and stated: “I have a bid in my pocket. You [Borden] people are so far out of line it is not even funny. You are not even in the ball park.” When the Borden representative asked for more details, he was told nothing except that a $50,000 improvement in Borden’s bid “would not be a drop in the bucket.”
Borden was thus faced with the problem of deciding whether to rebid. A&P at the time was one of Borden’s largest customers in the Chicago area. Moreover, Borden had just invested more than $5 million in a new dairy facility in Illinois. The loss of the A&P account would result in underutilization of this new plant. Under these circumstances, Borden decided to submit a new bid which doubled the estimated annual savings to A&P, from $410,000 to $820,000. In presenting its offer, Borden emphasized to A&P that it needed to keep A&P’s business and was making the new offer in order to meet Bowman’s bid. A&P then accepted Borden’s bid after concluding that it was substantially better than Bowman’s.
I
Based on these facts, the Federal Trade Commission filed a three-count complaint against A&P. Count I charged that A&P had violated § 5 of the Federal Trade Commission Act by misleading Borden in the course of negotiations for the private-label contract, in that A&P had failed to inform Borden that its second offer was better than the Bowman bid.3 [74]*74Count II, involving the same conduct, charged that A&P had violated § 2 (f) of the Clayton Act, as amended by the Robinson-Patman Act, by knowingly inducing or receiving price dis-criminations from Borden. Count III charged that Borden and A&P had violated § 5 of the Federal Trade Commission Act by combining to stabilize and maintain the retail and wholesale prices of milk and other dairy products.
An Administrative Law Judge found, after extended discovery and a hearing that lasted over 110 days, that A&P had acted unfairly and deceptively in accepting the second offer from Borden and had therefore violated § 5 of the Federal Trade Commission Act as charged in Count I. The Administrative Law Judge similarly found that this same conduct had violated § 2 (f). Finally, he dismissed Count III on the ground that the Commission had not satisfied its burden of proof.
On review, the Commission reversed the Administrative Law Judge’s finding as to Count I. Pointing out that the question at issue was what amount of disclosure is required of the buyer during contract negotiations, the Commission held that the imposition of a duty of affirmative disclosure would be “contrary to normal business practice and, we think, contrary to the public interest.” Despite this ruling, however, the Commission held as to Count II that the identical conduct on the part of A&P had violated § 2 (f), finding that Borden had discriminated in price between A&P and its competitors, that the discrimination had been injurious to competition, and that A&P had known or should have known that it was the beneficiary of unlawful price discrimination.4 The Commission rejected A&P’s defenses that the Borden bid had been made to meet competition and was cost justified.5
[75]*75A&P filed a petition for review of the Commission’s order in the Court of Appeals for the Second Circuit. The court held that substantial evidence supported the findings of the Commission and that as a matter of law A&P could not successfully assert a meeting-competition defense because it, unlike Borden, had known that Borden’s offer was better than Bowman’s.6 Finally, the court held that the Commission had correctly determined that A&P had no cost-justification defense. 557 F. 2d 971. Because the judgment of the Court of Appeals raises important issues of federal law, we granted certiorari. 435 U. S. 922.
II
The Robinson-Patman Act was passed in response to the problem perceived in the increased market power and coercive practices of chainstores and other big buyers that threatened [76]*76the existence of small independent retailers. Notwithstanding this concern with buyers, however, the emphasis of the Act is in §2 (a), which prohibits price discriminations by sellers. Indeed, the original Patman bill as reported by Committees of both Houses prohibited only seller activity, with no mention of buyer liability.7 Section 2 (f), making buyers liable for inducing or receiving price discriminations by sellers, was the product of a belated floor amendment near the conclusion of the Senate debates.8
As finally enacted, § 2 (f) provides:
“That it shall be unlawful for any person engaged in commerce, in the course of such commerce, knowingly to induce or receive a discrimination in price which is prohibited by this section.” (Emphasis added.)
Liability under § 2 (f) thus is limited to situations where the price discrimination is one “which is prohibited by this section.” While the phrase “this section” refers to the entire § 2 of the Act, only subsections (a) and (b) dealing with seller liability involve discriminations in price. Under the plain meaning of § 2 (f), therefore, a buyer cannot be liable if a prima facie case could not be established against a seller or if the seller has an affirmative defense. In either situation, there is no price discrimination “prohibited by this section.” 9 [77]
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Mr. Justice Stewart
delivered the opinion of the Court.
The question presented in this case is whether the petitioner, the Great Atlantic & Pacific Tea Co. (A&P), violated § 2 (f) of the Clayton Act, 38 Stat. 730, as amended by the Robinson-Patman Act, 49 Stat. 1526, 15 U. S. C. § 13 (f),1 by knowingly inducing or receiving illegal price discrimina-tions from the Borden Co. (Borden).
[72]*72The alleged violation was reflected in a 1965 agreement between A&P and Borden under which Borden undertook to supply “private label” milk to more than 200 A&P stores in a Chicago area that included portions of Illinois and Indiana. This agreement resulted from an effort by A&P to achieve cost savings by switching from the sale of “brand label” milk (milk sold under the brand name of the supplying dairy) to the sale of “private label” milk (milk sold under the A&P label).
To implement this plan, A&P asked Borden, its longtime supplier, to submit an offer to supply under private label certain of A&P’s milk and other dairy product requirements. After prolonged negotiations, Borden offered to grant A&P a discount for switching to private-label milk provided A&P would accept limited delivery service. Borden claimed that this offer would save A&P $410,000 a year compared to what it had been paying for its dairy products. A&P, however, was not satisfied with this offer and solicited offers from other [73]*73dairies. A competitor of Borden, Bowman Dairy, then submitted an offer which was lower than Borden's.2
At this point, A&P’s Chicago buyer contacted Borden’s chain store sales manager and stated: “I have a bid in my pocket. You [Borden] people are so far out of line it is not even funny. You are not even in the ball park.” When the Borden representative asked for more details, he was told nothing except that a $50,000 improvement in Borden’s bid “would not be a drop in the bucket.”
Borden was thus faced with the problem of deciding whether to rebid. A&P at the time was one of Borden’s largest customers in the Chicago area. Moreover, Borden had just invested more than $5 million in a new dairy facility in Illinois. The loss of the A&P account would result in underutilization of this new plant. Under these circumstances, Borden decided to submit a new bid which doubled the estimated annual savings to A&P, from $410,000 to $820,000. In presenting its offer, Borden emphasized to A&P that it needed to keep A&P’s business and was making the new offer in order to meet Bowman’s bid. A&P then accepted Borden’s bid after concluding that it was substantially better than Bowman’s.
I
Based on these facts, the Federal Trade Commission filed a three-count complaint against A&P. Count I charged that A&P had violated § 5 of the Federal Trade Commission Act by misleading Borden in the course of negotiations for the private-label contract, in that A&P had failed to inform Borden that its second offer was better than the Bowman bid.3 [74]*74Count II, involving the same conduct, charged that A&P had violated § 2 (f) of the Clayton Act, as amended by the Robinson-Patman Act, by knowingly inducing or receiving price dis-criminations from Borden. Count III charged that Borden and A&P had violated § 5 of the Federal Trade Commission Act by combining to stabilize and maintain the retail and wholesale prices of milk and other dairy products.
An Administrative Law Judge found, after extended discovery and a hearing that lasted over 110 days, that A&P had acted unfairly and deceptively in accepting the second offer from Borden and had therefore violated § 5 of the Federal Trade Commission Act as charged in Count I. The Administrative Law Judge similarly found that this same conduct had violated § 2 (f). Finally, he dismissed Count III on the ground that the Commission had not satisfied its burden of proof.
On review, the Commission reversed the Administrative Law Judge’s finding as to Count I. Pointing out that the question at issue was what amount of disclosure is required of the buyer during contract negotiations, the Commission held that the imposition of a duty of affirmative disclosure would be “contrary to normal business practice and, we think, contrary to the public interest.” Despite this ruling, however, the Commission held as to Count II that the identical conduct on the part of A&P had violated § 2 (f), finding that Borden had discriminated in price between A&P and its competitors, that the discrimination had been injurious to competition, and that A&P had known or should have known that it was the beneficiary of unlawful price discrimination.4 The Commission rejected A&P’s defenses that the Borden bid had been made to meet competition and was cost justified.5
[75]*75A&P filed a petition for review of the Commission’s order in the Court of Appeals for the Second Circuit. The court held that substantial evidence supported the findings of the Commission and that as a matter of law A&P could not successfully assert a meeting-competition defense because it, unlike Borden, had known that Borden’s offer was better than Bowman’s.6 Finally, the court held that the Commission had correctly determined that A&P had no cost-justification defense. 557 F. 2d 971. Because the judgment of the Court of Appeals raises important issues of federal law, we granted certiorari. 435 U. S. 922.
II
The Robinson-Patman Act was passed in response to the problem perceived in the increased market power and coercive practices of chainstores and other big buyers that threatened [76]*76the existence of small independent retailers. Notwithstanding this concern with buyers, however, the emphasis of the Act is in §2 (a), which prohibits price discriminations by sellers. Indeed, the original Patman bill as reported by Committees of both Houses prohibited only seller activity, with no mention of buyer liability.7 Section 2 (f), making buyers liable for inducing or receiving price discriminations by sellers, was the product of a belated floor amendment near the conclusion of the Senate debates.8
As finally enacted, § 2 (f) provides:
“That it shall be unlawful for any person engaged in commerce, in the course of such commerce, knowingly to induce or receive a discrimination in price which is prohibited by this section.” (Emphasis added.)
Liability under § 2 (f) thus is limited to situations where the price discrimination is one “which is prohibited by this section.” While the phrase “this section” refers to the entire § 2 of the Act, only subsections (a) and (b) dealing with seller liability involve discriminations in price. Under the plain meaning of § 2 (f), therefore, a buyer cannot be liable if a prima facie case could not be established against a seller or if the seller has an affirmative defense. In either situation, there is no price discrimination “prohibited by this section.” 9 [77]*77The legislative history of § 2 (f) fully confirms the conclusion that buyer liability under § 2 (f) is dependent on seller liability under § 2 (a) .10
The derivative nature of liability under § 2 (f) was recognized by this Court in Automatic Canteen Co. of America v. FTC, 346 U. S. 61. In that case, the Court stated that even if the Commission has established a prima facie case of price discrimination, a buyer does not violate § 2 (f) if the lower prices received are either within one of the seller’s defenses or not known by the buyer not to be within one of those defenses. The Court stated:
“Thus, at the least, we can be confident in reading the words in § 2 (f), 'a discrimination in price which is prohibited by this section/ as a reference to the substantive prohibitions against discrimination by sellers defined elsewhere in the Act. It is therefore apparent that the discriminatory price that buyers are forbidden by § 2 (f) to induce cannot include price differentials that are not forbidden to sellers in other sections of the Act .... For we are not dealing simply with a ‘discrimination in price’; the ‘discrimination in price’ in § 2 (f) must be one ‘which is prohibited by this section.’ Even if any price differential were to be comprehended within the term ‘discrimination in price,’ § 2 (f), which speaks of prohibited discriminations, cannot be read as declaring out of bounds price differentials within one or more of the ‘defenses’ available to sellers, such as that the price differentials [78]*78reflect cost differences, fluctuating market conditions, or bona fide attempts to meet competition, as those defenses are set out in the provisos of §§ 2 (a) and 2 (b).” 346 IT. S., at 70-71 (footnotes omitted).
The Court thus explicitly recognized that a buyer cannot be held liable under § 2 (f) if the lower prices received are justified by reason of one of the seller’s affirmative defenses.
Ill
The petitioner, relying on this plain meaning of § 2 (f) and the teaching of the Automatic Canteen case, argues that it cannot be hable under § 2 (f) if Borden had a valid meeting-competition defense. The respondent, on the other hand, argues that the petitioner may be liable even assuming that Borden had such a defense. The meeting-competition defense, the respondent' contends, must in these circumstances be judged from the point of view of the buyer. Since A&P knew for a fact that the final Borden bid beat the Bowman bid, it was not entitled to assert the meeting-competition defense even though Borden may have honestly believed that it was simply meeting competition. Recognition of a meeting-competition defense for the buyer in this situation, the respondent argues, would be contrary to the basic purpose of the Robinson-Patman Act to curtail abuses by large buyers.
A
The short answer to these contentions of the respondent is that Congress did not provide in § 2 (f) that a buyer can be liable even if the seller has a valid defense. The clear language of § 2 (f) states that a buyer can be liable only if he receives a price discrimination “prohibited by this section.”' If a seller has a valid meeting-competition defense, there is simply no prohibited price discrimination.
A similar attempt to amend the Robinson-Patman Act judicially was rejected by this Court in FTC v. Simplicity Pattern [79]*79Co., 360 U. S. 55. There the Federal Trade Commission had found that a manufacturer of dress patterns had violated § 2 (e) of the Clayton Act, as amended by the Robinson-Patman Act, by providing its larger customers services and facilities not offered its smaller customers.11 The manufacturer attempted to defend against this charge by asserting that there had been no injury to competition and that its dis-criminations in services were cost justified. Since liability under § 2 (e), unlike § 2 (a), does not depend upon competitive injury or the absence of a cost-justification defense, the manufacturer’s primary argument was that “it would be 'bad law and bad economics’ to make discriminations unlawful even where they may be accounted for by cost differentials or where there is no competitive injury.” 360 U. S., at 67 (footnote omitted). The Court rejected this argument. Recognizing that “this Court is not in a position to review the economic wisdom of Congress,” the Court stated that “[w]e cannot supply what Congress has studiously omitted.” Ibid. (footnote omitted). The respondent’s attempt in the present case to rewrite § 2 (f) to hold a buyer liable even though there is no discrimination in price “prohibited by this section” must be rejected for the same reason.12
[80]*80B
In the Automatic Canteen case, the Court warned against interpretations of the Robinson-Patman Act which “extend beyond the prohibitions of the Act and, in so doing, help give rise to a price uniformity and rigidity in open conflict with the purposes of other antitrust legislation.” 346 U. S., at 63. Imposition of § 2 (f) liability on the petitioner in this case would lead to just such price uniformity and rigidity.13
In a competitive market, uncertainty among sellers will-cause them to compete for business by offering buyers lower prices. Because of the evils of collusive action, the Court has held that the exchange of price information by competitors violates the Sherman Act. United States v. Container Corp., 393 U. S. 333. Under the view advanced by the respondent, however, a buyer, to avoid liability, must either refuse a seller’s bid or at least inform him that his bid has beaten competition. Such a duty of affirmative disclosure would almost inevitably frustrate competitive bidding and, by reducing uncertainty, lead to price matching and anticompetitive cooperation among sellers.14
Ironically, the Commission itself, in dismissing the charge under § 5 of the Federal Trade Commission Act in this case, recognized the dangers inherent in a duty of affirmative disclosure:
“The imposition of a duty of affirmative disclosure, applicable to a buyer whenever a seller states that his offer is [81]*81intended to meet competition, is contrary to normal business practice and, we think, contrary to the public interest.
“We fear a scenario where the seller automatically attaches a meeting competition caveat to every bid. The buyer would then state whether such bid meets, beats, or loses to another bid. The seller would then submit a second, a third, and perhaps a fourth bid until finally he is able to ascertain his competitor’s bid.” 87 F. T. C. 1047, 1050-1051.
The effect of the finding that the same conduct of the petitioner violated § 2 (f), however, is to impose the same duty of affirmative disclosure which the Commission condemned as anticompetitive, “contrary to the public interest,” and “contrary to normal business practice,” in dismissing the charge under § 5 of the Federal Trade Commission Act. Neither the Commission nor the Court of Appeals offered any explanation for this apparent anomaly.
As in the Automatic Canteen case, we decline to adopt a construction of § 2 (f) that is contrary to its plain meaning and would lead to anticompetitive results. Accordingly, we hold that a buyer who has done no more than accept the lower of two prices competitively offered does not violate § 2 (f) provided the seller has a meeting-competition defense.15
[82]*82IY
Because both the Commission and the Court of Appeals proceeded on the assumption that a buyer who accepts the lower of two competitive bids can be liable under § 2 (f) even if the seller has a meeting-competition defense, there was not a specific finding that Borden did in fact have such a defense. But it quite clearly did.
The test for determining when a seller has a valid meeting-competition defense is whether a seller can “show the existence of facts which would lead a reasonable and prudent person to believe that the granting of a lower price would in fact meet the equally low price of a competitor.” FTC v. A. E. Staley Mfg. Co., 324 U. S. 746, 759-760. “A good-faith belief, rather than absolute certainty, that a price concession is being offered to meet an equally low price offered by a competitor is sufficient to satisfy the § 2 (b) defense.” United [83]*83States v. United States Gypsum Co., 438 U. S. 422, 453.16 Since good faith, rather than absolute certainty, is the touchstone of the meeting-competition defense, a seller can assert the defense even if it has unknowingly made a bid that in fact not only met but beat his competition. Id., at 454.
B
Under the circumstances of this case, Borden did act reasonably and in good faith when it made its second bid. The petitioner, despite its longstanding relationship with Borden, was dissatisfied with Borden’s first bid and solicited offers from other dairies. The subsequent events are aptly described in the opinion of the Commission:
“Thereafter, on August 31, 1965, A&P received an offer from Bowman Dairy that was lower than Borden’s August 13 offer. On or about September 1, 1965, Elmer Schmidt, A&P’s Chicago unit buyer, telephoned Gordon Tarr, Borden’s Chicago chain store sales manager, and stated, T have a bid in my pocket. You [Borden] people are so far out of line it is not even funny. You are not even in the ball park.’ Although Tarr asked Schmidt for some details, Schmidt said that he could not tell Tarr anything except that a $50,000 improvement in Borden’s bid 'would not be a drop in the [bucket].’ Contrary to its usual practice, A&P then offered Borden the oppor[84]*84tunity to submit another bid.” 87 F. T. C., at 1048 (Footnotes and record citations omitted.)
Thus, Borden was informed by the petitioner that it was in danger of losing its A&P business in the Chicago area unless it came up with a better offer. It was told that its first offer was “not even in the ball park” and that a $50,000 improvement “would not be a drop in the bucket.” In light of Borden’s established business relationship with the petitioner, Borden could justifiably conclude that A&P’s statements were reliable and that it was necessary to make another bid offering substantial concessions to avoid losing its account with the petitioner.
Borden was unable to ascertain the details of the Bowman bid. It requested more information about the bid from the petitioner, but this request was refused. It could not then attempt to verify the existence and terms of the competing offer from Bowman without risking Sherman Act liability. United States v. United States Gypsum Co., supra. Faced with a substantial loss of business and unable to find out the precise details of the competing bid, Borden made another offer stating that it was doing so in order to meet competition. Under these circumstances, the conclusion is virtually inescapable that in making that offer Borden acted in a reasonable and good-faith effort to meet its competition, and therefore was entitled to a meeting-competition defense.17
[85]*85Since Borden had a meeting-competition defense and thus could not be liable under § 2 (b), the petitioner who did no more than accept that offer cannot be liable under § 2 (f).18
Accordingly, the judgment is reversed.
It is so ordered.
Mr. Justice Stevens took no part in the consideration or decision of this case.