OPINION
The New Mexico Taxation and Revenue Department (the Department) appeals from an order of the district court granting summary judgment to Raytheon Services Industry (Raytheon) and Laguna Industries, Inc., (Laguna) and denying the Department’s own motion for summary judgment. The order required the Department to refund gross receipts taxes paid by Raytheon on services performed for Laguna on the Laguna Pueblo (the Pueblo), an Indian reservation. The primary issue on appeal is whether the Indian trader statutes, 25 U.S.C. §§ 261 to 264 (1988), preempt the Department’s authority to impose a gross receipts tax on Raytheon. Under a second issue, in support of its argument against the district court’s denial of the Department’s motion for summary judgment, the Department argues that no other federal statutes preempt state taxation on the services rendered.
The United States Supreme Court, in Warren Trading Post Co. v. Arizona Tax Commission, 380 U.S. 685, 85 S.Ct. 1242, 14 L.Ed.2d 165 (1965), and Central Machinery Co. v. Arizona State Tax Commission, 448 U.S. 160, 100 S.Ct. 2592, 65 L.Ed.2d 684 (1980), held that the Indian trader statutes preempted a similar tax in connection with transactions involving a sale of goods. We hold that the Indian trader statutes govern trade in services as well as trade in goods. The Department concedes that if we so interpret those statutes, the holdings of Warren Trading Post and Central Machinery compel the conclusion that the Indian trader statutes preempt the taxes imposed by the Department on Raytheon. Because we conclude that the statutes govern trade in services, it becomes unnecessary for us to address the Department’s second issue to determine whether other federal legislation has preempted the Department’s authority to impose the tax. We affirm the district court’s decision.
BACKGROUND
1. Facts.
Laguna Industries, Inc., is a New Mexico corporation wholly owned by the Pueblo of Laguna, an Indian tribe organized under the Indian Reorganization Act, 25 U.S.C. § 476 (1988 & Supp.1992). In the early 1980s, the Pueblo sought to invest capital accumulated from uranium mining operations and to find employment for tribal members who were unemployed because of the decline of the uranium industry. To *646accomplish this purpose, the Pueblo incorporated Laguna with the goal of obtaining federal contracts from the Department of Defense (DOD). To assure DOD that Laguna would be competent to handle these contracts, Laguna contracted with Raytheon, a major defense contractor, for technical, training, and management assistance.
From the Pueblo itself, Laguna received capital investment, a line of credit, and the use of a Pueblo-owned building. Laguna also received assistance, including grants, from various federal programs, including the Administration for Native Americans (ANA) within the Health and Human Services Department, the Small Business Administration (SBA), DOD, the Bureau of Indian Affairs (BIA), and Congress.
Some of the funds for the establishment of Laguna came from an ANA economic development grant of $655,140 to the Pueblo, conditioned on the Pueblo’s receiving a DOD contract under the Buy Indian Program. Other funds were a BIA grant of $500,000, matching funds from the Pueblo of $900,000, a line of credit of $1,500,000 from the Pueblo, a loan from the Pueblo of $127,000, a Pueblo-owned building valued at $1,600,000, and federal funding under the Job Training Partnership Act, 29 U.S.C. §§ 1501 to 1781 (1988) (JTPA), that totalled $147,344.
For more than two years, Raytheon employees worked with Laguna employees on the reservation to provide technical assistance in setting up and operating the business and ensuring quality work. Laguna paid Raytheon from the ANA grant, the Pueblo line of credit and Laguna’s operating profits, the BIA grant, and the JTPA funding. The Raytheon employees lived in Albuquerque and commuted daily to the reservation. Raytheon paid gross receipts tax on its receipts from the contract with Laguna and passed on the cost of those taxes to Laguna. It assigned its right to any tax refund to Laguna.
No New Mexico governmental agency made any capital contribution to Laguna or contributed any funds to pay Raytheon. However, most Laguna employees were educated in New Mexico schools. Raytheon employees lived in Albuquerque and used the roads and other services there. State professional licensing boards ensured the competency of the architects and builders of the Laguna building, the banks and insurance companies Laguna used, and the attorneys handling the litigation.
2. Procedural history.
In 1988, Raytheon and Laguna filed a claim for the refund of $53,750.86 paid by Raytheon to the Department from March 1986 through May 1988. The Department took no action on the claim within 120 days. Raytheon and Laguna then filed an action in district court pursuant to NMSA 1978, Section 7-l-26(A) (Repl.Pamp.1990), challenging the Department’s failure to refund the tax. The parties filed cross motions for summary judgment. The district court granted Raytheon and Laguna’s motion and denied the Department’s motion, ruling that, as a matter of law, the sale of services to the tribe was “trading” under the Indian trader statutes. On that basis, the district court concluded that the Indian trader statutes preempted the state’s authority to impose the tax on Raytheon and ordered the state to refund the taxes paid, together with interest and costs.
3. The state tax.
The Gross Receipts and Compensating Tax Act, NMSA 1978, §§ 7-9-1 to -82 (Repl.Pamp.1990 & Supp.1991), provides for the imposition of a gross receipts tax on any person engaging in business in this state based upon the privilege of engaging in business within New Mexico. § 7-9-4(A). The tax is imposed on the sale of services performed in New Mexico. § 7-9-3(F).
4. The Indian trader statutes.
The Indian trader statutes, 25 U.S.C. §§ 261 to 264, state:
§ 261. Power to appoint traders with Indians
The Commissioner of Indian Affairs shall have the sole power and authority to appoint traders to the Indian tribes and to make such rules and regulations *647as he may deem just and proper specifying the kind and quantity of goods and the prices at which such goods shall be sold to the Indians.
§ 262. Persons permitted to trade with Indians
Any person desiring to trade with the Indians on any Indian reservation shall, upon establishing the fact, to the satisfaction of the Commissioner of Indian Affairs, that he is a proper person to engage in such trade, be permitted to do so under such rules and regulations as the Commissioner of Indian Affairs may prescribe for the protection of said Indians.
§ 263. Prohibition of trade by President
The President is authorized, whenever in his opinion the public interest may require the same, to prohibit the introduction of goods, or of any particular article, into the country belonging to any Indian tribe, and to direct all licenses to trade with such tribe to be revoked, and all applications therefor to be rejected. No trader to any other tribe shall, so long as such prohibition may continue, trade with any Indians of or for the tribe against which such prohibition is issued. § 264. Trading without license; white persons as clerks
Any person other than an Indian of the full blood who shall attempt to reside in the Indian country, or on any Indian reservation, as a trader, or to introduce goods, or to trade therein, without such license, shall forfeit all merchandise offered for sale to the Indians or found in his possession, and shall moreover be liable to a penalty of $500: Provided, That this section shall not apply to any person residing among or trading with the Choctaws, Cherokees, Chickasaws, Creeks, or Seminóles, commonly called the Five Civilized Tribes, residing in said Indian country, and belonging to the Union Agency therein: And provided further, That no white person shall be employed as a clerk by any Indian trader, except such as trade with said Five Civilized Tribes, unless first licensed so to do by the Commissioner of Indian Affairs, under and in conformity to regulations to be established by the Secretary of the Interior.
The United States Supreme Court examined the history of the Indian trader statutes in Warren Trading Post. The Court stated that “from the very first days of our Government, the Federal Government * * * had exercised through statutes and treaties a sweeping and dominant control over persons who wished to trade with Indians and Indian tribes.” Warren Trading Post, 380 U.S. at 686-87, 85 S.Ct. at 1243-44 (footnotes omitted). The Court continued, stating that “[s]uch comprehensive federal regulation of Indian traders has continued from that day to this.” Id. at 688, 85 S.Ct. at 1244. The Supreme Court stated that the Commissioner of Indian Affairs, acting under the authority granted to him under Sections 261 and 262, had:
promulgated detailed regulations prescribing in the most minute fashion who may qualify to be a trader and how he shall be licensed; penalties for acting as a trader without a license; conditions under which government employees may trade with Indians; articles that cannot be sold to Indians; and conduct forbidden on a licensed trader’s premises. He has ordered that detailed business records be kept and that government officials be allowed to inspect these records to make sure that prices charged are fair and reasonable; that traders pay Indians in money; that bonds be executed by proposed licensees; and that the governing body of an Indian reservation may assess from a trader “such fees, etc., as it may deem appropriate.”
Id. at 689-90, 85 S.Ct. at 1245 (footnotes omitted). Present regulations can be found at 25 C.F.R. Parts 140 and 141 (1991). “These apparently all-inclusive regulations and the statutes authorizing them would seem in themselves sufficient to show that Congress has taken the business of Indian trading on reservations so fully in hand that no room remains for state laws imposing additional burdens upon traders.” Warren Trading Post, 380 U.S. at 690, 85 S.Ct. at 1245. Later, in Central Machin *648 ery, the Supreme Court expanded upon the holding of Warren Trading Post, concluding that, in enacting the Indian trader statutes and the regulations under them, “the Federal Government has comprehensively regulated trade with Indians to prevent ‘fraud and imposition’ upon them.” Central Mach. Co., 448 U.S. at 163, 100 S.Ct. at 2594-95. Central Machinery held that it was the existence of the Indian trader statutes themselves, and not their administration, that preempted the imposition of the tax. Id. at 165, 100 S.Ct. at 2596. Thus, although the trader was not licensed to engage in trading with Indians, as required by the Indian trader statutes and the regulations under them, the Court held that imposition of the tax was nonetheless preempted. Id. at 164-65, 100 S.Ct. at 2595-96. The Court also considered it irrelevant that the sale was made to a tribal enterprise, as occurred in this appeal, rather than directly to the tribe itself. Id. at 164 n. 3, 100 S.Ct. at 2595 n. 3.
DISCUSSION
The Department concedes that the Supreme Court’s decisions in Warren Trading Post and Central Machinery are still good law and that, under them, the Indian trader statutes preempt state taxes on activities within the scope of the statutes.1 We should also note that the Department, in arguing its second issue (which, as we previously noted, we need not address), although contending that Cotton Petroleum Corp. v. New Mexico, 490 U.S. 163, 109 S.Ct. 1698, 104 L.Ed.2d 209, (1989), marks “a significant change of direction of the Supreme Court on its preemption analysis,” concedes that that recent case did not overrule Warren Trading Post or Central Machinery. Additionally, Cotton Petroleum did not concern itself with the Indian trader statutes.2
The dissent maintains that the district court’s decision was not proper in a summary judgment posture. Summary judgment is appropriate when there are no genuine issues of material fact and the movant is entitled to judgment as a matter of law. SCRA 1986, 1-056(C) (Repl.1992). Under the facts of this appeal, the facts are not in dispute; the issue is the proper interpretation of the relevant statutes. Interpretation of a statute is a question of law. See Carpenter v. Arkansas Best Corp., 112 N.M. 1, 2, 810 P.2d 1221, 1222 (1991). Additionally, the legal effect of undisputed facts is a question of law. Westgate Fami *649 lies v. County Clerk, 100 N.M. 146, 148, 667 P.2d 453, 455 (1983). Any necessary balancing, whatever its outcome, could also properly be performed in a summary judgment posture. See Hoopa Valley Tribe v. Nevins, 881 F.2d 657 (9th Cir.1989) (affirming trial court’s grant of summary judgment and decision that California’s tax on tribe’s timber revenues was preempted), cert. denied, 494 U.S. 1055, 110 S.Ct. 1523, 108 L.Ed.2d 763 (1990). Thus, the district court properly decided the case in a summary judgment proceeding. Id.
The precise issue before this court is whether a sale of services, in contrast to a sale of goods, to an Indian enterprise on an Indian reservation is within the scope of the Indian trader statutes. At this point, we consider it beneficial to quote the Department’s own words in framing the issue before us:
There is no question that the Indian trader statutes preempt state taxes on covered activities. The issue here is' whether coverage of those statutes historically and currently extends beyond the sale of goods to include services. The issue is not whether those statutes should cover services. That is a legislative decision. The question is whether Congress in enacting those statutes in 1834 and 1876 intended them to apply to anything but the sale of goods. A secondary issue is whether the Secretary of the Interior, by promulgating a particular regulation — 25 C.F.R. 140.5 — has interpreted the Indian trader statutes to permit regulation of the sale of services to Indians or> reservations by licensed Indian traders, and, if so, whether such interpretation is permissible.
Specifically, the Department’s argument is that, because the Indian trader statutes do not specifically include the word “services,” the word “trade,” as used in the Indian trader statutes, refers only to trade in goods and not to trade in services. We disagree.
The United States Supreme Court has stated that the Indian trader statutes must be given “ ‘a sweep as broad as [their] language, * * * and interpreted] * * * in light of the intent of the Congress that enacted them.’ ” Central Mach. Co., 448 U.S. at 166, 100 S.Ct. at 2596. In that case, the court held that imposition of the state tax was preempted by the Indian trader statutes even though the seller was not a licensed Indian trader and did not have a permanent place of business on the reservation. Id. at 165, 100 S.Ct. at 2596.
Given the purpose of the Indian trader statutes — “to prevent ‘fraud and imposition’ upon [the Indians],” Central Mach. Co., 448 U.S. at 163, 100 S.Ct. at 2594-95— there is little reason to distinguish between the sale of goods and the sale of services. The potential for fraud and imposition in the sale of services is perhaps even greater than the potential provided by the sale of goods. Is it, however, too great a stretch in the meaning of “trade” to include the purchase and sale of services? The interpretation of the word “trade” as used in the Indian trader statutes is apparently a matter of first impression in reported court decisions. But cf. United States ex rel. Keith v. Sioux Nation Shopping Ctr., 488 F.Supp. 496, 499 (D.S.D.) (district court notes that it has previously granted motions for summary judgment on the basis that 25 U.S.C. Section 264 “applies only to those who deal in goods.”), aff'd, 634 F.2d 401 (8th Cir.1980).
The Department, noting that the origins of the Indian trader statutes lie in the early years of our nation, contends that the words “trade” and “trader” have consistently been used in these statutes to refer only to trade in goods. It points to provisions in these acts that require the forfeiture of goods by traders who violate the statute and provisions that permit the federal government to regulate the prices of goods. The Department contends that in the late 1700s and 1800s, when these statutes were enacted, “[t]he economy was based on trade in goods, not the provision of services, as it is today. The era of the service economy was not to come for over a century.”
In further support of its position, the Department cites a portion of the definition contained in Webster’s Third New Interna*650tional Dictionary (1976) (Webster’s), which defines the noun “trade” as “the business of buying and selling or bartering commodities: exchange of goods for convenience or profit” and defines the verb “trade” as “to give in exchange for another commodity.” Id. at 2421. To establish the meaning at the time of enactment of the early Indian trader statutes, the Department observes that the dictionary cites usage of the verb “trade” by James Fenimore Cooper as follows: “[T]he white men who penetrated to the * * * wilds were always ready * * * to trade rifles and watches.”
We are not convinced. Raytheon and Laguna cite a study by the National Bureau of Economic Research showing that services constituted 32% of the gross national product as long ago as 1839. National Bureau of Economic Research, Output, Employment and Productivity in the United States after 1800 (New York, 1966). Other dictionary definitions include “the business one practices or the work in which one engages regularly: one’s calling: gainful employment: OCCUPATION,” and references are made to a variety of occupations, including doctors, carpenters, and writers, all of whom provide services, as well as to merchants. Webster’s, supra, at 2421. More importantly, the word, “trade” had a broader meaning than simply transactions in goods when used in contexts similar to the Indian trader statutes.
Courts that have considered the meaning of the word “trade” have regularly rejected the narrow definition proposed by the state. In The Nymph, 18 F.Cas. 506 (C.C.D.Me.1834) (No. 10,388), Supreme Court Justice Story, sitting as a circuit justice, interpreting the word “trade” as used in the coasting and fishery act of 1793, rejected a definition limiting “trade” to “traffic in goods, or buying and selling in commerce or exchange” in favor of a broader definition. He wrote:
[T]he word “trade” is often, and indeed generally, used in a broader sense, as equivalent to occupation, employment, or business, whether manual or mercantile * * * Thus, we constantly speak of the art, mystery, or trade of a housewright, a shipwright, a tailor, a blacksmith, and a shoe-maker, though some of these may be, and sometimes are, carried on without buying or selling goods.
The Supreme Court, in United States v. Hutto, 256 U.S. 524, 41 S.Ct. 541, 65 L.Ed. 1073 (1921), and Ewert v. Bluejacket, 259 U.S. 129, 42 S.Ct. 442, 66 L.Ed. 858 (1922), considered a statute forbidding persons involved in Indian affairs from having “any interest or concern in any trade with the Indians.” Ewert, 259 U.S. at 135, 42 S.Ct. at 443. In Hutto, the charges included involving Indians in loan transactions, as well as transactions involving the sale of land, automobiles, and other commodities. The Supreme Court did not distinguish among the charges, indicating that it believed the prohibition against trade with the Indians was broad enough to include the service of lending money to the Indians. In Ewert, the Supreme Court rejected the argument that:
the “trade with the Indians” in which persons employed in Indian affairs were prohibited by the section from engaging must be confined to trade with [Indians] when conducted as a business or occupation — to merchants or dealers supplying the Indians with the necessities or conveniences of life. Having regard to the purpose of the statute [to protect the Indians], we think that no such narrow interpretation can be given to the section.
Ewert, 259 U.S. at 137, 42 S.Ct. at 444.
Similarly, in Jordan v. Tashiro, 278 U.S. 123, 49 S.Ct. 47, 73 L.Ed. 214 (1928), the Supreme Court considered the definition of the word “trade” as used in a 1911 treaty that granted Japanese citizens the right to “carry on trade” within the United States. California contended that this provision did not allow a Japanese citizen to operate a hospital as a business enterprise and argued that “trade” was limited to the purchase, sale, or exchange of goods and commodities. The Supreme Court rejected this argument, stating:
While in a narrow and restricted sense the terms “commerce,” or “commercial,” and “trade” may be limited to the pur*651chase and sale or exchange of goods and commodities, they may connote, as well, other occupations and other recognized forms of business enterprise which do not necessarily involve trading in merchandise. And although commerce includes traffic in this narrower sense, for more than a century it has been judicially recognized that in a broad sense it embraces every phase of commercial and business activity and intercourse.
Id. at 127-28, 49 S.Ct. at 48 (citations omitted). The Court noted that “trade” had been interpreted as including carrying on a business as a pawnbroker. Id. at 128, 49 S.Ct. at 48-49. But see Clarke v. Deckebach, 274 U.S. 392, 395, 47 S.Ct. 630, 631, 71 L.Ed. 1115 (1927) (treaty protection of “merchants and traders” did not protect owner of poolroom). In Atlantic Cleaners & Dyers, Inc. v. United States, 286 U.S. 427, 52 S.Ct. 607, 76 L.Ed. 1204 (1932), the Supreme Court interpreted the word “trade,” as used in the Sherman Act, as including the provision of cleaning and dyeing services.
Further support for a broad definition of “trade” can be found in the opinions in Worcester v. Georgia, 31 U.S. (6 Pet.) 515, 8 L.Ed. 483 (1832). Samuel Worcester had been convicted of violating a Georgia law prohibiting persons from residing within the Cherokee Nation without a state permit. Worcester’s crime was living with the Indians as a missionary, by authority of the President of the United States. He challenged his conviction on the grounds that the Georgia law violated the United States Constitution, treaties entered into between the United States and the Cherokee Indians, and the Indian trader act of 1802. Although Justice Marshall did not refer to any specific provision of the 1802 law that was violated by the Georgia statute, he did write that the Georgia statutes were in “hostility with the acts of congress for regulating this intercourse [with the Indians].” Id. 31 U.S. (6 Pet.) at 562. In a concurring opinion, Justice McLean specifically stated that the Georgia laws were repugnant to the 1802 act. Id. at 578. Although Justice McLean may have been relying on Section 3 of the 1802 act (which required persons entering Indian Country to obtain a passport from a state governor, military officer, or other person designated by the President), it appears that he relied on Section 7, which prohibited any person to reside with the Indians as a trader without a license from the federal government. The opinion focuses on Worcester’s residence with the Indians and the regulation of trade by the 1802 statute, not the mere passage of Worcester into Indian Country. For example, Justice McLean wrote:
The restrictions imposed by the law of 1802, come strictly within the power to regulate trade; not as an incident, but as a part of the principal power. It is the same power, and is conferred in the same words, that has often been exercised in regulating trade with foreign countries * * * *
In the regulation of commerce with the Indians, congress have exercised a more limited power than has been exercised in reference to foreign countries. The law acts upon our own citizens, and not upon the Indians, the same as the laws referred to act upon our own citizens in their foreign commercial intercourse.
Id. at 592. At the least, the opinions in Worcester establish that the purpose of the 1802 act was to control in the broadest sense all intercourse with the Indians in their territory. Such a purpose suggests that the words “trade” and “trader” in the statute were used in their broadest senses.
The language of the 1834 Indian trader statute further supports such a construction. Section 5 reads:
And be it further enacted, That no license to trade with the Indians shall be granted to any persons except citizens of the United States: Provided, That the President shall be authorized to allow the employment of foreign boatmen and interpreters, under such regulations as he may prescribe.
The language implies that boatmen and interpreters — who perform services — needed a “license to trade” under the act. Even if the proviso in this section was designed primarily to permit foreign boatmen and interpreters to be employed by those who *652traded in goods with the Indians, the fact that every employee of a trader (even though not employed to engage personally in trading goods with the Indians) needed a trader’s license again shows, at the least, that “trade” was to be given a broad interpretation.
Additionally, the United States Interior Department has interpreted the Indian trader statutes in a manner that supports the district court’s interpretation of “trade.” The Secretary of the Interior’s interpretation of a statute within his regulatory purview is entitled to deference by the courts. Northern Cheyenne Tribe v. Hollowbreast, 425 U.S. 649, 96 S.Ct. 1793, 48 L.Ed.2d 274 (1976); see also Public Serv. Co. v. New Mexico Pub. Serv. Comm’n, 106 N.M. 622, 625, 747 P.2d 917, 920 (1987) (stating that “courts should accord deference to the interpretation given to a statute by the agency to which it is addressed.”).
The regulations promulgated by the Interior Department to implement the Indian trader statutes are 25 C.F.R. Parts 140 and 141. Part 140, entitled “Licensed Indian Traders,” defines “[tjrading” as “buying, selling, bartering, renting, leasing, permitting and any other transaction involving the acquisition of property or services. ” 25 C.F.R. § 140.5(a)(6) (emphasis added). The Department argues that this definition does not reflect the Interior Department’s interpretation of the Indian trader statutes because it is contained in a section titled “Bureau of Indian Affairs employees not to contract or trade with Indians except in certain cases.” 25 C.F.R. § 140.5. Thus, the Department contends, definitions contained in the section must only refer to that section, and not to the following sections that specifically pertain to Indian traders. We disagree.
The regulation states that the definitions apply to “this part.” 25 C.F.R. § 140.5(a). In arguing that the definitions contained in Section 140.5(a) are not intended to apply to all of Part 140, the Department asks us to ignore the plain language of the regulation. In any event, even if the definitions in Section 140.5 were intended to apply only to regulations governing BIA employees, there is no reason to believe that a different definition would be appropriate in construing the Indian trader statutes. The restrictions on dealings between Indians and BIA personnel have a common ancestry with the Indian trader statutes. The original restrictions appear in companion legislation to the 1834 Indian trader and intercourse act. These two statutes were “intimately connected” and “parts of a system.” H.R.Rep. No. 474, 23d Cong., 1st Sess. 1 (1834). It is natural to assume that the word “trade” should bear the same meaning in those statutes and their progeny. The 1834 restrictions on trading between government personnel and Indians have long been interpreted as including service transactions. See S.Rep. No. 372, 76th Cong., 1st Sess. (1939).
Furthermore, Part 141, which contains the regulations promulgated by the Interi- or Department regarding business practices on the Navajo, Hopi, and Zuni reservations, similarly demonstrates that federal agency's interpretation of the Indian trader statutes as allowing the agency to regulate services provided on the reservations. Part 141 is intended “to prescribe rules for the regulation of reservation businesses for the protection of Indian consumers on the Navajo, Hopi and Zuni Reservations as required by 25 U.S.C. 261-64.” 25 C.F.R. § 141.1. Although the terms “trade” and “trading” are not specifically defined, the scope of the regulations is clearly intended to include businesses that provide services. The regulations prohibit a person from owning or leasing a “reservation business” without a license. 25 C.F.R. § 141.5(a). A “reservation business” is defined to include persons engaged “in the sale or purchase of goods or services or in consumer credit transactions.” 25 C.F.R. § 141.3(1). Clearly, the Interior Department views its authority to issue licenses to “reservation businesses” as deriving from its authority to license “traders.” It follows that the Interior Department views the word “traders” within the meaning of the Indian trader statutes to encompass those dealing in services.
*653These authorities persuade us that the term “trade” as used in the Indian trader statutes should be broadly defined to include trade in services. Like the statute discussed in Ewert, the Indian trader statutes are intended to protect the Indians from fraud. See Central Mach. Co., 448 U.S. at 163, 100 S.Ct. at 2594-95. Additionally, for more than 150 years, the Supreme Court and the federal courts have refused to limit the definition of “trade” to trade in goods. See, e.g., Jordan v. Tashiro; The Nymph. The agency responsible for administering the Indian trader statutes has interpreted the statutes as allowing for the regulation of services. See 25 C.F.R. § 140.5(a)(6). Finally, the Supreme Court has stated that the Indian trader statutes should be broadly construed. Central Mach. Co., 448 U.S. at 167, 100 S.Ct. at 2597.
The Department also relies on Ramah Navajo School Board, Inc. v. Bureau of Revenue, 458 U.S. 832, 102 S.Ct. 3394, 73 L.Ed.2d 1174 (1982), and Rodey, Dickason, Sloan, Akin & Robb, P.A. v. Revenue Division, 107 N.M. 399, 759 P.2d 186 (1988), to argue for a restrictive interpretation of the Indian trader statutes. Once again, we quote verbatim from the Department’s argument contained in its brief:
The issue of taxing services sold to tribal entities on reservations has, indeed, been litigated, but without ever referring to the Indian trader statutes. In Ramah, New Mexico imposed its gross receipts tax on the services of constructing a building on the Navajo reservation. The Supreme Court ultimately ruled that a federal statute concerning Indian education preempted the state tax. No mention was ever made of the Indian trader statutes. Why not? Warren Trading Post and Central Machinery had already definitively held that any activity which came within the scope of the Indian trader statute could not be subjected to state tax. If the Indian trader statutes indeed extended to services, the decision in Ramah would have been unanimous and one sentence long: “The case is controlled by Warren Trading Post and Central Machinery.” Instead, the Court completely ignored the Indian trader statutes and decided the case on the basis of other statutes. In [Rodey ], the issue was the provision of legal services to the Navajo tribe, performed partially on and partially off the reservation. Again, in arguing the issue of preemption to this court, Rodey placed no reliance on the Indian trader statutes as the federal law that preempted the provision of services to tribes. The only relevant federal statutes discussed by the courts in Rodey were those dealing with the employment of claims counsel.
In posing its argument, we believe that the Department has provided the basis for our determination that its reliance on Ramah and Rodey is misplaced. In neither case did any of the parties rely on the Indian trader statutes. Instead, other federal legislation was at issue and was ultimately dispositive of the issues raised by the parties. The failure of these decisions specifically to address the issue of whether the sale of services was within the scope of the Indian trader statutes is, in our judgment, a weak basis for determining that services are thus excluded. In addition, Rodey specifically restricted itself to services provided off of the reservation; therefore, the Indian trader statutes would have no application.
We recognize that previous opinions of the Tenth Circuit Court of Appeals and New Mexico courts have held that New Mexico’s gross receipts tax may be imposed on a non-Indian performing services on Indian lands. See Mescalero Apache Tribe v. O’Cheskey, 625 F.2d 967 (10th Cir.1980); Tiffany Constr. Co. v. Bureau of Revenue, 96 N.M. 296, 629 P.2d 1225 (1981); G.M. Shupe, Inc. v. Bureau of Revenue, 89 N.M. 265, 550 P.2d 277 (Ct.App.1976). However, for the reasons that follow, we do not consider these particular opinions controlling.
G.M. Shupe rejected the applicability of the Indian trader statutes solely on the ground that the taxpayer was not an Indian trader. G.M. Shupe, 89 N.M. at 268, 550 P.2d at 280. The court did not explain, however, why the contractor was not an *654Indian trader. One obvious reason was that the taxpayer’s contract was with the federal Bureau of Reclamation, not an Indian entity. G.M. Shupe does not stand for the proposition that services are not covered by the Indian trader statutes.
Tiffany may suggest that services rendered to a tribe on tribal land by a non-' Indian contractor are subject to New Mexico’s gross receipts tax. See Alexander v. Delgado, 84 N.M. 717, 507 P.2d 778 (1973) (court of appeals must follow supreme court precedent). However, this court may consider whether supreme court precedent is applicable. Walker v. Maruffi, 105 N.M. 763, 737 P.2d 544 (Ct.App.1987). We hold that Tiffany is inapplicable because that opinion did not discuss whether the Indian trader statutes apply to service providers on the reservations.
As for Mescalero Apache Tribe, although the opinion on rehearing in that case might be read as stating that the Indian trader statutes do not govern trade in services, that opinion certainly offers no reasoning in support of that conclusion.3 We therefore see no reason to defer to that opinion on the same issue before us.
For these reasons, we determine that G.M. Shupe, Tiffany, and Mescalero Apache Tribe do not compel reversal of the district court’s decision in this case. Cf. Walker, 105 N.M. at 769, 737 P.2d at 550 (where our supreme court did not address issue, precedent not controlling on this court).
CONCLUSION
We determine that the word “trade” as used in the Indian trader statutes includes trade in services. Therefore, as conceded by the State, the preemption analysis applied in Warren Trading Post and Central Machinery applies to the transaction between Laguna and Raytheon in this appeal. Consequently, We hold that the Department’s taxation of services rendered to the tribal enterprise on the reservation was preempted by federal law. We therefore affirm the district court's decision.
IT IS SO ORDERED.
HARTZ, J., concurs.
BLACK, J., dissents.