Opinion for the Court filed by Circuit Judge STARR.
Concurring opinion filed by Circuit Judge WILLIAMS.
Dissenting opinion filed by Circuit Judge MIKVA.
This case comes before us on petition for review of a decision of the Federal Trade Commission holding Boise Cascade Corporation in violation of section 2(f) of the Robinson-Patman Act, 15 U.S.C. § 13(f) (1982). The Commission determined that Boise’s receipt of price discriminations, in the form of discounts on office products it purchased for resale to consumers, tended to cause competitive injury to dealers in the office products industry with whom Boise competes. In so concluding, the Commission relied upon the “inference” of competitive injury, articulated by the Supreme Court in FTC v. Morton Salt, 334 U.S. 37, 68 S.Ct. 822, 92 L.Ed. 1196 (1948), that arises when a substantial price discrimination exists over time. For the reasons to *1129be set forth, we grant the petition for review.
I
A
Before examining the facts in this case, we first pause briefly to describe the pertinent statutory framework. Section 2(f) of the Robinson-Patman Act makes it unlawful for any person “knowingly to induce or receive a discrimination in price which is prohibited [under the Robinson-Patman Act].”1 15 U.S.C. § 13(f). Since the Act directly proscribes only a seller’s activities, the liability of a buyer under section 2(f) depends on whether the seller discriminated in the buyer’s favor in violation of section 2(a) of the Act. See, e.g., Great Atlantic & Pacific Tea Co. v. FTC, 440 U.S. 69, 76-77, 99 S.Ct. 925, 931, 59 L.Ed.2d 153 (1979); Automatic Canteen Co. v. FTC, 346 U.S. 61, 70-71, 73 S.Ct. 1017, 1022-23, 97 L.Ed. 1454 (1953). Section 2(a) prohibits price discrimination between different purchasers “where the effect of such discrimination may be substantially to lessen competition or tend to create a monopoly in any line of commerce, or to injure, destroy, or prevent competition with any person who either grants or knowingly receives the benefit of such discrimination, or with customers of either of them.”2 Id. § 13(a).
To establish a prima facie case under section 2(f), the Commission must establish two things: first, that the buyer received a lower price than its competitors, and second, that the price discrimination caused, or reasonably might cause, competitive injury.
The statute also specifies two defenses to a seller’s (and therefore to a buyer’s derivative) liability. No violation exists where the discount reflects the lower cost to the seller of selling to the favored customer (the “cost-justification” defense), nor where the seller granted the discount in good faith to meet a competing seller’s price (the “meeting competition” defense).3 Id. § 13(a)-(b); see also Automatic Canteen, 346 U.S. 61, 73 S.Ct. 1017 (interpreting “cost-justification” defense); FTC v. Sun Oil Co., 371 U.S. 505, 83 S.Ct. 358, 9 *1130L.Ed.2d 466 (1963) (interpreting “meeting competition” defense). In addition to these statutory defenses, the Commission recognizes a defense, or more precisely, finds an absence of competitive injury, where the discounts are generally and practically available to competitors of the favored customer (the “practical availability” defense). See, e.g., FLM Collision Parts, Inc. v. Ford Motor Co., 543 F.2d 1019, 1025-26 (2d Cir.1976), cert. denied, 429 U.S. 1097, 97 S.Ct. 1116, 51 L.Ed.2d 545 (1977).
B
On April 23,1980, the Commission issued a complaint, over vigorous dissent, charging that Boise, as a “dual distributor” (both wholesaler and retailer) of office products, had violated section 2(f) of the Robinson-Patman Act. The complaint alleged that Boise’s receipt of wholesale discounts from manufacturers on products that it then resold in a retail capacity to consumers constituted price discrimination for purposes of section 2(a). (No charge as to wholesale discounts for products that Boise thereafter sold in a wholesale capacity was pursued). The complaint alleged that Boise received these discounts knowingly and that the effect of Boise’s receipt of such favorable pricing (and the resulting differential in prices) “has been or may be substantially to lessen, injure, destroy, or prevent competition” with dealers that were ineligible for the wholesale discounts. See Complaint, Boise Cascade Corp., FTC No. 9133 (Apr. 23, 1980), Joint Appendix (“J.A.”) at 3-4.
In issuing the complaint, the Commission directed the Administrative Law Judge to receive evidence and to make findings of fact sufficient for disposition of the case under the competing standards of two FTC cases, namely Mueller Co., 60 F.T.C. 120 (1962), aff’d, 323 F.2d 44 (7th Cir.1963), cert. denied, 377 U.S. 923, 84 S.Ct. 1219 (1964), and an earlier FTC case that Mueller had overruled, Doubleday & Co., 52 F.T.C. 169 (1955). Doubleday, in brief, had articulated an additional defense under section 2(f) when the amount of the price disparity was reasonably related to the buyer’s cost (as distinguished from the seller’s cost savings) of providing additional marketing services. As we shall presently see in fuller detail, Mueller rejected entirely Doubleda’s rationale, but both cases nonetheless seemed to live on within FTC chambers as competing strains of Robinson-Patman thought.
II
At the outset of our examination of the office products industry, it is appropriate to sound a note of caution as the applicable law meets the rich web of facts. The voluminous record of this case eloquently attests to the fact that the manufacture and sale of office products have given rise to a complex, dynamic industry with a variety of players performing discrete but interrelated roles. Resolving the controversy at hand requires applying to this complex business environment a set of legal ground rules which are in a state of considerable uncertainty. We are therefore well advised to follow the lead of courts which, confronted with cases arising under Robinson-Patman, have found it necessary to map out in some detail the competitive terrain upon which the players do battle. See, e.g., FLM Collision Parts, 543 F.2d 1019; see also Edward J. Sweeney & Sons, Inc. v. Texaco, 637 F.2d 105 (3d Cir.1980), cert. denied 451 U.S. 911, 101 S.Ct. 1981, 68 L.Ed.2d 300 (1981). We hasten to observe that this fact-intensive approach is dictated by the statute itself, which as we indicated at the outset calls for an inquiry into whether the effect of a price discrimination has been or “may be substantially to lessen ... injure, destroy or prevent competition.” 15 U.S.C. § 13(a).
A
The office products industry involves the manufacture, distribution, and sale of stationery, office supplies and office furniture.4 AU Finding 6, J.A. at 46. A wide *1131range of items falls within the broad compass of “office products,” including, to name just a few, business forms, appointment books, portfolios, address books, file cabinets, desk stands, ring binder notebooks, work sheet pads, and paper punches. See generally id. 103-06, 157-59, 202-20, 252, 287-90, 330-40; J.A. at 66, 76, 83-85, 89-90, 95, 102-04.
The sale of office products has traditionally occurred at three levels: manufacture, wholesale, and retail.
Manufacturers. Manufacturers in this industry sell their goods to wholesalers, dealers, and, on occasion, directly to end-users. Id. 7, J.A. at 46. Although the record provides no precise numbers, compare id., J.A. at 46 with id. 65, J.A. at 59, office products are apparently produced by at least 1,000 manufacturers in the United States. Id. 7, J.A. at 46. These manufacturers produce and market a bewildering array of products. For instance, Shaeffer Eaton, a division of Textron Inc., one of the six manufacturers that the Commission selected in its effort to demonstrate that Boise had violated section 2(f), produces writing instruments, social stationery, record books, typewriter paper, and other sundry items. Transcript at 1059. These products are, of course, manufactured in a wide variety of colors and sizes, creating hundreds of separate Shaeffer Eaton items. This proliferation of products and product lines is apparently not at all unusual in the industry.
Wholesalers. Wholesalers are defined as firms or individuals that buy goods for resale to dealers. Id. 23, J.A. at 50. There are approximately 100 wholesalers in the industry. Most are small, privately-owned businesses. Id. 27, J.A. at 51; Transcript at 6587-88. Sales at the wholesale level are dominated by five nationwide companies (the largest of which is Boise). These “Big Five” firms account for about 60% of the total volume of wholesale sales. AU Findings 26, 28, J.A. at 50-51. Boise, as we shall presently see, fits within the category of “dual distributors,” that is to say an integrated wholesaler that carries on retail as well as wholesale functions.
Dealers. Dealers, by definition, purchase office products from manufacturers or wholesalers (or both) for resale to consumers. Id. 43, J.A. at 54. Within the broad genus of-dealers (also referred to as “retailers”), one finds a number of species. Take, for example, the “contract stationer,” a title generally used to denote large dealers (but sometimes employed to refer to any dealer that has on-going contracts with industrial customers). Id. 44, J.A. at 54. There is also (1) the “rack jobber,” a specialized breed that maintains the stock of one line of products on a lease-type basis with retail stores; (2) the more familiar “mass marketer,” which is a food or variety chain store, such as K-Mart or Walmart; (3) the “mail order house,” which advertises and sells to consumers through the mail; and (4) the “converter,” which buys component parts, assembles them, and markets them under the manufacturer’s or its own label. See, e.g., Transcript at 1209, 1292-95. In addition, formal and informal dealer “buying groups” — coalitions of dealers formed in order to garner advantageous discounts — exist in most areas of the country. AU Finding 455, J.A. at 129. There are approximately 8,000 dealers in the industry. Id. 47, J.A. at 55.
Dual Distributors. In addition to these three major categories of participants, there is another player on the office products field, as we alluded to above. The “dual distributor” purchases products for resale to both dealers and end-users. Id. 5, J.A. at 46. Although the record does not specify how many wholesalers engage in dual distribution, Boise contends that most do. Boise’s Brief at 5; Transcript at 5090. Of the “Big Five” wholesalers, however, only Boise (and possibly one other) is a dual distributor. Commission’s Brief at 5. Due to the understandable reluctance of dealers to buy from their competitors, dealers rarely move into the class of dual distributors. See Transcript at 3597; see also AU Findings 63, JA. at 58.
In the office products industry, price is typically expressed in the form of a “manufacturer’s suggested list price,” less a discount, if any. To illustrate by way of a simple example, suppose the manufacturer’s suggested list price for a product is $1.00. If the manufacturer offers a buyer a 50% discount, the list price is reduced by 50% and the product is thus sold to that buyer for 50 cents. If the manufacturer offers a 50-20% discount, the list price is reduced first by 50%. A 20% discount is then applied to that amount (50 cents), thus leaving 40 cents as the net price to the buyer. Id. 8, J.A. at 46.
Manufacturers’ discounts take many forms.5 Perhaps best-known are quantity and volume discounts. To state the obvious, quantity discounts are lower per unit prices charged for large orders of a product or group of products, as opposed to smaller orders. Id. 9-10, J.A. at 47. Volume discounts, on the other hand, are tied to the aggregate annual amount purchased from the manufacturer by a particular buyer. Id. 10, J.A. at 47. In addition, promotional discounts, which range from additional year-end discounts to extension of payment deadlines, are prevalent in the industry. Id. 20-22, J.A. at 49-50.
To a more limited extent, manufacturers also offer bid discounts. These may arise when large end-users — typically government entities — that need substantial quantities of office products solicit bids from marketing intermediaries (wholesalers and retailers) and seek prices different from those normally offered to end-users. Id. 15-19, J.A. at 49. Manufacturers offer the same “bid” discounts to all distributors submitting bids to these end-users, regardless of their identity as wholesalers or dealers.
Most significant for purposes of this case, however, are functional and trade discounts. A trade discount is one given to purchasers on the basis of the level of trade at which they operate. The discount depends solely on to whom the purchaser resells; it is entirely independent of marketing functions performed by the purchaser. Id. 517, J.A. at 141. A functional discount, in contrast, is offered by a manufacturer to a purchaser for assuming and performing a function that would otherwise be performed by the manufacturer. Id. 518, J.A. at 141. The pure functional discount operates independently of the purchaser’s level of trade. In other words, any purchaser that performs the required functions would be eligible for the discount regardless of whether it is nominally a wholesaler or retailer.
At issue in this case is the validity of a hybrid discount which partakes of both a trade and functional discount. This discount, which for purposes of clarity and consistency we will call a “wholesale discount,” has existed, without change, for many years in the office products industry. Indeed, the wholesale discount has been extended by most manufacturers of office supplies since well before Boise entered the industry.6 Id. 489, J.A. at 136. Its purpose is to induce wholesalers to undertake distribution and marketing functions on behalf of manufacturers. Id. 447, 460, J.A. at 127, 130. Manufacturers therefore extend the discount to any company, regardless of size, that meets the objective criteria contained in their respective definitions of “wholesaler.”
In defining “wholesaler,” all manufacturers in this industry require that the candidate resell products to dealers. Significantly, however, manufacturers do not require that the candidate resell exclusively to dealers (or other non-end-users). Nor do *1133manufacturers limit the availability of the discount to those goods that are resold to dealers. Instead, manufacturers typically consider membership in the Wholesale Stationers Association (which, as its name suggests, is a trade association for wholesalers of office products) determinative of eligibility to receive the wholesale discount. Transcript at 1219, 1280-82, 1691-92, 2334. Under the Association’s guidelines, any company that resells at least 20% of its office products to dealers qualifies as a wholesaler. Commission’s Exhibit 2002D. As a result of this generous definition, most “dual distributors” clear the first definitional hurdle for wholesale discount eligibility, whereas those dealers which sell exclusively to end-users naturally do not. AU Findings 449, 454, J.A. at 128, 129.
Beyond the universal requirement that a buyer resell (at least 20%) to dealers, manufacturers differ in their respective criteria for granting wholesale discounts. To illustrate with the Commission’s six selected manufacturers in this case, both Rediform Office Products, a division of Moore Business Forms, Inc., and Sheaffer Eaton define a wholesaler as a purchaser which not only sells to dealers but also warehouses and promotes their products, publishes a catalog, and employs and trains salespeople who call on dealers. Id. at 447, 450, J.A. at 127, 128. Kardex Systems, Inc. defines a wholesaler as a purchaser which maintains inventory on a variety of product lines for resale to dealers, publishes a price list, may (but apparently does not have to) publish a catalog, and employs outside salespeople. Id. 449, J.A. at 128. In contrast, the sole criterion imposed by both Boorum & Pease Company and Master Products Manufacturing Co. is that the purchaser resell to dealers and contract stationers. Id. at 451, 453, J.A. at 128,129. Finally, Bates Manufacturing Company requires that the purchaser resell to dealers, carry an inventory of Bates’ products, and publish a catalog. Id. 452, J.A. at 128-29.
Thus, wholesale discounts are trade discounts insofar as they are awarded on the basis of the identity of those to whom the marketing intermediary resells. To the extent that these manufacturers require the recipient to perform functions (such as publication of a catalog and warehousing) in order to qualify for the discount, the wholesale discount partakes of a functional discount. See generally Transcript at 6838-71.
Ill
With this overview of the office products industry and its pricing structure in mind, we turn to the specifics of the case before us.
A
Boise is an integrated forest products company. It entered the office products industry in 1964 as a dual distributor through the acquisition of Associated Stationers Company. AU Finding 3, J.A. at 45. From this beginning, Boise’s Office Products Division quickly grew, to the point where today its combined wholesale and retail sales make it the largest distributor of office products in the United States. Id. 5, 52, J.A. at 46, 56. From 1976 to 1980, Boise’s sales in its wholesale capacity amounted to slightly over half its total sales. Id. 54-58, J.A. at 56-57. Excluding the Division’s retail sales, Boise is one of the two largest wholesalers in the United States. Id 53, J.A. at 56. Notwithstanding its considerable size, Boise’s purchases typically account for less than 5% of any single manufacturer’s total sales. See Transcript at 6087.
Headquartered in Itasca, Illinois, Boise’s Office Products Division operates through distribution centers located in 27 cities. AU Finding 2, J.A. at 45. Each distribution center is responsible for marketing, inventory management, purchasing, warehousing, sales, and customer service. Id. 4, J.A. at 46. Accordingly, the purchasing department at each of the 27 locations places its orders directly with manufacturers, which in turn ship the goods directly to and bill the individual distribution center. Id. 67, 463, J.A. at 59, 131. Likewise, each distribution center employs its own sales force to call on Boise’s dealer and commer*1134cial (end-user) accounts.7 Id. 76, J.A. at 60a.
Although in its capacity as a dealer Boise performs essentially the same marketing functions for manufacturers as do other dealers, Boise is, by virtue of being a dual distributor, able to obtain wholesale discounts unavailable to the 23 dealers selected by the Commission for review in this case. Id. 95, J.A. at 64. These discounts are received on goods of like grade and quality that Boise sells in competition with those dealers. Id. 95-100, J.A. at 64-66. As we previously indicated, see supra text at 8-9, all six manufacturers studied in this case extend to companies (including Boise) that qualify as wholesalers, wholesale discounts that represent reductions in list prices beyond those offered to dealers.8 As a result of the difference between dealer and wholesaler discounts, the 23 selected dealers pay between 5% and 33% more for their purchases from manufacturers than does Boise.9
At the same time, Boise played no role in the adoption or formulation of the manufacturers’ standards for offering wholesale discounts. Transcript at 1660-61, 2004, 2345. And, although the Commission points to evidence of Boise’s successful negotiation for the discounts, Commission’s Brief at 20 n. 19, the Commission candidly *1135admits that the AU did not find that Boise had in any way coerced or pressured the manufacturers into extending it the wholesale discounts. Id. at 16-17.
B
The office products industry is characterized by intense competition. Id. 408, J.A. at 117. The industry, moreover, has flourished during the period in question. From 1976 to 1982, there was a steady rise in the number of dealers in the industry, both nationwide and in the individual States where the FTC’s selected dealers are located. Id. 47, J.A. at 55. Boise’s economic expert, Dr. Kenneth Elzinga, see supra note 6, interpreted this upward trend as indicating an absence of anti-competitive forces operating in the market. Transcript at 6103-14.
More relevantly for Robinson-Patman purposes, an analysis of the financial condition of 18 of the selected dealers revealed that all 18 had enjoyed an increase in sales during the period in question. Phoenix-based Wist Supply & Equipment Co., for instance, increased total sales from $1.6 million in 1977 to $4 million in 1980. Boise’s Exhibits 300, 804. Yorkship Business Supply of Cherry Hill, New Jersey similarly increased sales from $1.3 million in 1977 to $3.5 million in 1980. Id. Pomer-antz & Company in Philadelphia increased sales from $14.6 million in 1977 to $36.3 million in 1980. Id. Overall, the average annual growth and increase in gross profits of the dealers from 1977 to 1980 was in excess of 22%. Id. 431, J.A. at 121-22. What is more, this substantial growth occurred during a period of recession in the economy. AU Finding 431-32, J.A. at 121-23.
Along with their growth, the selected dealers’ credit ratings with Dun & Bradstreet were, on the whole, quite favorable. Id. 432, J.A. at 122-23. And those companies that experienced a change in credit rating from 1977 to 1980 generally improved, again in the teeth of a recessionary economy. Id., J.A. at 122-23.
Data compiled by the National Office Products Association, the major industry trade association, revealed that in each year from 1967 to 1980, dealers’ median net profit before taxes as a percent of sales ranged from 3.0% to 3.9% (except in 1974, when the median net profit was a heftier 4.3%). Id. 423-29, J.A. at 120-21. According to Mr. Ronald Rowe, the Commission’s accounting expert, the median net profit for the selected dealers ranged from 2.3% to 3.5% for the years 1976 to 1981. Id. 430, J.A. at 121. From 1976 to 1979, Boise’s combined wholesale and retail median net profit before taxes as a percent of sales ranged from 3.1% to 5.6%. Id. 87, J.A. at 62. This return on sales, as Boise’s 1979-83 Business Plan explained, was comparable to the leading industrial stationers in the industry. Id., J.A. at 62.
C
In addition to this undisputed evidence of competitive health of the selected dealers and in the industry as a whole, there is another aspect of this case that is relevant to resolution of this controversy and unusual in the context of a Robinson-Patman proceeding — a virtually complete absence of sales lost to Boise by the selected dealers traceable to the price differential caused by wholesale discounts to Boise. Although the Commission aggregated 23 dealers, each of which carries hundreds, and in some cases thousands, of accounts, the record shows only 162 specific accounts identified by the dealers as lost to Boise. Commission’s Brief at 33. This stability of dealer accounts is of especial note in an industry where switching of accounts is common. Id. 422, J.A. at 120. Significantly, none of the selected dealers that lost accounts in whole or in part to Boise was able to conclude that the losses were due to the fact that Boise received a greater discount from the six manufacturers. Id. 407, J.A. at 117.
To be more specific, the Commission’s selected dealers testified that they lost accounts to Boise, in whole or in part, due to Boise’s lower prices, better service, or a combination of these factors. Id. 384, J.A. at 112-13. For example, Victoria Station, a restaurant chain headquartered near San *1136Francisco, switched from one dealer, Gilbert — Clarke, to Boise because of the latter’s pricing and services. Id. 390, J.A. at 114. The City of Seattle switched the majority of its business from the incumbent dealer to Boise because of Boise’s sophisticated invoicing system, depth of inventory, high fill rates, and usage reports. Id. 393, J.A. at 114. G.E. Stimpson, another dealer, lost the account of one valued customer to Boise’s lower prices. Id. 396, J.A. at 115. New England Telephone switched from Union Office Supply to Boise because the latter had a computerized backup system that Union did not possess at the time.. Id. 398, J.A. at 115. See also id. 385-406, J.A. at 113-17.
In addition to the small number of lost accounts, the record shows many instances where accounts shifted not because of price or service, but because sales representatives shifted. See, e.g., Transcript at 3855-56, 3276-78, 2498-99, 2527, 2544-45, 2953, 2041, 2071, 3467, 2444-45, 3170-74, 3188, 3402-03. The AU quoted Dr. Elzinga’s testimony in this respect:
If you were trying to develop a theory of account shifting in the office products industry, probably the most robust theory you could develop is that accounts shift when salespeople shift. Over and again, as I am reading testimony about account shifting, I find that the real reason the account shifted is because a .salesperson left. That is, Boise hires a salesperson away from Yorkship, and they get some accounts from Yorkship. Although in that case, if you read on, you find later Yorkship gained some of those back.
.... It is so common in this industry I think they have a term for it. It is called following; the salespeople have a following. The thing that struck me is the amount of evidence that seemed unambiguous of an account shifting that was explicable not by lower prices, not by better service, but by the simple pristine fact that the salesperson shifted.
AU Finding 434, J.A. at 123a-124 (quoting Transcript at 6118-19) (footnote omitted).
Further diluting the Commission’s attempted showing of diverted sales, Boise introduced considerable evidence of sales that it had lost to the selected dealers. The AU, moreover, made specific findings to this effect. For instance, Boise’s Philadelphia distribution center lost four large accounts in 1982 to dealers that offered lower prices. Id. 418, J.A. at 119. Likewise, Boise’s Boston distribution center lost several accounts to Monroe, one of the selected dealers, because Monroe offered significantly lower prices. Id. 420, J.A. at 120. Seven accounts switched from Boise’s Phoenix distribution center to Wist due to Wist’s lower prices. Id. 421, J.A. at 120.
In addition to evidence of accounts actually lost, Boise identified many instances where lower prices were offered by the selected dealers and their competitors. Id. 409, J.A. at 117. One of Boise’s Washington, D.C. salespersons, for example, testified that a dealer’s price list obtained from one of Boise’s customers revealed that the dealer was offering prices on average 30% lower than those offered by Boise. Id. 412, J.A. at 118. In the same vein, a sales representative from Boise’s Salt Lake City distribution center testified that although he had submitted pricing to two school districts which was only 4% to 5% over Boise’s costs, Boise received only 10% to 20% of the districts’ business. Id. 414, J.A. at 119. See also id. 410-21, J.A. at 118-20.
The AU quoted Boise’s expert’s analysis and conclusions in this regard:
The evidence that I have studied and reflected on with regard to lost accounts persuades me that you simply cannot look at that evidence and conclude that injury to competition has occurred or is occurring here.
In fact the thing that really strikes me — and here again I speak as an economist — is you look at these [selected] dealers who ... have literally hundreds and hundreds and in some cases thousands of accounts, and when they are asked to give illustrations and to document the accounts they have lost to Boise, they are able to come up with a handful at *1137best. I was really struck at the tiny number, in fact.
In fact, it was in a way even troubling to me as an economist that there were not more accounts being diverted around just through normal market processes. I would have expected much more just through almost random competitive shocks.
... [T]he striking thing to me is how few accounts were lost, and then when you start to get into the record as to the precise facts about those purportedly lost accounts, I find over and again that it is not clear to me they were lost to Boise, much less were they lost to Boise because Boise buys products at lower prices from manufacturers.
Id. 433, J.A. at 123-23a (quoting Transcript at 6119-22).
IV
Notwithstanding his findings (1) that the selected dealers were competitively healthy and (2) that “accounts lost to Boise were counter-balanced by accounts which Boise lost to the dealers,” the AU concluded that that evidence went only to the price discrimination’s lack of effect on market structure. J.A. at 153-54. By virtue of that characterization, the AU determined that market-structure evidence was by its nature inadequate to rebut the inference of competitive injury raised by the sustained and substantial price discrimination that Boise received. J.A. at 154-55; see FTC v. Morton Salt Co., 334 U.S. at 46-47, 68 S.Ct. at 828-29. The AU stated his position in the following way: “[I]t is inconceivable that the substantial and sustained price differences documented in this record can have had no substantial effect on the ability of the dealers to compete with Boise.” J.A. at 155.
Having determined that a prima facie violation of section 2(f) existed, the AU went on to conclude that the discounts were not practically available to the selected dealers, J.A. at 155-57, and that Boise knew, or should have known, that the dis-criminations in price were neither cost-justified nor given in good faith to meet competition, J.A. at 161-70. In addition, the AU recommended that the Commission adhere to its decision in Mueller. J.A. at 159-61. On the possibility that the Commission would reembrace the Doubleday rule, the AU determined that, because Boise did not perform services not performed by the selected dealers, Boise did not qualify for that "defense.” J.A. at 161.
The Commission heard oral argument on the case in June 1984, and in February 1986 issued its order and opinion adopting and affirming the AU’s findings of fact and conclusions of law. Boise Cascade Corp., FTC No. 9133 (Feb. 11, 1986), J.A. at 174 [hereinafter Commission Decision]. In its opinion, the Commission expressly relied on Morton Salt’s inference that substantial price discrimination between competing purchasers over time causes, or tends to cause, competitive injury. Id. at 187. In doing so, the Commission expressly recognized that the inference “ ‘may be overcome by evidence breaking the causal connection between a price differential and lost sales or profits.’ ” Id. (quoting Falls City Industries, Inc. v. Vanco Beverage, Inc., 460 U.S. 428, 435, 103 S.Ct. 1282, 1289, 75 L.Ed.2d 174 (1983)). Specifically, the Commission suggested that the Morton Salt inference could be overcome by a showing that market conditions unrelated to the price discrimination explained the lost accounts or shifted sales or the effects on the disfavored competitors (presumably lost profits or market share). Commission Decision, J.A. at 191.
The Commission nonetheless determined that Boise’s showing of dealer-specific and industry-wide competitive health, in conjunction with the relative absence of lost sales, “fails to rebut the ‘self-evident’ inference of causation.” Id. at 191-92. Indeed, with virtually no elaboration, the Commission concluded that Boise’s elaborate evi-dentiary showing did “not address the causal connection at all.” Id. at 191. The FTC emphasized that under Robinson-Pat-man actual injury to competition need not be shown, but only “ ‘a reasonable possibility that a price difference may harm competition.’ ” Id. at 192 (quoting Falls City, 460 U.S. at 434-35, 103 S.Ct. at 1288).
*1138Having found the two essential elements to a prima fade case (price discrimination and resulting competitive injury), the Commission concluded that Boise did not satisfy any of the defenses, statutory or Commission-fashioned, to Robinson-Patman liability. Id. at 204-18. In addition, for reasons that we will detail shortly, the Commission decided that Doubleday should not be revitalized and, accordingly, reaffirmed the mtí-Doubleday holding of Mueller. Id. at 193-204.10
y
The Commission’s decision confronts us with a difficult issue arising under a statute that does not represent the highwater mark of skillful draftsmanship. As Justice Frankfurter well put it in speaking for the Court a generation ago in Automatic Canteen Co. v. FTC, 346 U.S. at 65, 73 S.Ct. at 1020, “precision of expression is not an outstanding characteristic of the Robinson-Patman Act.” More recently, Justice Powell, joined by Justices Brennan, Marshall and Blackmun, decried judicial interpretations and applications that “increase[] the uncertainty inherent in the generalities of the Robinson-Patman Act.” J. Truett Payne Co. v. Chrysler Motors Corp., 451 U.S. 557, 570, 101 S.Ct. 1923, 1931, 68 L.Ed.2d 442 (1981) (dissenting opinion).
The need for clarity, obviously a desideratum for any body of law, has been evidenced by judicial recognition that Robinson-Patman is not to be viewed as an act of Congressional schizophrenia, an anti-competitive island situated in an otherwise turbulent sea of pro-competitive efficiency and maximization of consumer welfare, the hallmarks of the Nation’s antitrust laws. The Supreme Court warned early on of the dangers of doctrinaire interpretations of Robinson-Patman that could lead to “conflict with the purposes of other antitrust legislation.” Automatic Canteen, 346 U.S. at 63, 73 S.Ct. at 1019. That warning has been repeated in more recent times. See also United States v. United States Gypsum Co., 438 U.S. 422, 450-51, 98 S.Ct. 2864, 2880-81, 57 L.Ed.2d 854 (1978); Great A & P Tea Co., 440 U.S. at 80, 99 S.Ct. at 933.
The imprecision infecting the statutory language has frequently led courts construing the measure to repair to the backdrop against which the Robinson-Patman amendments were crafted in 1937. For it is in its genesis that the purposes animating Congress in passing this ambiguous statute can best be discerned and then borne carefully in mind in contemporary judicial applications.
The Supreme Court has summarized the statute’s background in the following way:
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 the existence of small independent retailers.
Great A & P Tea Co., 440 U.S. at 75-76, 99 S.Ct. at 930-31. Robinson-Patman was thus aimed at protecting small retail businesses against favoritism toward their larger competitors, a threat seen as eventuating from an exception carved out by the original Clayton Act, passed in 1914, permitting discriminations in price based on “differences in the grade, quality or quantity of the commodity sold.” Clayton Act, ch. 323, § 2, 38 Stat. 730 (1914), 15 U.S.C. § 13 (1982) (emphasis added). Robinson-Patman, in short, sought to remove the competitive advantage conferred solely by virtue of the size of the buyer’s appetite. “The legislative history of the Robinson-Patman Act makes it abundantly clear that Congress considered it to be an evil that a large buyer could secure a competitive advantage over a small buyer solely because *1139of the large buyer’s quantity purchasing ability.” Morton Salt, 334 U.S. at 43, 68 S.Ct. at 826. See also Falls City, 460 U.S. at 436, 103 S.Ct. at 1289; F. Rowe, Price Discrimination Under the Robinson-Patman Act 3-23 (1962) [hereinafter “Rowe”].11
The Supreme Court addressed early on the operation of Robinson-Patman in the paradigm setting envisioned by Congress —a quantity discount to large buyers. In Morton Salt, the Court was confronted with a salt manufacturer’s discount pricing system under which only the five largest retail grocery chains.in the country were able to buy enough salt to qualify for the manufacturer’s most lucrative discount. The Court found that competitive injury, a prerequisite to liability under section 2(a) of Robinson-Patman,12 was “self-evident” simply by virtue of the longstanding and substantial price disparity:
Here the Commission found what would appear to be obvious, that the competitive opportunities of certain merchants were injured when they had to pay [Morton Salt] substantially more for their goods than their competitors had to pay.
Morton Salt, 334 U.S. at 46-47, 68 S.Ct. at 828.13
In recent years, the Supreme Court has reaffirmed the viability of the Morton Salt inference of competitive injury arising from a substantial price difference existing, over time. It has, moreover, declined to cabin the Morton Salt inference to “cases involving ‘large buyer preference or seller predation.’ ” Falls City, 460 U.S. at 436, 103 S.Ct. at 1289. See also J. Truett Payne Co., 451 U.S. at 561, 101 S.Ct. at 1926. To the contrary, the Falls City Court upheld application of Morton Salt’s rule to a discriminatory pricing system based upon the geographical location of the buyer. (In that case, Indiana distributors of Falls City beer were charged higher prices than Kentucky beer distributors.)
The Morton Salt inference is thus alive and well in the law. The case before us, however, presents the Commission’s modern-day invocation of that inference in the setting of a pricing system which is entirely different from quantity and regional discounts.14 For as we have seen, the Morton Salt inference has been applied in the case at hand to a system of wholesale discounts. (The Commission uses the term “functional discount” generically to describe the wholesale discounts at issue here. We will therefore proceed to use these terms interchangeably. Cf. supra text at 1132.) Acting Chairman Calvani, in writing for the Commission, succinctly described the legislative landscape as to wholesale functional discounts: “The Act does not expressly address functional discounts, and the legislative history is inconclusive.” J.A. at 194. Thus, the imprecise statutory language of which the Supreme Court has complained, *1140 see supra text at 1138, beclouds the area of functional discounts as well.
The rather chaotic state of the law as to functional discounts was aptly summarized by then-Professor Calvani who, as fate would have it, was destined in another capacity to author the decision now before us:
[T]he uncertain status of functional discounting is primarily due to the failure of Congress, the Federal Trade Commission, and the courts to give explicit and independent recognition to the practice and to define with any modicum of specificity its permissible contours. The result of this failure of recognition has been a lack of focus upon the validity of the functional discount which, in turn, has left the law in a state of confusion, causing often legitimate practices to be condemned.
Calvani, Functional Discounts Under the Robinson-Patman Act, 17 Boston C. Indus. & Com.L.Rev. 543, 543-44 (1976).
Eloquent attestation as to the unsettled nature of the law of functional discounts is found in events surrounding the complaint that brought this case to life. In considering whether to issue a complaint, the Commission divided three to two in favor of sending the staff forward, with Commissioner Clanton and now-Dean Pitofsky in dissent. Dean Pitofsky set forth his views in a thorough opinion, which opened with the following warning:
The Commission today has issued an extremely unwise Robinson-Patman complaint. I would not ordinarily dissent from the issuance of a complaint (and certainly not at such length), but this one has such a profound anticompetitive potential that it ought not to go by without comment.
Complaint, Boise Cascade Corp. (dissenting statement of Comm’r Pitofsky), J.A. at 12.
Further evidencing the divided state of the Trade Commission’s house was its order directing the administrative law judge to receive evidence and enter findings sufficient to dispose of the case under two warring doctrines articulated in the corpus of FTC law. As we saw above, see supra text at 1130, the earlier doctrine was the Doubleday rule, first clearly enunciated in Doubleday & Co., 52 F.T.C. 169, involving a publishing company’s disparately favorable discounts bestowed upon three large jobber-distributors. To remind the patient reader, the Doubleday rule briefly stated is as follows: no injury to competition is occasioned by a buyer’s receipt of a discount from a seller-supplier if that discount simply compensates the buyer for additional useful services it performs for the seller-supplier’s benefit.
Doubleday recognized that the world of commerce, like the rest of life, is not simple. As complex distribution systems developed, the lines along the distribution chain became blurred. No longer was there a straightforward, three-tiered structure of manufacturer-wholesaler-retailer. In Doubleday, then-Chairman Howrey commented on this development as follows:
[M]ore complex types of distributors ... were beginning to dominate our market structure — distributors whose functions ranged from only partial performance of the wholesale function to those who were almost wholly integrated, that is, who were both wholesalers and retailers and often consumers as well.
Under these conditions classification of buyers became unprecise and shifting in meaning. Wholesalers and retailers no longer comprised clear-cut separate links between the producer and the ultimate consumer, each responsible for a clearly defined set of duties. Marketing functions became scrambled, with many permutations and combinations.... The number of patterns was legion and diverse.
Id. at 208. This presumably beneficial dynamism in the marketplace was threatened by what Chairman Howrey viewed as “a suspended state of confusion” in the law, which did not recognize that distributive activities traditionally carried out by sellers could often efficiently be shifted to buyers, in return for which the buyers could legitimately secure compensating discounts from the sellers. Id. And thus to bring clarity into this chaotic state of affairs, *1141Chairman Howrey posited the following principle:
In our view, to relate functional discounts solely to the purchaser’s method of resale without recognition of his buying function thwarts competition and efficiency in marketing, and inevitably leads to higher prices.... Where a businessman performs various wholesale functions, such as providing storage, traveling salesmen and distribution of catalogues, the law should not forbid his supplier from compensating him for such services.
Id. at 209. Chairman Howrey condemned as arbitrary an exclusionary rule that would forbid an integrated wholesaler from proving that it was indeed performing the wholesaling function. The matter, rather, should “be put to proof.” Id. The evidentiary burden on the integrated wholesaler was not, the Chairman warned, to be insubstantial:
[T]he Commission should tolerate no subterfuge. Only to the extent that a buyer actually performs certain functions, assuming all the risks and costs involved, should he qualify for a compensating discount. The amount of the discount ... should not exceed the cost of that part of the function he actually performs on that part of the goods for which he performs it.
Id.
But as befits an imprecise statute which reflects, in Dean Pitofsky’s words, a “tension between the philosophies of the Sherman Act and the Robinson-Patman Act — a conflict created by Congress and left unresolved on the FTC’s doorstep many years ago,” Complaint, Boise Cascade Corp., (dissenting statement of Comm’r Pitofsky), J.A. at 12, Chairman Howrey’s suggested approach did not find fertile soil even within the offices of his fellow Commissioners. Foreshadowing what was destined to be the second competing approach, the Mueller rule, Commissioner Secrest in writing separately in Doubleday took issue with the Chairman’s thinking. Commissioner Secrest advocated the approach adopted by the hearing examiner, who refused to consider evidence by three large book jobbers that the discount extended to them was offset by the costs of assuming wholesale functions which Doubleday would otherwise have to perform. In Commissioner Secrest’s view, a discount is improper to the extent it compensates a buyer for services which, albeit helpful to the seller, also redound to the buyer’s own benefit. Neither altruism nor servility were at work in the marketplace; the integrated buyer was out for its own welfare, even if its activities did in fact further the seller’s commercial purposes. Calling for simplicity in enforcement, Commissioner Secrest laid down a warning if Chairman Howrey’s approach were embraced:
Enforcement of the law would be extremely difficult if not impossible, if, in each 2(a) case, the Commission were required to divide a common service which may benefit both the buyer and the seller. Each case would require an operation as delicate and difficult as the separation of Siamese twins.
52 F.T.C. at 211 (Comm’r Secrest, concurring in result).
This contrary (soon to be called Mueller) principle was thus informed by both instrumentalist and conceptual concerns: the Doubleday rule would be an immense headache to administer, and the rule would justify a discount where the buyer, by providing such services, was improving its own competitive position with other buyers. And this latter reality raised the spectre of Robinson-Patman’s core concern for little fish competing with whales (or at least larger fish). Doubleday’s rule, in short, “would undoubtedly give the larger buyer a price advantage in the resale of the seller’s goods.” Id. This same concern was echoed by Commissioner Mead, who likewise took issue with Chairman Howrey’s approach:
Whether or not [the Chairman’s view] is good economics, I am not prepared to say_ [But] it is not the law as expressed in the Robinson-Patman Act-[It] paves the way for the ultimate annihilation of small retail dealers who are unable, by reason of their inability to perform the same marketing functions as *1142their larger dual-functioning competitors to successfully compete with them.
Id. at 211-12 (Comm’r Mead, concurring in result).
The cacophony occasioned by Doubleday was short-lived. For in Mueller Co., 60 F.T.C. 120, the Commission squarely and unanimously rejected Doubleday’s treatment of functional discounts. The Doubleday approach, in the Commission’s later view, “ignores the fact that the favored buyer can derive substantial benefit to his own business in performing the distributional function paid for by the seller.” Id. at 127. In the course of its decision, the Commission overturned the hearing examiner’s finding that there was a failure of proof as to competitive injury. The Commission went on to hold in broad terms that a Robinson-Patman Act violation would lie even if the challenged discount (1) had been carefully limited to specific goods that Mueller’s favored (“limit”) jobbers had actually warehoused and (2) at most merely covered the jobbers’ increased costs incurred by virtue of the warehousing services performed on those specified goods:
These findings mean only that [Mueller] has subsidized in whole or in part the “limit” jobbers’ warehousing of certain products.... By doing so, [Mueller] has given this class of customers a substantial competitive advantage in the resale of such products. In this connection, the items on which the higher discount is given are ... the smaller, most commonly used products — those which are needed most frequently by the ultimate user, often to meet an emergency. That a jobber who has products of this type on hand is in a more favorable position than the jobber who does not is so obvious as to require little comment.
Id. at 128-29.
The Commission did not stop at this conceptually pure juncture, however. It went on to explore at some length the darker side of Mueller's purportedly benign regime of functional discounts. In contrast to Robinson-Patman’s aim at securing a “level playing field” for all players, large and small, Mueller had in fact been bestowing the extra discounts on large jobbers with which it had long-standing relationships.
As so frequently happens in antitrust litigation, a documentary “smoking gun” found its way into evidence in Mueller indicating that the discount pricing system was not founded solely on a cold, economically rational decision to reimburse the favored jobbers for distributive functions performed by them. The tell-tale document in that case was a “get lost” letter from Mueller to one of its second-class (“regular”) jobbers who sought to move into the more desirable ranks of Mueller’s first-class (“limit”) jobbers. The regular jobber had had the effrontery to request the higher discount because the ambitious jobber was planning “to stock several items which [the jobber maintained] should qualify [it] as a stocking distributor [or “limit” jobber].” Id. at 129. Mueller would have none of it.
We cannot see our way clear to change your 15% discount, for we do not have a 20% discount. We do have a greater one, however it applies only to those large stocking jobbers who place hundreds of orders with us throughout the year, totaling thousands of dollars.
Id. To leave no lingering doubts in the mind of the aspiring second-class jobber, the powers-that-be at Mueller administered the follow coup de grace:
These old established jobbers, who have been carrying MUELLER goods in large quantities for a number of years, are entitled to this protection, and until there might be some major change in your State and surrounding states, it will be necessary to continue the same differential that we have been allowing you.
Id. at 130.
Thus, upon analysis, Mueller’s two-tiered structure of jobbers smacked of the regime of favoritism that had been condemned by the Supreme Court in Morton Salt. After all was said and done, Mueller was playing favorites based upon such factors as the volume of jobber purchases and whether the jobber was a member of the exclusive club, as it were, of “old established job*1143bers.” Mueller’s distribution system had succumbed to calcification.
Examination of this darker side of Mueller appears to bring the case closer to the ultimate holding in Doubleday. For while in the latter case the publishing company had won the battle over the principle of law, the victory proved empty as Doubleday lost the war. The Commission concluded that Doubleday, like Mueller and Morton Salt, was just another in a long line of manufacturers who play favorites among distributors with anticompetitive consequences of the sort that Congress intended in Robinson-Patman to condemn. Doubleday had, upon analysis, stacked the distribution deck in favor of a very limited class, “the so-called ‘Big Three’ jobbers,” 52 F.T. C. at 206, who simply “treated the higher discounts as price reductions and not payments or allowances for services rendered.” Id. at 209.
So it is that Mueller and Doubleday, the two warring rules spawned almost a generation ago by the Commission, shared a salient characteristic with Morton Salt and, years later, Falls City. In each instance, a manufacturer or supplier’s idiosyncratic, non-economically justified pricing regime favored certain identified distributors (big distributors in Morton Salt, Doubleday and Mueller; home-State, or more precisely, non-Indiana distributors in Falls City), with nothing but favoritism — the evil sought to be remedied through the Robinson-Patman Act — to explain the disparate treatment.
VI
This case loomed at the Commission as the test of whether Mueller or Doubleday would survive in the present generation. The AU, whose thoroughness and care in this proceeding we would be remiss not to acknowledge, was thus presented with the unenviable task of trying two cases — one under Doubleday’s teaching and the other under the starkly different approach enunciated by Mueller, The unorthodoxy of this two-pronged directive from Commission headquarters did not escape the Commissioners’ notice. “The majority of the Commission today issues a complaint proceeding on two mutually exclusive, inconsistent theories of violation of the Robinson-Patman Act,” was the apt description penned by Commissioner Clanton in dissent. Complaint, Boise Cascade Corp. (dissenting statement of Comm’r Clanton), J.A. at 11; see also id. (dissenting statement of Comm’r Pitofsky), J.A. at 21-22.
At day’s end, as we have seen, the Commission (affirming the AU) embraced Mueller. And thus the case is now heralded as a battle of the Robinson-Patman titans, of Mueller versus Doubleday, with eminent authority summoned to support each of the two competing approaches. But we see a preliminary difficulty that precludes our declaring in this case whether the champions of Mueller or those of Doubleday should be the ultimate winners in the long-lived struggle over the application of Robinson-Patman to dual distributors in modern-day distribution systems. And that has to do with the threshold question whether in this case competitive injury, even as expansively defined under Robinson-Patman, see supra note 12, has been shown. Competitive injury, which no one disputes is the condition precedent for establishing violations of the Act, is a critical element. For, as we have seen, Robinson-Patman is directed to the preservation of competition. Indeed, the terms of the statute itself mandate that, in order for a price differential to be unlawful, it must tend “to injure, destroy, or prevent competition. ” 15 U.S.C. § 13(a). Cf. also Foremost Pro Color, Inc. v. Kodak Co., 703 F.2d 534, 548 (9th Cir.1983), cert. denied 465 U.S. 1038, 104 S.Ct. 1315, 79 L.Ed.2d 712 (1984); Whitaker Cable Corp. v. FTC, 239 F.2d 253, 256 (7th Cir.1956), cert. denied 353 U.S. 938, 77 S.Ct. 813, 1 L.Ed.2d 761 (1957). Injury to competition is thus the name of the Robinson-Patman game.
In its opinion, the FTC waved aside substantial evidence (1) that competition among dealers generally was healthy, (2) that the selected dealers singled out for FTC examination were thriving, and (3) that this happy picture of prosperity was apparently unclouded by instances of di*1144verted sales attributable to the challenged discounts. The Commission flatly concluded that this entire body of evidence was irrelevant. Indeed, in the Commission’s view, for reasons that we fail to discern and the FTC failed to articulate, this evidence did “not address the causal connection [between the price differentials and competitive injury] at all.” Commission Decision, J.A. at 191. This cannot be. In our view, the Commission’s conclusion that Boise’s dealer-specific evidence was irrelevant to the inference of competitive injury is wrong as a matter of law.
It is clear that Morton Salt’s inference of competitive injury “may be overcome by evidence breaking the causal connection between a price differential and lost sales or profits,” Falls City, 460 U.S. at 435, 103 S.Ct. at 1289. In reason, the inference can also be overcome by evidence showing an absence of competitive injury within the meaning of RobinsonPatman. That is to say, a sustained and substantial price discrimination raises an inference, but it manifestly does not create an irrebuttable presumption of competitive injury. Specific, substantial evidence of absence of competitive injury, see supra note 12, is, in our view, sufficient to rebut what is, after all, only an inference. The Commission, in effect, employed the Morton Salt inference to presume competitive injury conclusively in this case, and would only treat as relevant evidence “breaking the causal connection” between that assumed injury and the price discrimination to rebut the inference. This approach defies both logic and the import of Morton Salt that the inference of injury is rebut-table; for if the respondent’s evidence demonstrates that there is no competitive injury (or reasonable possibility of competitive injury) to begin with, then evidence breaking the causal connection is obviously impossible to adduce. There is, under those circumstances, no causal connection to break.
As a result of its interpretation of Robinson-Patman, the Commission found it unnecessary to sift and weigh Boise’s evidence of absence of injury. All those days of trial before the AU were, it seems, largely for naught. In reaching this odd result, the Commission simply failed to determine whether Boise’s evidence demonstrated that no injury or “reasonable possibility” of competitive injury existed. See Falls City, 460 U.S. at 434-35, 103 S.Ct. at 1288.
First. Important among the salient facts that the Commission chose to ignore was the AU’s finding that the selected dealers were not wallowing in a hopeless or deteriorating environment. Quite to the contrary, as we have already recounted, the AU found that all selected dealers for which data was available enjoyed an increase in sales and gross profits in excess of 22% annually during the period in question, despite the recessionary condition of the economy. AU Finding 431, J.A. at 121-22. Indeed, Judge Parker observed that various indicators showed high profitability and financial health on the part of the selected dealers. Id. 433-34, J.A. at 123-24. Although we need not decide the matter, this tends, if anything, to point to an absence of “lost profits” of the sort described in Falls City as one possible manifestation of injury to competition; accordingly, this evidence merited consideration by the Commission rather than the out-of-hand dismissal that it received.
There is yet another portion of the record relating to profitability left unexamined by the Commission and, in our view, deserving of attention in reaching a reasoned result. As computed by the Commission’s accounting expert, Mr. Rowe, the selected dealers’ median net profit before taxes as a percent of sales over the years 1976 to 1981 ranged from 2.3% to 3.5%. Id. 430, J.A. at 121. Their net profit was thus apparently lower than those of dealer-members of NOPA, whose net profit ranged from 3.0% to 3.9% from 1967 to 1980. Id. 423-27, J.A. at 120-21. See supra text at 1135. Although these statistics pose obvious comparative problems (in light of the fact that they are spread across different years and were computed by different entities), this apparent discrepancy in profitability obviously deserved consideration. But it received none. Likewise, the Commission failed to *1145analyze the relationship of Boise’s higher net profit (which, of course, reflected both its sales as a wholesaler and a dealer) to that of the selected dealers. See supra text at 1135.
In addition, the evidence, as found by the AU, failed to demonstrate “displaced sales,” another form the Falls City Court indicated injury could take. The AU found that switches of accounts from one supplier to another were “not uncommon”; to the contrary, they were the order of the day. Id. 422, J.A. at 120. See supra text at 1135. While on the one hand twenty-one of the twenty-three dealers testified that they had lost accounts to Boise’s lower prices or better service in recent years, AU Finding 384, J.A. at 112-13; see also id. 385-406, J.A. at 113-17, the phenomenon of lost accounts was very much a two-way street. As the AU extensively recounted, Boise also lost accounts and it too was unable to meet competitors’ prices in some instances. See AU Finding 408-21, J.A. at 117-20. (The list is long, and as we have provided various examples, see supra text at 1136, we will avoid the temptation common in antitrust cases of proliferating the record. Automatic Canteen, 346 U.S. at 65-66 & n. 3, 73 S.Ct. at 1020-21 & n. 3.) Indeed, considered together, the number of accounts that switched from the selected dealers to Boise was quite small. See supra text at 1135-1136. And the proportion of switched accounts to a dealer’s total accounts was strikingly low. Whereas a typical dealer might have a thousand accounts (or more), only a handful of accounts were shown to have switched. On top of that, the reasons for the switches were manifold. The following finding by Judge Parker makes the key point:
None of the selected dealers who lost accounts in whole or in part to Boise were able to conclude that the losses were due to the different prices charged them and Boise by the six manufacturers (citations omitted).
Id. 407, J.A. at 117. In short, the switches to Boise apparently cannot be explained as sales diverted through operation of the wholesale discount. 15
Second. To explain its refusal to consider Boise’s evidence (and, indeed, the countervailing evidence) of absence of actual competitive injury, the Commission asserted that “the competitive injury requirement of Section 2(a) is satisfied by a showing of ‘a reasonable possibility that a price *1146difference may harm competition.’ ” Commission Decision, J.A. at 192 (quoting Falls City, 460 U.S. at 434-35, 103 S.Ct. at 1288). While true, that principle does not justify abdication of the duty to consider evidence indicating that a “reasonable possibility” of harm does not, in fact, exist in the particular industry. Robinson-Patman has not ushered in a bizarre rule of law that exalts theory “no matter what” in the face of hard, cold facts. That curious rule, if it ever was a rule, has been scotched by Falls City’s teaching.16
In this case, the Commission is attacking a long-established, widespread practice within a vibrant, dynamic industry. The AU specifically found that the wholesale discounts are no new-fangled concoctions. For example, Bates, a distinguished manufacturer whose products appear to enjoy considerable customer loyalty, “has had its wholesale discount since the 1940’s, and Boise has been receiving that discount from Bates as long as it has been a customer.” AU Finding 302, J.A. at 97. Forty years is a long time for evil, anticompeti-tive practices to have flourished unchallenged either by Washington, D.C. regulators or private entities which find themselves on the short end of the discount stick. Much the same can be said of Master Products. That firm’s system of wholesale discounts has been unchanged for almost 40 years. Id. 345, J.A., at 105. So too with Boorum & Pease, whose evenhanded pricing structure has been in effect for many years. Id. 263, J.A. at 91.
To be sure, the prevalence and longstanding nature of the discounts does not preclude the possibility that the discount regime posed a threat of injury to competition in the future. In light of the flourishing condition of the industry generally and the selected dealers specifically, however, one would reasonably expect that any potential for injury, if indeed there was one, would have manifested itself by now in the form of some dragging down. As yet, however, there appears to be no such damper.17
Third. In assuming, without analysis, the existence of competitive injury, we believe that the Commission erred in another way as well. It entirely failed to inform its application of Morton Salt’s inference of injury with the purposes of the Robinson-Patman Act. As we have previously detailed, see supra text at 1138-1139, it is *1147fairness, as Congress perceives it, that Robinson-Patman is all about. That Act, a legislative monument to smallness in a century which rewards bigness, is aimed at putting a halt to singling out the “Big Fives” and “Big Threes” of the world for disparately favorable treatment (unless, of course, a statutory defense lies).
This is not a case of the “Big Five” retailers (Morton Salt), the “Big Three” book distributors (Doubleday), the long-established, large jobbers who enjoyed manufacturer protection from uppity newcomers (Muller) or the Hoosier beer distributor which happened to be on the “wrong” side of the Indiana-Kentucky state line (Falls City). Quite to the contrary, there is among the six manufacturers selected in this case no regime of favoritism towards Boise. There is not the slightest hint in the AU’s opinion, or in the Commission’s for that matter, that the manufacturers were singling out Boise (and other big fish) for disparately favorable treatment. Rather, in accordance with a practice prevalent well before Boise even entered the industry, it is undisputed that the six manufacturers in question treated all wholesalers alike and provided the wholesale discount to Boise solely because it met their respective definitions of “wholesaler. ” There is simply no cabal between Boise and the six manufacturers to give Boise an additional price break.18
To recap briefly, there are five national wholesalers, ALJ Finding 26, 28, J.A. at 50-51, of which Boise is one of the two largest, and a host of smaller wholesalers. The “little fish” are typically “small, privately-owned businesses with annual volumes of under $10 million.” Id. 27, J.A. at 51. Judge Parker’s findings of fact show beyond doubt that equal treatment of all that qualify as “wholesalers,” whether great or small, is the order of the day as to all six selected manufacturers. See, e.g., id. 447, J.A. at 127-28 (Rediform); id. 450, J.A. at 128 (Sheaffer-Eaton); id. 449, J.A. at 128 (Kardex); id. 451, J.A. at 128 (Boo-rum & Pease); id. 452, J.A. at 128-29 (Bates); id. 453, J.A. at 129 (Master Products).
This evenhandedness might strike Robinson-Patman aficionados as a rather odd choice as a basis for a claim of illegal price discrimination. Indeed, one attuned to such matters might more naturally expect that, if such a discrimination claim were to lie, the charge would be (1) that Boise (and perhaps the other national wholesalers, “the Big Five,” as it were) was receiving higher discounts than smaller firms that qualified as “wholesalers,” see e.g., Automatic Canteen, 346 U.S. 61, 73 S.Ct. 1017, Morton Salt, 334 U.S. 37, 68 S.Ct. 822, or (2) that Boise had coerced the manufacturers into framing their “wholesaler” definitions in a manner favorable to Boise’s method of doing business. In either of these contexts, one could readily understand why the Robinson-Patman complaint would be levelled against Boise as a power buyer exerting its muscle to win additional pricing concessions from amenable, or at least nervous, vendors anxious to please the big-fish buyer. But, again, that is not this case. Boise has not been accused of piggishly demanding more than its equal share at the wholesale discount trough.
Fourth. We note, finally, the irony of the Commission’s concept of Robinson-Pat-man liability, namely that these egalitarian-minded manufacturers with their long-settled commercial practices now stand condemned as price discriminators in violation of federal law. As the Supreme Court has made abundantly clear, a buyer’s liability under section 2(f) is entirely derivative in nature. Great A & P Tea Co., 440 U.S. at 76-77, 99 S.Ct. at 931. See supra text at 1129. For there to be a guilty buyer, there must be a guilty seller. And thus it cannot pass unnoticed that under the Commission’s approach, Bates, Master Products, Boorum & Pease and the other three manufacturers have run afoul of Robinson-Pat-man even though they have followed neutral, objective criteria in determining what buyers are to be considered wholesalers. *1148It cannot be clearer that the Commission’s sweeping attack, not narrowly focused on some anti-competitive, discriminatory pocket within an industry, carries with it dangers that the FTC is marching rapidly down a road leading to a regime of “price uniformity and rigidity” that has long stood condemned by the Supreme Court as antithetical to our law. This is nothing less than an all-out attack on uniform wholesale prices to dual distributors. Id. at 80, 99 S.Ct. at 933; Automatic Canteen, 346 U.S. at 63, 73 S.Ct. at 1019.
In sum, although the Commission (and the AU) correctly took the view that the Morton Salt inference is rebuttable, its rejection on relevancy grounds of Boise’s evidence of the absence of competitive injury (or reasonable possibility of competitive injury) was in error.19 The petition for review is therefore granted, and the case is remanded for further proceedings consistent with this opinion.
It is so ordered.