
491 F.Supp.2d 1283 (2007)
HUSTEEL COMPANY, LIMITED and Seah Steel Corporation, Limited, Plaintiffs,
v.
UNITED STATES, Defendant, and
IPSCO Tubulars, Incorporated, Lone Star Steel Company, Incorporated, and Maverick Tube Corporation, Defendants-Intervenor.
Slip Op. 07-74, Court No. 06-00075.
United States Court of International Trade.
May 15, 2007.
*1284 Troutman Sanders LLP (Donald B. Cameron, Julie C. Mendoza, R. Will Planert, Jeffery S. Grimson, and Brady W. Mills), Washington, DC, for Plaintiffs.
Peter D. Keisler, Assistant Attorney General, Jeanne E. Davidson, Director, Patricia M. McCarthy, Assistant Director, Commercial Litigation Branch, Civil Division, United States Department of Justice (David F. D'Alessandris), for Defendant.
Schagrin Associates (Roger B. Schagrin, Brian E. McGill, and Michael J. Brown), Washington, DC, for Defendants-Intervenor.

OPINION & ORDER
CARMAN, Judge.
The matter before this Court is Plaintiffs' Husteel Co., Ltd. ("Husteel") and SeAH Steel Corp., Ltd. ("SeAH") Rule 56.2 Motion for Judgment upon the Agency Record ("Motion for Judgment upon the Agency Record"). Plaintiffs challenge the Department of Commerce's ("Commerce") decision to exclude certain of Plaintiffs' sales price data from the calculation of normal value during the ninth administrative review of the antidumping order on Oil Country Tubular Goods ("OCTG") from Korea.[1] Because Commerce's decision to exclude the data is not supported by substantial *1285 evidence on the record, this Court grants Plaintiffs' Motion for Judgment upon the Agency Record and remands to Commerce the final results in Oil Country Tubular Goods, Other Than Drill Pipe, from Korea, 71 Fed.Reg. 13,091 (Dep't Commerce Mar. 14, 2006) (final results of antidumping duty administrative review) ("Final Results") for action consistent with this opinion.

PROCEDURAL HISTORY
Plaintiffs participated as foreign respondents in the underlying administrative action giving rise to this case, the ninth administrative review of the antidumping order on Oil Country Tubular Goods ("OCTG") from Korea. In the Final Results of the administrative review, and over Plaintiffs' objections, Commerce excluded from the respective calculations of normal value Plaintiffs' sales of OCTG to Korean trading companies that subsequently exported the merchandise to the People's Republic of China ("China"): Plaintiffs timely sought judicial review of the issue in this Court.

BACKGROUND
A. Plaintiffs' Sales During the Period of Review
Plaintiffs are Korean manufacturers of OCTG that is subject to an antidumping duty order. See Final Results, 71 Fed. Reg. at 13,091. Each Plaintiff reported to Commerce its sales of OCTG during the period of review, August 1, 2003 through July 31, 2004, in order for Commerce to use those sales to calculate each Plaintiffs normal value. Rusted reported that it did not sell OCTG for consumption in the Korean home market during the period of review. (Resp. of Husteel Co., Ltd. to Section A of the Dep't of Commerce's Antidumping Duty Questionnaire 1 (Jan. 5, 2005) ("Husteel's Section A Resp."), Pub. R. Doc. 25.) SeAH reported that it sold OCTG for consumption in the Korean home market, but that those sales could not be used to calculate SeAH's normal value because they accounted for less than five percent of the volume of the company's sales to the United States. (Resp. of SeAH Steel Corp., Ltd. to Section A of the Dep't of Commerce's Antidumping Duty Questionnaire A-3 (Jan. 5, 2005) ("SeAH's Section A Resp."), Pub. R. Doc. 26.) Because neither Plaintiff reported viable home-market sales on which to base its normal value,[2] Plaintiffs also reported their sales to third countries. Husteel reported that its only third-country market was China. (Husteel's Section A Resp. 3.) SeAH reported third-country sales to Canada, China, and Myanmar, though the reported sales to Myanmar fell below the five percent threshold for viability.[3]*1286 (SeAH's Section A Resp. A-3.) Each Plaintiff reported that China was its largest third-country market and that the quantity of OCTG it sold exceeded the five percent threshold for China to be considered a viable third-country market for purposes of calculating normal value. (Husteel's Section A Resp. 3; SeAH's Section A Resp. A-3.)
Plaintiffs explained to Commerce that the sales they reported as "Chinese" were actually made to unaffiliated trading companies operating in Korea that resold the merchandise to buyers in China. (Husteel's Section A Resp. 11; SeAH's Section A Resp. A-14.) Plaintiffs reported the sales to Korean trading companies as sales to China, rather than home-market sales, because Plaintiffs knew at the time of sale that the merchandise would be resold to China.[4] However, Plaintiffs reported to Commerce the invoice price between Plaintiffs and the respective Korean trading companies, not the invoice price between the Korean trading companies and their Chinese customers. (Br. in Supp. of Pls.' Husteel Co. Ltd. & SeAH Steel Corp. R. 56.2 Mot. for J. upon the Agency R. ("Pls.' Br.") 3-4; see also Def.'s Mem. in Opp'n to Pls.' Mot. for J. upon the Agency R. ("Def.'s Mem.") 13 (confirming that "[w]here the producer sells through a reseller with knowledge of the destination, it is the price between the producer and the reseller that is . . . used in the dumping analysis").)
During Commerce's verification of Plaintiffs' data, the agency found no discrepancies between the price data Plaintiffs reported to Commerce for their sales to the Korean trading companies and the documentation relating to those sales. (See Verification of Costs & Sales for Husteel Co., Ltd. in the Admin. Rev. of Oil Country Tubular Goods, Other than Drill Pipe, from Korea 13 (Dec. 28, 2005), Pub. R. Doc 95; Verification of Costs and Sales for SeAH Co., Ltd. in the Admin. Rev. of Oil Country Tubular Goods, Other than Drill Pipe, from Korea 8 (Dec. 28, 2005), Pub. R. Doc. 96.)
Plaintiffs also explained to Commerce the sales process they employed with the Korean trading companies. First, a Korean trading company requested a price quote for a specific quantity, specification, and delivery date for OCTG. (Husteel Confid. Verification Exh. 21 at 1, 3-4A, Confid. R. Doc 60; SeAH Confid. Verification Exh. 7 at A-B, Confid. R. Doc. 59); see also Pls.' Br. 4. Plaintiffs then made an offer to the Korean trading company. If Plaintiffs' offer was accepted by the Korean trading companies, Plaintiffs and the Korean trading companies entered a contract. Plaintiffs delivered the OCTG to the trading company at the Korean port of departure, whereupon the trading company paid for the merchandise. (Husteel Confid. Verification Exh. 21 at 4-4A; SeAH Confid. Verification Exh. 7 at B). Plaintiffs represented to Commerce that they were not involved in negotiating the price at which the trading companies sold the OCTG to the Chinese buyers, and any claims made by the Chinese customers were made to the Korean trading companies, not to Plaintiffs. (Husteel Confid. *1287 Verification Exh. 21 at 3-4A; SeAH Confid. Verification Exh. 7 at B).
B. The Administrative Review
During the underlying administrative review, Plaintiffs argued that Commerce should use their "Chinese"[5] sales to calculate normal value because the sales satisfy the three statutory requirements set out in 19 U.S.C. § 1677b(a)(1)(B)(ii): (1) the sales are of sufficient quantity; (2) the sales are not subject to a "particular market situation;" and (3) the price for those sales is "representative," because Plaintiffs sold the OCTG in arm's-length, market-economy transactions to unrelated Korean trading companies. (See, e.g., Letter from Kaye. Scholer LLP to the Hon. Carlos Gutierrez, Sec'y of Commerce (Jan. 17, 2006), Pub. R. Doc. 100.)
Commerce disagreed with Plaintiffs' assertion that the price of their sales is "representative." Commerce noted that China is classified as a nonmarket economy and that "sales made in [nonmarket economies] are not representative because the prices for such sales are not determined on the basis of market principles." (Issues & Decision Mem. for the Final Results of the Admin. Rev. of the Antidumping Duty Order on OCTG from Korea 8 (Mar. 7, 2006) ("Issues & Decision Mem.").) Commerce explained that
[nonmarket economy] prices, as a general rule, are not meaningful measures of value because they do not sufficiently reflect market-determined demand conditions or the relative scarcity of the resources used in production. Specifically, the demand and supply elements that individually and collectively make a market-based price system work and, as a consequence, make market-based prices and costs meaningful measures of value, are absent in [nonmarket economies.] Moreover, foreign suppliers to [nonmarket economies] are often competing with domestically set prices. Therefore, sales into [a nonmarket economy] may very well not be at prices that reflect the fair value of the merchandise. Therefore, sales prices into [a nonmarket economy] cannot be considered to be "representative," as required by the statute.
(Id. (internal citations omitted).)
On that basis, Commerce excluded China from serving as the third-country comparison market to establish Plaintiffs' normal values. Instead, Commerce used Canada as the third-country comparison market on which to base SeAH's normal value. Because Husteel's only reported third-country sales were to China, Commerce calculated the company's normal value on the basis of constructed value.

PARTIES' CONTENTIONS
A. Plaintiffs' Arguments
Plaintiffs argue that Commerce should have used Plaintiffs' Chinese sales price data to calculate normal value because China was the third-country market into which Plaintiffs sold the largest volume of subject merchandise that was most similar to that sold in the United States. (Pls.' Br. 13.) Husteel contends that China should be selected because the company "had no other viable third country market." (Id. at 14.) SeAH argues that China should be selected because the volume of merchandise sold to China was significantly greater than the volume sold to the other viable third-country market, Canada, *1288 and "more importantly, the CCTG sold by SeAH for export to both China and the United States was plain-end pipe, while the OCTG sold to Canada was threaded and coupled and thus not as similar as the exports to China." (Id.)
Plaintiffs assert that Commerce's decision to exclude Plaintiffs' Chinese sales is not supported by substantial evidence on the record and is not otherwise in accordance with law because "there is no basis in the law or on the facts of this case [to support] Commerce's determination" that Plaintiffs' sales are not "representative." (Pls.' Br. 15.) First, Plaintiffs point out that the sales in question occurred "between two unaffiliated companies in a market economy country," (id. at 17) and complain that "Commerce has not, and could not, point [sic] to any record evidence to support the notion that [Plaintiffs'] OCTG sales are anything but arm's-length prices to a market economy purchaser" (id. at 18). Plaintiffs argue that "Commerce does not explain how the prices between two unaffiliated companies in a market economy country are influenced by the fact that the goods are ultimately delivered to China." (Id. at 17.)
Second, Plaintiffs argue that in two previous antidumping administrative reviews (not involving Plaintiffs) Commerce "used China as the third-country market for the purpose of determining normal value." (Id. at 26.) Moreover, Plaintiffs stress that Commerce regularly uses prices from sales between a seller located in a market economy and a buyer located in a nonmarket economy to calculate normal value:
Pursuant to Commerce's regulations [19 C.F.R. § 351.408(c)(1)], there is a preference for calculating normal value in [a nonmarket economy] case using prices paid by the [nonmarket economy] producer in a market economy currency to market economy suppliers for the [nonmarket economy producer's factors of production].[6] Thus, contrary to the Final Results, Commerce does not reject prices from market economy suppliers simply because the purchaser is located in [a nonmarket economy].
(Id. at 20 (footnote added).)
B. Defendant's and Defendants-Intervenor's Arguments[7]
Defendant (the "Government") contends that Commerce's decision to exclude Plaintiffs' Chinese sales price data is supported by substantial evidence and is otherwise in accordance with law. The Government points out that the term "representative" is not defined in the statute or regulations and argues that Commerce therefore has the latitude to interpret the term in a reasonable manner. (Def.'s Mem. 11.) The Government argues that "sales between actors in market economy countries cannot be compared to sales where one side of the transaction is a nonmarket entity" (id.), and it is therefore reasonable for Commerce to find Plaintiffs' sales to be *1289 unrepresentative. Defendants-Intervenor add that record evidence demonstrates that Plaintiffs sales were not made at market prices. "The differential in prices between SeAH's Chinese sales and their sales to market economies Canada and the United States supports Commerce's finding that the prices of [P]laintiffs' Chinese sales are not representative of prices between a market-economy buyer and a market-economy seller." (Opp'n of Def.-Intervenors to Pls.' Mem. in Supp. of Their R. 56.2 Mot. for J. on the Agency R. ("Defs.-Int.'s Mem.") 17.)
In response to Plaintiffs' argument that the relevant sales in this case were not made to a nonmarket entity, but, rather, to trading companies located in Korea, the Government states that "Commerce properly determined that the involved sales were sales in China because [Plaintiffs] had knowledge of the destination of the merchandise." (Def.'s Mem. 13.) The Government also distinguishes the two instances cited by Plaintiffs where Commerce accepted Chinese sales data to calculate a respondent's normal value. The first instance "was decided pursuant to the pre-[Uruguay Round Agreements Act] statute, which did not contain the requirement that prices be `representative';" and no party raised the issue of the appropriateness of using Chinese prices as the basis for normal value in the second instance. (Id. at 22.)
Further, the Government contends that Commerce does not regularly accept price data for sales between market-economy suppliers and nonmarket-economy buyers to calculate normal value. The Government explains that Commerce accepts this data only to value factors of production in nonmarket cases, but not to value the subject merchandise itself, which is what Plaintiffs asked Commerce to do in the instant case. Defendants-Intervenor add that the standard of reliability for the price data differs in the two cases. (Defs.-Int.'s Mem. 2.) In the instant case, the sale price of subject merchandise must be "`representative,'" whereas when valuing factors of production, the price data need only be the "`best information available.'" (Id.) Defendants-Intervenor conclude that, "[t]here is, accordingly, good reason for Commerce's different treatment of sales" in the two types of cases. (Id. at 9.)
Defendants-Intervenor lastly argue that even if this Court determines that the Chinese sales prices are "representative," China would not be the proper third-country comparison market for SeAH. Defendants-Intervenor contend that Commerce should continue to use price data from SeAH's Canadian sales to calculate SeAH's normal value because the merchandise the company sold to Canada was more similar to the U.S. merchandise than that sold to China. (Id. at 18-19.)

JURISDICTION
This Court has jurisdiction to review Commerce's final determination in an administrative review of an antidumping duty order pursuant to 28 U.S.C. § 1581(c) (2000).

STANDARD OF REVIEW
In reviewing a challenge to Commerce's final determination in an antidumping administrative review, this Court will "hold unlawful any determination, finding, or conclusion found . . . to be unsupported by substantial evidence on the record, or otherwise not in accordance with law." 19 U.S.C. § 1516a(b)(1)(B)(i) (2000). Commerce's factual determinations must be supported by substantial evidence on the record, AU. Sugar, Ltd. v. United States, 744 F.2d 1556, 1559 (Fed.Cir.1984); its interpretations of the antidumping statute must be in accordance with law, Chevron U.S.A., Inc. v. Natural Resources Defense Council, 467 U.S. 837, 104 S.Ct. 2778, 81 *1290 L.Ed.2d 694 (1984); Timken Co. v. United States, 354 F.3d 1334, 1341 (Fed.Cir.2004).

DISCUSSION
A. Commerce's Interpretation of "Representative" is in Accordance with Law.
This Court is first charged with determining whether Commerce's interpretation of the statutory term at issue is in accordance with law. Commerce's interpretation of the antidumping statute is reviewed pursuant to the two-step process set forth in Chevron. Under the first step, the Court determines "whether Congress has directly spoken to the precise question at issue. If the intent of Congress is clear, that is the end of the matter; for the court, as well as the agency, must give effect to the unambiguously expressed intent of Congress." Chevron, 467 U.S. at 842-43, 104 S.Ct. 2778; accord Timken, 354 F.3d at 1341. If, however, "the statute is silent or ambiguous with respect to the specific issue, the question for the court is whether the agency's answer is based on a permissible construction of the statute." Chevron, 467 U.S. at 843, 104 S.Ct. 2778; accord Timken, 354 F.3d at 1342. To determine whether Commerce's statutory interpretation is permissible, the court considers several factors, including "the express terms of the provisions at issue, the objectives of those provisions and of the antidumping scheme as a whole." Mitsubishi Heavy Indus., Ltd. v. United States, 22 CIT 541, 545, 15 F.Supp.2d 807 (1998).
Here, the statutory term at issue is "representative." Commerce may use third-country sales price data to calculate normal value provided  among other criteria  that "such price is representative." 19 U.S.C. § 1677b(a)(1)(B)(ii)(I). The court in Alloy Piping Products, Inc. v. United States, 26 CIT 330, 339, 201 F.Supp.2d 1267 (2002), found that "[n]either the statute, legislative history, nor regulations define `representative'." The question for this Court, then, is whether Commerce's interpretation is a permissible construction of the statute.
Commerce defined the term "representative" to mean "determined on the basis of market principles."[8] (Issues & Decision Mem. 8.) Commerce's interpretation appears consistent with the purpose of the of the antidumping statute, which is to calculate dumping margins as accurately as possible. Rhone Poulenc, Inc. v. United States, 899 F.2d 1185, 1191 (Fed.Cir. 1990). To this end, Commerce ensures that normal value represents the fair value of subject merchandise by requiring that the underlying price of the subject merchandise is "determined on the basis of market principles." (Issues & Decision Mem. 8.) As such, this Court holds that Commerce's interpretation of "representative" is permissible.
B. Commerce's Determination that Plaintiffs' Chinese Sales Were Not Representative is Not Supported by Substantial Evidence on the Record.
Commerce's factual determinations must be supported by substantial *1291 evidence on the record. 19 U.S.C. § 1516a(b)(1)(B)(i). Substantial evidence is "more than a mere scintilla. It means such relevant evidence as a reasonable mind might accept as adequate to support a conclusion." Consol. Edison Co. v. NLRB, 305 U.S. 197, 229, 59 S.Ct. 206, 83 L.Ed. 126 (1938); accord Matsushita Elec. Indus. Co. v. United States, 750 F.2d 927, 933 (Fed.Cir.1984). An agency's determination is not supported by substantial evidence where the agency fails to adequately explain the basis on which the agency made its decision. Viraj Forgings, Ltd. v. United States, 28 CIT ___, 350 F.Supp.2d 1316, 1320 (2004) (agency action unlawful where the agency "failed to provide an adequate basis for its conclusions"); see also Motor Vehicle Mfrs. Ass'n v. State Farm Mut. Auto. Ins. Co., 463 U.S. 29, 43, 103 S.Ct. 2856, 77 L.Ed.2d 443 (1983) (agency action arbitrary and capricious[9] where the agency has "entirely failed to consider an important aspect of the problem"); Elec. Consumers Res. Council v. FERC, 747 F.2d 1511, 1513 (D.C.Cir.1984) (agency decisions must be "reached by `reasoned decisionmaking,' including an examination of the relevant data and a reasoned explanation supported by a stated connection between the facts found and the choices made").
Here, Commerce did not adequately explain its basis for finding that the prices of Plaintiffs' sales to Korean trading companies are not "representative." Commerce's explanation began with the premise that "[nonmarket economy] prices, as a general rule, are not meaningful measures of value because they do not sufficiently reflect market-determined demand conditions or the relative scarcity of the resources used in production." (Issues & Decision Mem. 8.) Commerce then reasoned that "foreign suppliers to [nonmarket economies] . . . often compet[e] with domestically set prices. Therefore, sales into [a nonmarket economy] may very well not be at prices that reflect the fair value of the merchandise." (Id.) Commerce excluded Plaintiffs' price data, declaring that "sales prices into [a nonmarket economy] cannot be considered to be `representative,' as required by the statute." (Id.) However, Commerce's determination is missing an adequate explanation of (1) why Plaintiffs' sales should be treated as sales into nonmarket economy; and (2) why Commerce treated Plaintiffs' price data differently than it treats price data for sales from market-economy suppliers to nonmarket-economy buyers in analogous antidumping cases.
1. Commerce did not adequately explain why it found that Plaintiffs' sales should be treated as sales "into a nonmarket economy."
Commerce did not adequately explain why it found that Plaintiffs' sales to unrelated Korean trading companies should be treated as sales into a nonmarket economy. Plaintiffs sold OCTG to trading companies organized under the laws of and operating in Korea. Korea is a market economy. Furthermore, Plaintiffs explained to Commerce that the price data they submitted represents the invoice price between Plaintiffs and the Korean trading companies and Commerce verified the accuracy of these data. It was the Korean trading companies that sold the OCTG to buyers in China. However, the trading companies are unrelated to Plaintiffs, and Commerce did not present a *1292 justification to attribute the unrelated trading companies' sales to Plaintiffs.
Commerce made much of the fact that Plaintiffs' sales are properly classified as sales to China. This Court does not take issue with Commerce's requirement that respondents classify sales as to a third country if, at the point the seller negotiates the sale, the seller knows, or should have known, that the merchandise will be exported to that third country. See LG Semicon Co., Ltd. v. United States, 1999 WL 1458844, 23 CIT 1074, 1075 (1999). At the time that Plaintiffs negotiated their sales with the Korean trading companies, they knew that the Korean trading companies would resell the OCTG to customers in China and, therefore, classified their sales to the Korean trading companies as sales to China. Yet, there is a difference between the classification of Plaintiffs' transactions and the underlying factual circumstances of them.[10]
Plaintiffs are organized under and operate in Korea, a market economy, and are unrelated to their Korean trading company customers. It is trivial to say that, absent evidence to the contrary, sales negotiated between unrelated parties operating in a market economy are assumed to be at market prices. The only factual distinction from a typical transaction between two unrelated market-economy participants that Commerce pointed to was Plaintiffs' knowledge that the merchandise would be resold to China (and, hence, Plaintiffs' classification of the sales as Chinese). However, Commerce did not explain the significance of Plaintiffs' knowledge that the OCTG they sold to the Korean trading companies was destined for China. Commerce does not offer any explanation of why, or evidence that, the price between Plaintiffs and the trading companies was affected by the country into which the subject merchandise would subsequently be sold. Further, Commerce does not explore why the factual circumstances of Plaintiffs' transactions should be treated any differently than if the Korean trading companies had resold the subject merchandise into a market economy or into a nonmarket economy without Plaintiffs' knowledge.[11] Without a logical or factual link between Plaintiffs' knowledge that the merchandise was to be resold to China and the distorted prices within China, Commerce cannot justify treating Plaintiffs' sales as sales into a nonmarket economy. Because Commerce did not provide a "reasoned explanation *1293 supported by a stated connection between the facts found and the choices made," Elec. Consumers, 747 F.2d at 1513, this Court finds that Commerce's decision to exclude Plaintiffs' price data is not supported by substantial evidence on the record.
2. Commerce's treatment of Plaintiffs' price data is inconsistent with its usual treatment of sales from market-economy sellers to nonmarket-economy buyers.
Even if Commerce had adequately explained why it treated Plaintiffs' sales to Korean trading companies as sales into a nonmarket economy, Commerce's explanation is unsatisfactory in another respect. Commerce's treatment of Plaintiffs' price data is inconsistent with its usual treatment of sales from market-economy sellers to nonmarket-economy buyers. In nonmarket cases, Commerce regularly calculates normal value using price data from sales between market-economy sellers and nonmarket-economy buyers. See 19 C.F.R. § 351.408(c)(1) (2006). Here, however, Commerce excluded Plaintiffs' price data on the ground that Plaintiffs (located in the market economy of Korea) sold the merchandise to buyers located in China (a nonmarket economy).[12] An agency acts impermissibly when it treats similar situations in a manner that is "internally inconsistent," NSK Ltd. v. United States, 390 F.3d 1352, 1357 (Fed.Cir.2004), and fails to "reasonably explain[] the inconsistency," id. at 1358.
Consider a transaction between A, a seller of automobile engines operating in a market economy, and B, an automobile manufacturer located in a nonmarket economy. A sells an automobile engine to B, which B uses to manufacture an automobile. If B is investigated for dumping automobiles, Commerce would calculate normal value for B's automobiles in a different manner than in an ordinary antidumping case, like the instant one, where the respondent is located in a market economy. Instead of using the price at which B sells its automobiles, Commerce would calculate normal value by adding together the costs of the various factors of production of the automobile. See 19 U.S.C. § 1677b(c). Typically, Commerce estimates the costs of the factors of production using the prices of the inputs in a market-economy country similar to the nonmarket-economy country in which the respondent operates. For example, Commerce might use the price of a similar automobile engine in India to estimate the cost of the engine B used to manufacture its automobile.
However, where a respondent purchases an input from a market-economy supplier, Commerce prefers to use the actual price the respondent paid for the input rather than an estimated, cost of the input. See 19 C.F.R. § 351.408(c)(1). The Court of Appeals for the Federal Circuit has held that where a nonmarket respondent buys an input from a market-economy supplier "accuracy, fairness, and predictability are enhanced by using" the price paid for the input, rather than the estimated cost. Shakeproof Assembly Components Div. of Ill. Tool Works, Inc. v. United States, 268 F.3d 1376, 1382 (Fed.Cir.2001). Further, in Shakeproof Commerce stated that the sale between the market-economy supplier and the nonmarket-economy respondent resulted in "an actual price determined by market economy forces" that was "both reliable and accurate." Id. at 1380 (quotation *1294 and citation omitted). Thus, in the example above, Commerce would use the price B paid to A for the automobile engine to calculate the normal value of the automobile.
Yet, in the instant case, Commerce did not allow Plaintiffs to use similar price data to calculate the normal value of OCTG. Commerce excluded the price data for sales by Plaintiffs (located in the market economy of Korea) to buyers located in China (a nonmarket economy). Commerce did so on the ground that sales by Plaintiffs to the Chinese buyers "may very well not be at prices that reflect the true value of the merchandise."[13] (Issues & Decision Mem. 8.) This was merely an assumption on the part of Commerce, as the agency made no findings that the actual prices paid to Plaintiffs did not reflect the fair value of the OCTG.
Applying the reasoning Commerce used in the instant case to the hypothetical outlined above, Commerce would allow B to calculate the normal value of an automobile using the price B paid to A for the automobile engine, but would not allow A to use that same price to calculate the normal value of the engine. Commerce's practice to accept the price in the former instance while denying it in the latter is "internally inconsistent." See NSK 390 F.3d at 1357. Either the price of the sale between A and B is "an actual price determined by market economy forces" that is "both reliable and accurate," Shakeproof 268 F.3d at 1380, as Commerce claims in nonmarket cases, or it is a price "that may very well not . . . reflect the fair value of the merchandise," (Issues & Decision Mem. 8), as Commerce claimed in the instant case. It cannot be both.
The Government purports to explain the inconsistency by stating that in nonmarket cases the price data is used to value only "a single input used in the calculation of normal value" whereas in the instant case the price would serve as "the entire basis for normal value." (Def.'s Mem. 18.) This is a distinction without a difference. If the price between a market-economy supplier and a nonmarket-economy buyer is a reliable price determined on the basis of market principles, it should make no difference whether Commerce is using that price to calculate only part or all of the normal value. Contrariwise, if the price is distorted by virtue of being sold to a buyer located in a nonmarket economy, Commerce would not be able to use it in either instance. (See id. at 20 (Commerce must "disregard market-economy input purchases when there is evidence that the prices for such inputs may be distorted.").) Therefore, the Government's distinction does not explain why Commerce accepts these prices to calculate factors of production in nonmarket cases, but not to establish the price of the subject merchandise in the instant case.
The Government's and Defendants-Intervenor's other attempt to distinguish the two situations is similarly unpersuasive. They contended that in the instant case the price must be "representative," whereas in nonmarket cases the price need only be the "best information available" for Commerce to use it. (Def.'s Mem. 18; Defs.-Int.'s Mem. 8-9.) As discussed above, Commerce has found in the nonmarket case context that prices for sales *1295 from market-economy sellers to nonmarket-economy buyers are "determined by market economy forces." Shakeproof, 268 F.3d at 1380. In the instant case, Commerce defined "representative" to mean "determined on the basis of market principles." (Issues & Decision Mem. 8.) Therefore, there appears to this Court no reason to treat the price data for sales between a market-economy supplier and nonmarket-economy buyer differently in the two situations. Because Commerce did not sufficiently explain its inconsistent treatment of the price data, its finding that the Plaintiffs' price data are unrepresentative "is arbitrary and impermissible."[14]NSK 390 F.3d at 1358. On remand, Commerce must give a persuasive explanation for the agency's inconsistent treatment of these sales price data.
3. This Court cannot at this point determine whether Commerce should select Canada or China as the third-country comparison market for SeAH.
An ancillary issue raised by the parties cannot be decided at this point. Defendants-Intervenor argue that China would not be the proper third-country comparison market for SeAH even if Commerce found that Plaintiffs' sales to China are "representative." (Defs.-Int.'s Mem. 18.) If there are multiple third-country markets with eligible prices, Commerce selects as the comparison market the country with the highest volume of sales of subject merchandise that is most similar to that sold in the United States. 19 C.F.R. § 351.404(e). Defendants-Intervenor contend that Canada would still be the proper comparison market if SeAH's sales to China were not excluded because the merchandise SeAH sold to Canada was more similar to the U.S. merchandise than that sold to China. (Defs.-Int.'s Mem. 19.)
However, it is premature for this Court to decide whether Canada or China should be selected as SeAH's third-country comparison market. First, at this point, Canada is SeAH's only viable third-country market. While this Court finds Commerce's decision to exclude China as a viable third-country market unsupported by substantial evidence, the remand will afford Commerce the opportunity to adequately explain its decision. Secondly, Commerce has not yet made findings on the similarity of the OCTG exported by SeAH to both Canada and China as compared to that sold to the United States. This Court's role is to vet Commerce's determinations, not to make them in the first instance. See Nippon Steel Corp. v. United States, 458 F.3d 1345, 1352 (Fed. Cir.2006). That said, if Commerce determines that the price of Plaintiffs' Chinese sales is "representative," Commerce must determine, pursuant to 19 C.F.R. § 351.404(e), whether Canada or China *1296 should be selected as SeAH's third-country comparison market.

CONCLUSION
Because the final determination in Oil Country Tubular Goods, Other Than Drill Pipe, from Korea: Final Results of Antidumping Duty Administrative Review, 71 Fed.Reg. 13,091 (Dep't Commerce Mar. 14, 2006), is not supported by substantial evidence on the record, this Court grants Plaintiffs' Husteel Co., Ltd. and SeAH Steel Corp., Ltd. Rule 56.2 Motion for Judgment upon the Agency Record and remands the final determination to the Department of Commerce for further prosceedings consistent with this opinion.
Upon consideration of the papers submitted by the parties, and upon due deliberation, it is hereby
ORDERED that Plaintiffs' Motion for Oral Argument is denied; it is further
ORDERED that Plaintiffs' Motion for Judgment on the Agency Record is granted; it is further
ORDERED that this case is remanded to the Department of Commerce ("Commerce") to determine whether the price of Plaintiffs' sales for export to the People's Republic of China ("the price") is "representative" within the meaning of 19 U.S.C. § 1677b(a)(1)(B)(ii)(I) (2000); it is further
ORDERED that if Commerce determines that the price is "representative," Commerce will determine pursuant to 19 C.F.R. § 351.404(e) whether China or Canada should be selected as SeAH Steel Corp., Ltd.'s third-country comparison market; and it is further
ORDERED that if Commerce determines that the price is "representative," Commerce will recalculate Plaintiffs' dumping margins accordingly; it is further
ORDERED that the remand results shall be filed no later than July 12, 2007; it is further
ORDERED that Plaintiffs may file papers with the Court indicating whether they are satisfied or dissatisfied with the remand results no later than August 6, 2007; and it is further
ORDERED that Defendant and Defendants-Intervenor may respond to Plaintiffs' comments no later than August 27, 2007.
SO ORDERED.
NOTES
[1]  During an administrative review, Commerce is tasked with calculating a respondent's dumping margin for merchandise subject to an antidumping order ("subject merchandise"). A respondent's dumping margin is the "amount by which the normal value exceeds the export price" for the subject merchandise. 19 U.S.C. § 1673 (2000).

The normal value of subject merchandise is the price at which the respondent first sells the merchandise for consumption in the respondent's home market. Where home-market price is not available, Commerce will use the price at which the respondent first sells the merchandise for consumption in a third country, if: (a) the price is "representative;" (b) the sales are of sufficient aggregate quantity or value; and (c) Commerce does not determine that a "particular market situation" in the third country prevents a proper comparison with the export price. 19 U.S.C. § 1677b(a)(1)(B)(ii) (2000). If there are multiple third-country markets with eligible prices, Commerce selects as the comparison market the country with the highest volume of sales of subject merchandise that is most similar to that sold in the United States. 19 C.F.R. § 351.404(e) (2006). If neither homemarket nor third-country price is available, Commerce will calculate a constructed value for normal value, based on the cost of producing the merchandise. 19 U.S.C. § 1677b(a)(4).
The export price of subject merchandise is "the price at which the subject merchandise is first sold . . . by the producer or exporter of the subject merchandise . . . to an unaffiliated purchaser in the United States or to an unaffiliated purchaser for exportation to the United States." 19 U.S.C. § 1677a(a) (2000).
[2]  In order for the home market to be considered viable, the quantity (or value) or the merchandise sold for consumption in the home market must account for five percent or more of the aggregate quantity (or value) of the subject merchandise sold to the United States. 19 U.S.C. § 1677b(a)(1)(C)(ii) (2000).
[3]  As with home-market sales, the quantity (or value) or the merchandise sold to the third country must account for five percent or more of the aggregate quantity (or value) of the subject merchandise sold to the United States in order for a third-country market to be considered viable. 19 U.S.C. § 1677b(a)(1)(B)(ii)(II).
[4]  Commerce requires that respondents classify sales as to a third country if, when the seller negotiates the sale, the seller knows, or should have known, that the merchandise will be exported to a third country. See LG Semicon Co., Ltd. v. United States, 23 CIT 1074, 1075, 1999 WL 1458844 (1999) (holding that a respondent must report a sale as to the United States rather than as a home-market sale where the respondent knew at the time of sale to a buyer located in the home market that the subject merchandise would be resold to the United States).
[5]  As mentioned previously, the sales in question were not actually made to buyers in China. Plaintiffs sold OCTG to unaffiliated Korean trading companies, and the sales price data Plaintiffs reported represented the invoice price between Plaintiffs and the Korean trading companies, which this Court refers to as the "Chinese" sales price.
[6]  In nonmarket cases, antidumping cases where the respondent alleged to be dumping is located in a nonmarket economy, Commerce "determin[es] the normal value of subject merchandise on the basis of the value of the factors of production utilized in producing the merchandise" plus an amount for expenses and profit. 19 U.S.C. § 1677b(c)(1) (2000). Factors of production are the resources used to manufacture a product or service, including labor, raw materials, energy and utilities consumed, and capital costs. Id. at (c)(3).
[7]  Defendants-Intervenor repeat many of the arguments raised by Defendant. (See generally Opp'n of Def.-Intervenors to Pls.' Mem. in Supp. of Their R. 56.2 Mot. for J. on the Agency R.) This Court will therefore only refer to Defendant's arguments except in instances where the arguments of the two parties differ.
[8]  Commerce has not defined "representative" through formal notice-and-comment rulemaking. However, in the underlying administrative review to this action, the agency found "that the sales made in [nonmarket economies] are not representative because the prices for such sales are not determined on the basis of market principles." (Issues & Decision Mem. 8.) Nevertheless, Commerce's interpretation of this statutory term warrants Chevron deference. See Shakeproof Assembly Components Div. of Ill. Tool Works, Inc. v. United States, 268 F.3d 1376, 1381 (Fed.Cir. 2001) ("Even where Commerce has not engaged in notice-and-comment rulemaking, its statutory interpretations articulated in the course of antidumping proceedings draw Chevron deference.").
[9]  "[S]ubstantial evidence and arbitrary and capricious `connote[] the same substantive standard of review.'" Fujian Mach. & Equip. Imp. & Exp. Corp. v. United States, 25 CIT 1150, 1156, 178 F.Supp.2d 1305 (2001) (quoting Bangor Hydro-Elec. Co. v. FERC, 78 F.3d 659, 663 n. 3 (D.C.Cir.1996)) (brackets in original).
[10]  Absent factual evidence of Plaintiffs' sales, Commerce might have been justified to fall back on the classification of the sales. However, the substantial evidence standard requires that Commerce look at the whole record, including evidence that reasonably detracts from its conclusion, when making a determination. See Universal Camera Corp. v. NLRB, 340 U.S. 474, 488, 71 S.Ct. 456, 95 L.Ed. 456 (1951) ("The substantiality of evidence must take into account whatever in the record fairly detracts from its weight."). Therefore, because Plaintiffs presented Commerce" with persuasive evidence that their sales were made on the basis of market factors, Commerce should have addressed this evidence in its explanation.
[11]  There is nothing in the record to support Defendants-Intervenor's contention that Plaintiffs' sales price to the trading companies was unduly influenced by the less-than-marketprice Defendants-Intervenor allege that the trading companies received from the Chinese buyers. (Defs.-Int.'s Mem. 17.) Further, Commerce made no findings  theoretical or empirical  that the transactions were influenced by Plaintiffs' knowledge that the merchandise was destined for China. An agency decision will be reviewed on the grounds invoked by the agency, see SEC v. Chenery Corp., 332 U.S. 194, 196, 67 S.Ct. 1575, 91 L.Ed. 1995 (1947), and the courts may not "supply a reasoned basis for the agency's action that the agency itself has not given." State Farm, 463 U.S. at 43, 103 S.Ct. 2856.
[12]  As discussed above, Plaintiffs' sales were not made to Chinese buyers. However, for purpose of this discussion, this Court will assume that Plaintiffs sold to Chinese buyers to highlight the inconsistency in Commerce's positions.
[13]  Commerce explained that foreign suppliers to nonmarket economies often compete with domestically set prices. (Issues & Decision Mem. 8.) Because the domestic prices within a nonmarket economy are "not meaningful measures of value" Commerce assumed that the sales between market-economy suppliers and nonmarket-economy buyers would be similarly distorted. (Id.)
[14]  This Court finds that Commerce adequately distinguished the two instances cited by Plaintiffs (Pls.' Br. 26), where Commerce accepted a respondent's Chinese sales price data to calculate the respondent's normal value. The first instance, OCTG from Argentina, Commerce explained, was decided prior to the addition to the statute of the requirement that third-country prices be "representative" and, therefore, does not support Plaintiffs' allegation that Commerce has previously found Chinese prices to be "representative." (Issues & Decision Mem. 10); see also Oil Country Tubular Goods from Argentina, 60 Fed.Reg. 33,539, 33,540 (Dep't Commerce June 28, 1995) (final determination of sales at less than fair value). In the second instance, Polyester Staple Fiber from Korea, Commerce explained that "no party raised the issue" and the Chinese price data was accepted without objection. (Issues & Decision Mem. 10); see also Certain Polyester Staple Fiber from Korea, 67 Fed.Reg. 63,616; 63,617 (Dep't Commerce Oct. 15, 2002) (final results of antidumping duty administrative review).
