DAY, J.
This is an appeal from a judgment of the circuit court for Milwaukee County, Honorable John E. McCormick. This appeal is before us on certification from the court of appeals pursuant to sec. 809.61, Stats.
In this class action suit, the plaintiffs allege that the defendants, through their participation in the Wisconsin Title Insurance Rate Service Organization (WTIRSO), violated sec. 625.33, Stats.1 and sec. 133.03, Stats.2 by agreeing to fix the prices of title insurance and related services. The question presented is whether the filed rate doctrine3 precludes the plaintiffs' rate-related suit for damages even if the [720]*720allegations are true. We hold that the filed rate doctrine shields the defendants from liability.
The defendants include twelve title insurance companies and several of their employees. Each title insurance company was a member of WTIRSO, a licensed title insurance rating bureau authorized by sec. 625.15, Stats.4 to file joint rates on behalf of its members.
The plaintiff class consists of all persons who, during the period 1971 through at least 1984, purchased title insurance or related services from one or more of the defendants. The plaintiffs allege that the defendants and WTIRSO engaged in a conspiracy to unreasonably restrain trade, causing the plaintiffs to pay substantially higher prices for title insurance and related services than they would have had to pay in the absence of the alleged conspiracy. The plaintiffs seek treble damages under sec. 133.18, Stats.5
The defendants moved to dismiss the complaint on three separate grounds: (1) the filed rate doctrine; (2) the statute of limitation; and (3) an implied exemption from the Wisconsin antitrust laws. Several defendants, [721]*721who were previously defendants in an antitrust suit which was dismissed pursuant to a settlement approved by the federal district court in the Eastern District of Pennsylvania, also moved to dismiss on the basis of res judicata. While the circuit court dismissed some defendants on the basis of res judicata, the circuit court dismissed all defendants on the basis of the filed rate doctrine. The circuit court specifically reserved judgment on the implied exemption and statute of limitation issues.
The plaintiffs appealed and this court accepted certification from the court of appeals. We affirm the decision of the circuit court on the basis of the filed rate doctrine. Thus, we need not discuss any other issue.
The question of whether the filed rate doctrine shields the defendants from liability is a question of law. This court decides questions of law independently and without deference to the reasoning of the lower court. Pulsfus Farms v. Town of Leeds, 149 Wis. 2d 797, 803-804, 440 N.W.2d 329 (1989).
For nearly one hundred years, the United States Supreme Court has held that the filed rate doctrine prohibits a plaintiff from claiming a lower rate than the one filed by a regulated entity with the appropriate regulatory agency because the filed rate alone governs the relationship between the parties. See Texas & Pacific Railway Co. v. Mugg, 202 U.S. 242 (1906); Louisville & Nashville Railroad Co. v. Maxwell, 237 U.S. 94 (1915). The Court reasoned that allowing a state court to award damages based on a hypothetical rate lower than the filed rate would undermine the regulatory scheme because a plaintiff could obtain greater relief from the court than from the regulatory agency. Arkansas Louisiana Gas Co. v. Hall, 453 U.S. 571, 579 [722]*722(1981). The filed rate doctrine "has been extended across the spectrum of regulated utilities." Id. at 577.
The United States Supreme Court first applied the filed rate doctrine to an antitrust claim in Keogh v. Chicago & N.W. Railway Co., 260 U.S. 156, 163 (1922). In Keogh, the plaintiff alleged that the defendants, freight carriers, formed an association to eliminate competition in violation of the federal antitrust laws. Furthermore, the plaintiff alleged that the association set rates higher than it would have if competition had not been quashed. The plaintiff claimed the extent of this difference as damages. The defendants pointed out that every rate complained of had been duly filed and approved by the Interstate Commerce Commission before it was made effective.
The Court held that the filed rate doctrine barred the plaintiffs claim and the regulatory agency provided the plaintiffs sole source of relief. Id. at 162. The Court concluded that the regulatory agency provided the plaintiff a remedy and refused to provide an additional remedy under the antitrust laws. Id. The Court reasoned that the regulatory agency's approval had, in effect, established the lawfulness of the defendants' rates and the legal rights of the parties were measured solely by the filed rate. Id. at 163. The Court explained that an award under the antitrust laws would undermine the regulatory scheme by acting as a rebate available only to the plaintiff. Id. Furthermore, The Court was troubled by the fact that the plaintiff, in addition to providing that the defendant would have maintained a lower rate in the absence of the illegal conspiracy, would have to prove that the regulatory agency would have approved the hypothetical lower rate. Id. at 163-64.
[723]*723Although this case presents the first opportunity for this court to follow the rule announced in Keogh and apply the filed rate doctrine to an antitrust claim, this court has applied the filed rate doctrine in different contexts since 1911. See City of Manitowoc v. Manitowoc & Northern Traction Co., 145 Wis. 13, 129 N.W. 925 (1911); Kilhourn City v. Southern Wisconsin Power Co., 149 Wis. 168, 135 N.W. 499 (1912); Oconto Electric Co. v. Peoples Land & Mfg. Co., 165 Wis. 467, 161 N.W. 789 (1917). This court, in Manitowoc, held that a rate filed with and found reasonable by the railroad commission becomes the lawful rate and supersedes any contractual rate that differs from the filed rate. Manitowoc, 145 Wis. at 30. In Kilhourn City, this court held that parties dealing with public-service corporations must pay the filed rate for the services performed and stated that "[a] 11 subterfuges whereby one consumer is called upon to pay a greater or a lesser rate than that prescribed in the published schedule of charges ... are condemned." Kilhourn City, 149 Wis. at 181. Similarly, in Oconto, this court stated that a rate filed with the railroad commission becomes "presumptively reasonable and enforceable until a different rate is established in place thereof by the railroad commission pursuant to law." Oconto, 165 Wis. at 485.
This court applied the filed rate doctrine in Chicago & N.W. Transportation Co. v. Thoreson Food Products, Inc., 71 Wis.
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DAY, J.
This is an appeal from a judgment of the circuit court for Milwaukee County, Honorable John E. McCormick. This appeal is before us on certification from the court of appeals pursuant to sec. 809.61, Stats.
In this class action suit, the plaintiffs allege that the defendants, through their participation in the Wisconsin Title Insurance Rate Service Organization (WTIRSO), violated sec. 625.33, Stats.1 and sec. 133.03, Stats.2 by agreeing to fix the prices of title insurance and related services. The question presented is whether the filed rate doctrine3 precludes the plaintiffs' rate-related suit for damages even if the [720]*720allegations are true. We hold that the filed rate doctrine shields the defendants from liability.
The defendants include twelve title insurance companies and several of their employees. Each title insurance company was a member of WTIRSO, a licensed title insurance rating bureau authorized by sec. 625.15, Stats.4 to file joint rates on behalf of its members.
The plaintiff class consists of all persons who, during the period 1971 through at least 1984, purchased title insurance or related services from one or more of the defendants. The plaintiffs allege that the defendants and WTIRSO engaged in a conspiracy to unreasonably restrain trade, causing the plaintiffs to pay substantially higher prices for title insurance and related services than they would have had to pay in the absence of the alleged conspiracy. The plaintiffs seek treble damages under sec. 133.18, Stats.5
The defendants moved to dismiss the complaint on three separate grounds: (1) the filed rate doctrine; (2) the statute of limitation; and (3) an implied exemption from the Wisconsin antitrust laws. Several defendants, [721]*721who were previously defendants in an antitrust suit which was dismissed pursuant to a settlement approved by the federal district court in the Eastern District of Pennsylvania, also moved to dismiss on the basis of res judicata. While the circuit court dismissed some defendants on the basis of res judicata, the circuit court dismissed all defendants on the basis of the filed rate doctrine. The circuit court specifically reserved judgment on the implied exemption and statute of limitation issues.
The plaintiffs appealed and this court accepted certification from the court of appeals. We affirm the decision of the circuit court on the basis of the filed rate doctrine. Thus, we need not discuss any other issue.
The question of whether the filed rate doctrine shields the defendants from liability is a question of law. This court decides questions of law independently and without deference to the reasoning of the lower court. Pulsfus Farms v. Town of Leeds, 149 Wis. 2d 797, 803-804, 440 N.W.2d 329 (1989).
For nearly one hundred years, the United States Supreme Court has held that the filed rate doctrine prohibits a plaintiff from claiming a lower rate than the one filed by a regulated entity with the appropriate regulatory agency because the filed rate alone governs the relationship between the parties. See Texas & Pacific Railway Co. v. Mugg, 202 U.S. 242 (1906); Louisville & Nashville Railroad Co. v. Maxwell, 237 U.S. 94 (1915). The Court reasoned that allowing a state court to award damages based on a hypothetical rate lower than the filed rate would undermine the regulatory scheme because a plaintiff could obtain greater relief from the court than from the regulatory agency. Arkansas Louisiana Gas Co. v. Hall, 453 U.S. 571, 579 [722]*722(1981). The filed rate doctrine "has been extended across the spectrum of regulated utilities." Id. at 577.
The United States Supreme Court first applied the filed rate doctrine to an antitrust claim in Keogh v. Chicago & N.W. Railway Co., 260 U.S. 156, 163 (1922). In Keogh, the plaintiff alleged that the defendants, freight carriers, formed an association to eliminate competition in violation of the federal antitrust laws. Furthermore, the plaintiff alleged that the association set rates higher than it would have if competition had not been quashed. The plaintiff claimed the extent of this difference as damages. The defendants pointed out that every rate complained of had been duly filed and approved by the Interstate Commerce Commission before it was made effective.
The Court held that the filed rate doctrine barred the plaintiffs claim and the regulatory agency provided the plaintiffs sole source of relief. Id. at 162. The Court concluded that the regulatory agency provided the plaintiff a remedy and refused to provide an additional remedy under the antitrust laws. Id. The Court reasoned that the regulatory agency's approval had, in effect, established the lawfulness of the defendants' rates and the legal rights of the parties were measured solely by the filed rate. Id. at 163. The Court explained that an award under the antitrust laws would undermine the regulatory scheme by acting as a rebate available only to the plaintiff. Id. Furthermore, The Court was troubled by the fact that the plaintiff, in addition to providing that the defendant would have maintained a lower rate in the absence of the illegal conspiracy, would have to prove that the regulatory agency would have approved the hypothetical lower rate. Id. at 163-64.
[723]*723Although this case presents the first opportunity for this court to follow the rule announced in Keogh and apply the filed rate doctrine to an antitrust claim, this court has applied the filed rate doctrine in different contexts since 1911. See City of Manitowoc v. Manitowoc & Northern Traction Co., 145 Wis. 13, 129 N.W. 925 (1911); Kilhourn City v. Southern Wisconsin Power Co., 149 Wis. 168, 135 N.W. 499 (1912); Oconto Electric Co. v. Peoples Land & Mfg. Co., 165 Wis. 467, 161 N.W. 789 (1917). This court, in Manitowoc, held that a rate filed with and found reasonable by the railroad commission becomes the lawful rate and supersedes any contractual rate that differs from the filed rate. Manitowoc, 145 Wis. at 30. In Kilhourn City, this court held that parties dealing with public-service corporations must pay the filed rate for the services performed and stated that "[a] 11 subterfuges whereby one consumer is called upon to pay a greater or a lesser rate than that prescribed in the published schedule of charges ... are condemned." Kilhourn City, 149 Wis. at 181. Similarly, in Oconto, this court stated that a rate filed with the railroad commission becomes "presumptively reasonable and enforceable until a different rate is established in place thereof by the railroad commission pursuant to law." Oconto, 165 Wis. at 485.
This court applied the filed rate doctrine in Chicago & N.W. Transportation Co. v. Thoreson Food Products, Inc., 71 Wis. 2d 143, 238 N.W.2d 69 (1976). In Thoreson, the plaintiff, a freight carrier, allegedly damaged some of the defendant's freight. After the next shipment, the defendant sent the plaintiff a check for an amount which represented the filed rate minus the claimed damages from the previous shipment. The check bore a notation stating "in settlement of the above account." The plaintiff cashed the check and [724]*724brought suit to collect the full amount of the filed rate. The defendant relied on the doctrine of accord and satisfaction. This court, however, did not allow the defense of accord and satisfaction because the filed rate was binding on both parties and any agreement, implied or express, by the carrier to offset damage claims against freight charges was rendered null and void as a deviation from the filed rate. Id. at 147 — 48.
While this court has applied the filed rate doctrine on numerous occasions, plaintiffs cite no case in which this court refused to apply the doctrine. Additionally, "[w]e have stated many times that the construction of sec. 133.01(1) is controlled by federal decisions under the Sherman Act." State v. Waste Management of Wisconsin, Inc., 81 Wis. 2d 555, 569, 261 N.W.2d 147 (1977). The United States Supreme Court recently examined and expressly reaffirmed the holding in Keogh. Square D Co. v. Niagara Frontier Tariff Bureau, Inc., 476 U.S. 409 (1986). This court's policy of conforming our antitrust decisions to those of the United States Supreme Court, coupled with this court's history of consistently applying the filed rate doctrine, leads us to adopt the reasoning of the United States Supreme Court's decision in Keogh.
The plaintiffs contend that Keogh does not apply to the present case. Section 625.13, Stats, mandates that insurers file a rate with the Commissioner of Insurance within thirty days after the rate becomes effective. The plaintiffs contrast this system with the system in Keogh where rates were filed and approved before use. Relying on this distinction, the plaintiffs claim that Keogh applies only where the regulatory scheme mandates filing and approval before use and does not apply where the rates may be used before filing.
[725]*725We conclude, however, that the distinction between "file before use" and "use before file" schemes does not render Keogh inapplicable to the present case. In Square D, the United States Supreme Court refused to limit Keogh to cases where rates had been investigated and approved before use. Square D, 476 U.S. at 417. Under Keogh, as interpreted by Square D, the existence of a regulatory remedy bars a private rate-related suit for damages under the antitrust laws regardless of whether the regulatory body approved the rates before or after the rates became effective.
Like the regulatory scheme in Keogh, the Wisconsin Insurance Code provides a regulatory remedy which bars a private rate-related suit for damages. In 1969, the Legislature revised the Insurance Code by replacing a system under which rates were not effective until approved with the current system which allows insurers to set rates as long as they file the rates within thirty days. The plaintiffs contend that the goal of this revision was to promote independent competition among the insurers and limit regulation. The Committee Comments accompanying the revision, however, state that "because competition is not perfect, it cannot be relied on completely." 1969 Wis. Laws Ch. 144 at 257. Furthermore, the Legislature warned that "it does not seem advisable to completely abandon all rate regulation. Rates must be filed after they have begun to be used, and the commissioner's power to intervene decisively is clearly preserved." Id. at 255 (emphasis added).
Although the Legislature intended to promote competition among insurers, the 1969 revision did not eviscerate the power of the Insurance Commissioner. For example, sec. 601.41, Stats, grants the Commis[726]*726sioner the broad authority to administer and enforce Chapter 625. Section 625.04, Stats, authorizes the Commissioner to create exemptions. Section 625.16, Stats, allows the Commissioner to establish reasonable minimum standards for loss ratios of medicare supplement policies, medicare replacement policies and long-term care insurance policies. Sections 625.21 and 625.23,6 Stats, grant the Commissioner the power to require that certain rates be filed and approved before they are made effective.
Most importantly, sec. 625.22, Stats, grants the Commissioner the power to disapprove any rate not in accordance with sec. 625.11, Stats. Section 625.11, Stats, states that "[r]ates shall not be excessive, inadequate or unfairly discriminatory, nor shall an insurer charge any rate which if continued will have or tend to have the effect of destroying competition or creating a monopoly." (emphasis added). Read together, secs. 625.22 and 625.11, Stats, provide that the Insurance Commissioner shall disapprove any rate which will destroy competition. Thus, Chapter 625 provides a remedy when an insurer restrains trade in violation of sec. 133.03, Stats.
Under the filed rate doctrine as enunciated in Keogh, the availability of such a regulatory remedy [727]*727bars a private rate-related suit for damages.7 To hold otherwise would undermine the regulatory scheme by allowing courts to award damages based on a rate which was never filed with the Insurance Commissioner. If courts were authorized to determine whether a hypothetical rate would have been approved by the Insurance Commissioner, we would place insurers in a Procrustean bed where one rate must conform to the requirements of both the Insurance Commissioner and a trier of fact. In order to uphold the regulatory scheme enacted by the Legislature, we conclude that the Insurance Commissioner serves as the plaintiffs' sole source of relief.
The Committee Comments to the 1969 revision of the Insurance Code support this conclusion. The Comments expressly state that "[r]ate regulation is not a place for formal, quasi-litigious proceedings. The process is a very technical one better suited to less formal processes .... No one other than the insurer and the commissioner should have a formal place in rate procedures — i.e. should have 'standing.' It is the commissioner's job to protect the public and any remedies against him should not be built into the rate review procedure but should be more general and applicable to any malfeasance or nonfeasance in office." 1969 Wis. Laws Ch. 144 at 262.
We disagree with the plaintiffs' contention that the United States Supreme Court's recent decision in FTC v. Ticor Title Insurance Co., 119 L. Ed. 2d 410 (1992) applies to this case. In Ticor, The Court decided [728]*728whether several title insurers operating in Wisconsin were immune from federal antitrust liability under the state action doctrine. The state action doctrine shields conduct that would otherwise be illegal from antitrust liability if: (1) the challenged restraint is clearly articulated and affirmatively expressed as a state policy; and (2) the state actively supervises the policy. Id. at 421-24. The Court found that the state action doctrine did not apply because the Wisconsin Insurance Commissioner did not actively supervise the rate-making procedure. This determination, however, does not change the fact that the Wisconsin Insurance Code provides the plaintiffs with a remedy for the violations alleged in the present case. As pointed out previously, the Insurance Commissioner, pursuant to secs. 625.11 and 625.22, Stats., must disapprove any rate which restrains trade. Thus, the Ticor decision is not relevant to the present case.
Finally, we acknowledge the plaintiffs' claims that WTIRSO operated in violation of the Insurance Code. These claims, even if true, do not alter our conclusion. The plaintiffs in Square D claimed that the defendants, members of the Niagara Frontier Tariff Bureau, Inc. (NFTB), did not comply with the terms of the bureau agreement and engaged in conduct that either was not or could not be approved by the regulatory agency. Specifically, the plaintiffs alleged that the defendants: (1) used a committee which was not authorized by the NFTB agreement to set rates and inhibit competition; (2) set and controlled NFTB rate levels without complying with the notice, publication, public hearing, and recordkeeping requirements of the NFTB agreement and ICC regulations; (3) planned threats, retaliation, and coercion against NFTB members to inhibit inde[729]*729pendent actions; (4) used pressures, threats, and retaliation to interfere with independent action; and (5) filed tariffs with the ICC. Thus, the plaintiffs in Square D, who alleged violations of the ICC as well as the antitrust laws, are similar to the plaintiffs in the present case who claim violations of the Insurance Code as well as the antitrust laws. Nevertheless, the Court held that the filed rate doctrine shielded the defendants from treble damages liability under the antitrust laws. 476 U.S. at 417. In the case before us, the circuit court likewise properly dismissed the complaint, which seeks treble damages, on the basis of the filed rate doctrine.
By The Court. — The judgment of the circuit court is affirmed.
Justice Steinmetz and Justice Ceci did not participate in this opinion.