delivered the opinion of the Court.
This case requires that we decide whether a per se violation of § 1 of the Sherman Act, 15 U. S. C. § 1, occurs when a cooperative buying agency comprising various retailers expels a member without providing any procedural means for *286 challenging the expulsion. 1 The case also raises broader questions as to when per se antitrust analysis is appropriately applied to joint activity that is susceptible of being characterized as a concerted refusal to deal.
I
Because the District Court ruled on cross-motions for summary judgment after only limited discovery, this case comes to us on a sparse record. Certain background facts are undisputed. Petitioner Northwest Wholesale Stationers is a purchasing cooperative made up of approximately 100 office supply retailers in the Pacific Northwest States. The cooperative acts as the primary wholesaler for the retailers. Retailers that are not members of the cooperative can purchase wholesale supplies from Northwest at the same price as members. At the end of each year, however, Northwest distributes its profits to members in the form of a percentage rebate on purchases. Members therefore effectively purchase supplies at a price significantly lower than do nonmembers. 2 Northwest also provides certain warehousing facilities. The cooperative arrangement thus permits the participating retailers to achieve economies of scale in purchasing and warehousing that would otherwise be *287 unavailable to them. In fiscal 1978 Northwest had $5.8 million in sales. App. 73.
Respondent Pacific Stationery & Printing Co. sells office supplies at both the retail and wholesale levels. Its total sales in fiscal 1978 were approximately $7.6 million; the record does not indicate what percentage of revenue is attributable to retail and what percentage is attributable to wholesale. Pacific became a member of Northwest in 1958. In 1974 Northwest amended its bylaws to prohibit members from engaging in both retail and wholesale operations. See id,., at 50, 59. A grandfather clause preserved Pacific’s membership rights. See id., at 59. In 1977 ownership of a controlling share of the stock of Pacific changed hands, id., at 70, and the new owners did not officially bring this change to the attention of the directors of Northwest. This failure to notify apparently violated another of Northwest’s bylaws. See id., at 59 (Bylaws, Art. VIII, §5).
In 1978 the membership of Northwest voted to expel Pacific. Most factual matters relevant to the expulsion are in dispute. No explanation for the expulsion was advanced at the time, and Pacific was given neither notice, a hearing, nor any other opportunity to challenge the decision. Pacific argues that the expulsion resulted from Pacific’s decision to maintain a wholesale operation. See Brief in Opposition 11. Northwest contends that the expulsion resulted from Pacific’s failure to notify the cooperative members of the change in stock ownership. See Pet. for Cert. 8. The minutes of the meeting of Northwest’s directors do not definitively indicate the motive for the expulsion. App. 75-77. It is undisputed that Pacific received approximately $10,000 in rebates from Northwest in 1978, Pacific’s last year of membership. Beyond a possible inference of loss from this fact, however, the record is devoid of allegations indicating the nature and extent of competitive injury the expulsion caused Pacific to suffer.
*288 Pacific brought suit in 1980 in the United States District Court for the District of Oregon alleging a violation of § 1 of the Sherman Act. The gravamen of the action was that Northwest’s expulsion of Pacific from the cooperative without procedural protections was a group boycott that limited Pacific’s ability to compete and should be considered per se violative of § 1. See Complaint ¶ 8, App. 4-5. On cross-motions for summary judgment the District Court rejected application of the per se rule and held instead that rule-of-reason analysis should govern the case. Finding no anti-competitive effect on the basis of the record as presented, the court granted summary judgment for Northwest. See App. to Pet. for Cert. 22-24.
The Court of Appeals for the Ninth Circuit reversed, holding “that the uncontroverted facts of this case support a finding of
per se
liability.”
We granted certiorari to examine this application of
Silver
v.
New York Stock Exchange, supra,
in an area of antitrust law that has not been free of confusion.
3
II
The decision of the cooperative members to expel Pacific was certainly a restraint of trade in the sense that every commercial agreement restrains trade.
Chicago Board of Trade
v.
United States,
This
per se
approach permits categorical judgments with respect to certain business practices that have proved to be predominantly anticompetitive. Courts can thereby avoid the “significant costs” in “business certainty and litigation efficiency” that a full-fledged rule-of-reason inquiry entails.
Arizona
v.
Maricopa County Medical Society,
This Court has long held that certain concerted refusals to deal or group boycotts are so likely to restrict competition without any offsetting efficiency gains that they should be condemned as
per se
violations of § 1 of the Sherman Act. See
Klor’s, Inc.
v.
Broadway-Hale Stores, Inc.,
A
The Court of Appeals drew from
Silver
v.
New York Stock Exchange,
The Court in Silver framed the issue as follows:
“[WJhether the New York Stock Exchange is to be held liable to a nonmember broker-dealer under the antitrust laws or regarded as impliedly immune therefrom when, pursuant to rules the Exchange has adopted under the Securities Exchange Act of 1934, it orders a number of its members to remove private direct telephone wire connections previously in operation between their offices and those of the nonmember, without giving the nonmember notice, assigning him any reason for the action, or affording him an opportunity to be heard.” Id., at 343.
Because the New York Stock Exchange occupied such a dominant position in the securities trading markets that the boycott would devastate the nonmember, the Court concluded that the refusal to deal with the nonmember would amount to a per se violation of § 1 unless the Securities Exchange Act provided an immunity. Id., at 347-348. The question for the Court thus was whether effectuation of the policies of the Securities Exchange Act required partial repeal of the Sherman Act insofar as it proscribed this aspect of exchange self-regulation.
*292 Finding exchange self-regulation — including the power to expel members and limit dealings with nonmembers — to be an essential policy of the Securities Exchange Act, the Court held that the Sherman Act should be construed as having been partially repealed to permit the type of exchange activity at issue. But the interpretive maxim disfavoring repeals by implication led the Court to narrow permissible self-policing to situations in which adequate procedural safeguards had been provided.
“Congress . . . cannot be thought to have sanctioned and protected self-regulative activity when carried out in a fundamentally unfair manner. The point is not that the antitrust laws impose the requirement of notice and a hearing here, but rather that, in acting without according petitioners these safeguards in response to their request, the Exchange has plainly exceeded the scope of its authority under the Securities Exchange Act to engage in self-regulation.” Id., at 364 (footnote omitted).
Thus it was the specific need to accommodate the important national policy of promoting effective exchange self-regulation, tempered by the principle that the Sherman Act should be narrowed only to the extent necessary to effectuate that policy, that dictated the result in Silver.
Section 4 of the Robinson-Patman Act is not comparable to the self-policing provisions of the Securities Exchange Act. That section is no more than a narrow immunity from the price discrimination prohibitions of the Robinson-Patman Act itself. The Conference Report makes clear that the exception was intended solely to “safeguard producer and consumer cooperatives against any charge of violation of the act based on their distribution of earnings or surplus among their members on a patronage basis.” H. R. Conf. Rep. No. 2951, 74th Cong., 2d Sess., 9 (1936) (emphasis added). This section has never been construed as granting cooperatives a blanket exception from the Robinson-Patman Act and cannot plausibly be construed as an exemption to or *293 repeal of any portion of the Sherman Act. 5 “There is nothing in the last section of the bill [containing §“4] that distinguishes cooperatives, either favorably or unfavorably, from other agencies in the streams of production and trade, so far as concerns their dealings with others.” 80 Cong. Rec. 9419 (1936) (remarks of Rep. Utterback).
In light of this circumscribed congressional intent, there can be no argument that §4 of the Robinson-Patman Act should be viewed as a broad mandate for industry self-regulation. No need exists, therefore, to narrow the Sherman Act in order to accommodate any competing congressional policy requiring discretionary self-policing. Indeed, Congress would appear to have taken some care to make clear that no constriction of the Sherman Act was intended. In any event, the absence of procedural safeguards can in no sense determine the antitrust analysis. If the challenged concerted activity of Northwest’s members would amount to a per se violation of § 1 of the Sherman Act, no amount of procedural protection would save it. If the challenged action would not amount to a violation of § 1, no lack of procedural protections would convert it into a per se violation because the antitrust laws do not themselves impose on joint ventures a requirement of process.
B
This case therefore turns not on the lack of procedural protections but on whether the decision to expel Pacific is properly viewed as a group boycott or concerted refusal to deal mandating
per se
invalidation. “Group boycotts” are often listed among the classes of economic activity that merit
per se
invalidation under § 1. See
Klor’s, Inc.
v.
Broadway-Hale Stores, Inc.,
Cases to which this Court has applied the
per se
approach have generally involved joint efforts by a firm or firms to disadvantage competitors by “either directly denying or persuading or coercing suppliers or customers to deny relationships the competitors need in the competitive struggle.” Sullivan,
supra,
at 261-262. See,
e. g., Silver, supra
(denial of necessary access to exchange members);
Radiant Burners, Inc.
v.
Peoples Gas Light & Coke Co.,
*295
Although a concerted refusal to deal need not necessarily possess all of these traits to merit
per se
treatment, not every cooperative activity involving a restraint or exclusion will share with the
per se
forbidden boycotts the likelihood of predominantly anticompetitive consequences. For example, we recognized last Term in
National Collegiate Athletic Assn.
v.
Board of Regents of University of Oklahoma
that
per se
treatment of the NCAA’s restrictions on the marketing of televised college football was inappropriate — despite the obvious restraint on output — because the “case involves an industry in which horizontal restraints on competition are essential if the product is to be available at all.”
Wholesale purchasing cooperatives such as Northwest are not a form of concerted activity characteristically likely to result in predominantly anticompetitive effects. Rather, such cooperative arrangements would seem to be “designed to increase economic efficiency and render markets more, rather than less, competitive.” Broadcast Music, Inc. v. Columbia Broadcasting System, Inc., supra, at 20. The arrangement permits the participating retailers to achieve economies of scale in both the purchase and warehousing of wholesale supplies, and also ensures ready access to a stock of goods that might otherwise be unavailable on short notice. The cost savings and order-filling guarantees enable smaller retailers to reduce prices and maintain their retail stock so as to compete more effectively with larger retailers.
Pacific, of course, does not object to the existence of the cooperative arrangement, but rather raises an antitrust challenge to Northwest’s decision to bar Pacific from continued membership.
6
It is therefore the action of expulsion that
*296
must be evaluated to determine whether
per se
treatment is appropriate. The act of expulsion from a wholesale cooperative does not necessarily imply anticompetitive animus and thereby raise a probability of anticompetitive effect. See
Broadcast Music, Inc.
v.
Columbia Broadcasting System, Inc., supra,
at 9. Wholesale purchasing cooperatives must establish and enforce reasonable rules in order to function effectively. Disclosure rules, such as the one on which Northwest relies, may well provide the cooperative with a needed means for monitoring the creditworthiness of its members.
7
Nor would the expulsion characteristically be likely to result in predominantly anticompetitive effects, at least in the type of situation this case presents. Unless the cooperative possesses market power or exclusive access to an element essential to effective competition, the conclusion that expulsion is virtually always likely to have an anticompetitive effect is not warranted. See L. Sullivan, Law of Antitrust 292-293 (1977); Brodley,
The District Court appears to have followed the correct path of analysis — recognizing that not all concerted refusals to deal should be accorded per se treatment and deciding this one should not. 9 The foregoing discussion suggests, however, that a satisfactory threshold determination whether anticompetitive effects would be likely might require a more detailed factual picture of market structure than the District *298 Court had before it. Nonetheless, in our judgment the District Court’s rejection of per se analysis in this case was correct. A plaintiff seeking application of the per se rule must present a threshold case that the challenged activity falls into a category likely to have predominantly anticompetitive effects. The mere allegation of a concerted refusal to deal does not suffice because not all concerted refusals to deal are predominantly anticompetitive. When the plaintiff challenges expulsion from a joint buying cooperative, some showing must be made that the cooperative possesses market power or unique access to a business element necessary for effective competition. Focusing on the argument that the lack of procedural safeguards required per se liability, Pacific did not allege any such facts. Because the Court of Appeals applied an erroneous per se analysis in this case, the court never evaluated the District Court’s rule-of-reason analysis rejecting Pacific’s claim. A remand is therefore appropriate for the limited purpose of permitting appellate review of that determination.
Ill
“The
per se
rule is a valid and useful tool of antitrust policy and enforcement.”
Broadcast Music, Inc.
v.
Columbia Broadcasting System, Inc.,
It is so ordered.
Notes
That section reads in relevant part:
“Every contract, combination in the form of trust or otherwise, or conspiracy, in restraint of trade or commerce among the several States, or with foreign nations, is declared to be illegal.”
Although this patronage rebate policy is a form of price discrimination, §4 of the Robinson-Patman Act specifically sanctions such activity by cooperatives:
“Nothing in this Act shall prevent a cooperative association from returning to its members, producers, or consumers the whole, or any part of, the net earnings or surplus resulting from its trading operations, in proportion to their purchases or sales from, to, or through the association.” 49 Stat. 1528, 15 U. S. C. § 13b.
A relevant state-law provision provides analogous protection. Ore. Rev. Stat. §646.030 (1983).
See L. Sullivan, Law of Antitrust 229-230 (1977); Bauer, Per Se Illegality of Concerted Refusals to Deal: A Rule Ripe for Reexamination, 79 Colum. L. Rev. 685 (1979).
Northwest raises no challenge before this Court to the conclusion of the Court of Appeals that the cooperative’s decision to expel Pacific was a “combination or conspiracy” affecting interstate commerce within the meaning of § 1 of the Sherman Act.
See,
e. g., American Motor Specialties Co.
v.
FTC,
Because Pacific has not been wholly excluded from access to Northwest’s wholesale operations, there is perhaps some question whether the challenged activity is properly characterized as a concerted refusal to deal. To be precise, Northwest’s activity is a concerted refusal to deal with Pacific on substantially equal terms. Such activity might justify per se *296 invalidation if it placed a competing firm at a severe competitive disadvantage. See generally Brodley, Joint Ventures and Antitrust Policy, 95 Harv. L. Rev. 1521, 1532 (1982) (“Even if the joint venture does deal with outside firms, it may place them at a severe competitive disadvantage by treating them less favorably than it treats the [participants in the joint venture]”).
Pacific argues, however, that this justification for expulsion was a pretext because the members of Northwest were fully aware of the change in ownership despite lack of formal notice. According to Pacific, Northwest’s motive in the expulsion was to place Pacific at a competitive disadvantage to retaliate for Pacific’s decision to engage in an independent wholesale operation. Such a motive might be more troubling. If Northwest’s action were not substantially related to the efficiency-enhancing or procompetitive purposes that otherwise justify the cooperative’s practices, an inference of anticompetitive animus might be appropriate. But such an argument is appropriately evaluated under the rule-of-reason analysis.
Given the state of this record it is difficult to understand how the Court of Appeals could have concluded that Pacific “loses the ability to use Northwest’s superior warehousing and expedited order-filling facilities, as well as any competitive advantages that may flow simply from being known in the industry as a member of an established cooperative.”
The District Court stated:
“I think that in a case of this nature, in order to move an antitrust violation, it is necessary to show some restraint of competition, and I don’t believe that is shown here. Even if it is a group boycott, I still believe under [Joseph E. Seagram & Sons, Inc. v. Hawaiian Oke & Liquors, Ltd.,416 F. 2d 71 (CA9 1969), and Ron Tonkin Gran Turismo, Inc. v. Fiat Distributors, Inc.,637 F. 2d 1376 (CA9 1981)], that the Rule of Reason operates. And I think if you apply the Rule of Reason to the facts that are submitted by the parties here that are not disputed in this case, you come to the conclusion that there is [sic] simply been no showing by the Plaintiff in this case of a restraint of competition as distinguished from possible damage to the Plaintiff by being expelled from the association.” App. to Pet. for Cert. 23-24.
