CLIFFORD, J.
[¶ 1] John McKinnon appeals from a summary judgment in favor of Honeywell International, Inc. entered in the Superior Court (York County, Fritzsche, J.) on his putative class action complaint alleging that Honeywell violated the Maine Unfair Trade Practices Act (UTPA), 5 M.R.S. §§ 205-A to 214 (2008), and Maine’s antitrust statute governing monopolies and profiteering, 10 M.R.S. §§ 1101-1110 (2008), by preventing competition for, and misrepresenting trademark status on, its circular thermostats. Among other contentions, McKinnon challenges the court’s conclusion that the applicable statute of limitations bars his claim and that his claim fails to state a cognizable injury. Because the portion of McKinnon’s claim based on the purchase of thermostats in Maine in 1986 is barred by the statute of limitations, and the remainder of his claim, based on his single purchase of a thermostat in New Hampshire, fails to demonstrate sufficient injury or damage to support his unfair trade practices and antitrust claims, we affirm the judgment.
I. BACKGROUND
[¶ 2] McKinnon’s complaint, as amended, alleges that Honeywell “engaged in illegal, unfair, deceptive and unlawfully monopolistic business practices in connection with the sale of its circular thermostats in Maine.” Specifically, McKinnon alleges that Honeywell prevented competition in the circular thermostat market by misrepresenting that it had a proper trademark on such thermostats and threatening rival thermostat manufacturers with litigation, and that this anti-competitive activity resulted in higher prices, causing consumers in Maine, such as McKinnon, to pay inflated amounts for the thermostats.
[¶ 3] In June of 2006, Honeywell moved for a summary judgment on grounds that McKinnon’s claim was barred by the statute of limitations, and that McKinnon had failed to provide the court with sufficient evidence of a cognizable injury. Viewing the facts presented in the parties’ M.R. Civ. P. 56(h) statements in the light most favorable to McKinnon, as the nonmoving party, see Arrow Fastener Co. v. Wrabacon, Inc., 2007 ME 34, ¶ 15, 917 A.2d 123, 126, the summary judgment record contains the following evidence.
[¶ 4] McKinnon purchased a total of four circular Honeywell thermostats, none directly from Honeywell. The first three thermostats, McKinnon believes, were bought in 1986, most likely from Garrity Lumber in York. McKinnon alleges that he purchased a fourth thermostat sometime around 2001 from Home Depot in Portsmouth, New Hampshire. Home Depot stores in New Hampshire advertise in Maine. McKinnon does not remember precisely how much he paid for any of the four thermostats, and is able to give only estimates. His best estimate is that he paid between fifteen and twenty dollars for each of the three thermostats purchased in Maine in 1986. McKinnon’s recollection of the New Hampshire purchase is vague as well, but his best estimate is that he paid approximately twenty-six to twenty-seven dollars, “give or take $5,” for the thermostat purchased there. He does not recall, however, whether any of the thermostats were purchased on sale, were subject to discounts, or benefited from any rebates. [423] He has no receipts or sales slips for any of his purchases. At the times he purchased the thermostats, he believed he was paying fair market prices for them.
[¶ 5] McKinnon learned about Honeywell’s alleged antitrust activities around August or September of 2004, following a separate trademark suit brought in federal court. He filed this action in the Superior Court on November 12, 2004.1 McKinnon alleges that, as a result of Honeywell’s activities, he and other members of the putative class paid artificially inflated prices for the thermostats. In his statement of material facts filed in opposition to Honeywell’s motion for a summary judgment, McKinnon substantially relies on the facts of the federal case as set out in the opinion of the United States District Court for the Southern District of Indiana, Eco Mfg. LLC v. Honeywell Int’l, Inc., 295 F.Supp.2d 854 (S.D.Ind.2003), aff'd, Eco Mfg. LLC v. Honeywell Int’l, Inc., 357 F.3d 649 (7th Cir.2003). Those facts are as follows:2 Honeywell originally obtained a patent on the round thermostat in 1946 based on the utility of the circular shape; that patent expired in 1963. Meanwhile, in 1956, Honeywell also obtained a design patent for the appearance of the round thermostat. In 1968, when the design patent was approaching its expiration, Honeywell filed an application to secure a trademark for the circular shape, but the application was ultimately denied because the circular shape was deemed functional and therefore not subject to trademark protection.
[¶ 6] Even though its trademark application was denied, Honeywell threatened other companies attempting to manufacture and sell circular thermostats with litigation, claiming that to do so would violate the trademark rights owned by Honeywell. Honeywell eventually purchased one of the competing companies and discontinued that company’s manufacture of the circular thermostat. In 1986, Honeywell filed another application with the Patent and Trademark Office for a trademark, in which it misrepresented that there were no other competitors seeking to use a circular design and that it had not entered into any settlement agreements to prevent them from doing so. Honeywell was granted a trademark by the Patent and Trademark Office in 1988.
[¶ 7] Another company, Eco Manufacturing, planned to manufacture a circular thermostat, and filed the federal action in the United States District Court for the Southern District of Indiana, seeking a declaration that its circular thermostat would not infringe on Honeywell’s trademark. Honeywell sought a preliminary injunction to prevent Eco from manufacturing that product. The court declined to issue a preliminary injunction to prevent Eco from manufacturing its circular thermostat based on its finding that, during the period in which Honeywell’s circular thermostat was not protected by either a patent or a trademark, Honeywell may have engaged in misleading acts to suppress competition for such thermostats.3 Eco Mfg., 295 F.Supp.2d at 886-87.
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CLIFFORD, J.
[¶ 1] John McKinnon appeals from a summary judgment in favor of Honeywell International, Inc. entered in the Superior Court (York County, Fritzsche, J.) on his putative class action complaint alleging that Honeywell violated the Maine Unfair Trade Practices Act (UTPA), 5 M.R.S. §§ 205-A to 214 (2008), and Maine’s antitrust statute governing monopolies and profiteering, 10 M.R.S. §§ 1101-1110 (2008), by preventing competition for, and misrepresenting trademark status on, its circular thermostats. Among other contentions, McKinnon challenges the court’s conclusion that the applicable statute of limitations bars his claim and that his claim fails to state a cognizable injury. Because the portion of McKinnon’s claim based on the purchase of thermostats in Maine in 1986 is barred by the statute of limitations, and the remainder of his claim, based on his single purchase of a thermostat in New Hampshire, fails to demonstrate sufficient injury or damage to support his unfair trade practices and antitrust claims, we affirm the judgment.
I. BACKGROUND
[¶ 2] McKinnon’s complaint, as amended, alleges that Honeywell “engaged in illegal, unfair, deceptive and unlawfully monopolistic business practices in connection with the sale of its circular thermostats in Maine.” Specifically, McKinnon alleges that Honeywell prevented competition in the circular thermostat market by misrepresenting that it had a proper trademark on such thermostats and threatening rival thermostat manufacturers with litigation, and that this anti-competitive activity resulted in higher prices, causing consumers in Maine, such as McKinnon, to pay inflated amounts for the thermostats.
[¶ 3] In June of 2006, Honeywell moved for a summary judgment on grounds that McKinnon’s claim was barred by the statute of limitations, and that McKinnon had failed to provide the court with sufficient evidence of a cognizable injury. Viewing the facts presented in the parties’ M.R. Civ. P. 56(h) statements in the light most favorable to McKinnon, as the nonmoving party, see Arrow Fastener Co. v. Wrabacon, Inc., 2007 ME 34, ¶ 15, 917 A.2d 123, 126, the summary judgment record contains the following evidence.
[¶ 4] McKinnon purchased a total of four circular Honeywell thermostats, none directly from Honeywell. The first three thermostats, McKinnon believes, were bought in 1986, most likely from Garrity Lumber in York. McKinnon alleges that he purchased a fourth thermostat sometime around 2001 from Home Depot in Portsmouth, New Hampshire. Home Depot stores in New Hampshire advertise in Maine. McKinnon does not remember precisely how much he paid for any of the four thermostats, and is able to give only estimates. His best estimate is that he paid between fifteen and twenty dollars for each of the three thermostats purchased in Maine in 1986. McKinnon’s recollection of the New Hampshire purchase is vague as well, but his best estimate is that he paid approximately twenty-six to twenty-seven dollars, “give or take $5,” for the thermostat purchased there. He does not recall, however, whether any of the thermostats were purchased on sale, were subject to discounts, or benefited from any rebates. [423] He has no receipts or sales slips for any of his purchases. At the times he purchased the thermostats, he believed he was paying fair market prices for them.
[¶ 5] McKinnon learned about Honeywell’s alleged antitrust activities around August or September of 2004, following a separate trademark suit brought in federal court. He filed this action in the Superior Court on November 12, 2004.1 McKinnon alleges that, as a result of Honeywell’s activities, he and other members of the putative class paid artificially inflated prices for the thermostats. In his statement of material facts filed in opposition to Honeywell’s motion for a summary judgment, McKinnon substantially relies on the facts of the federal case as set out in the opinion of the United States District Court for the Southern District of Indiana, Eco Mfg. LLC v. Honeywell Int’l, Inc., 295 F.Supp.2d 854 (S.D.Ind.2003), aff'd, Eco Mfg. LLC v. Honeywell Int’l, Inc., 357 F.3d 649 (7th Cir.2003). Those facts are as follows:2 Honeywell originally obtained a patent on the round thermostat in 1946 based on the utility of the circular shape; that patent expired in 1963. Meanwhile, in 1956, Honeywell also obtained a design patent for the appearance of the round thermostat. In 1968, when the design patent was approaching its expiration, Honeywell filed an application to secure a trademark for the circular shape, but the application was ultimately denied because the circular shape was deemed functional and therefore not subject to trademark protection.
[¶ 6] Even though its trademark application was denied, Honeywell threatened other companies attempting to manufacture and sell circular thermostats with litigation, claiming that to do so would violate the trademark rights owned by Honeywell. Honeywell eventually purchased one of the competing companies and discontinued that company’s manufacture of the circular thermostat. In 1986, Honeywell filed another application with the Patent and Trademark Office for a trademark, in which it misrepresented that there were no other competitors seeking to use a circular design and that it had not entered into any settlement agreements to prevent them from doing so. Honeywell was granted a trademark by the Patent and Trademark Office in 1988.
[¶ 7] Another company, Eco Manufacturing, planned to manufacture a circular thermostat, and filed the federal action in the United States District Court for the Southern District of Indiana, seeking a declaration that its circular thermostat would not infringe on Honeywell’s trademark. Honeywell sought a preliminary injunction to prevent Eco from manufacturing that product. The court declined to issue a preliminary injunction to prevent Eco from manufacturing its circular thermostat based on its finding that, during the period in which Honeywell’s circular thermostat was not protected by either a patent or a trademark, Honeywell may have engaged in misleading acts to suppress competition for such thermostats.3 Eco Mfg., 295 F.Supp.2d at 886-87.
[424] [¶ 8] Following a consolidated hearing on both McKinnon’s motion for class certification, see M.R. Civ. P. 23, and Honeywell’s motion for a summary judgment, the Superior Court entered a summary judgment in favor of Honeywell. The court first concluded that McKinnon’s complaint was barred by the applicable statute of limitations, and that the statute of limitations was not tolled, or extended, by either fraudulent concealment or the continuing violations doctrine. The court further concluded that McKinnon did not and could not establish that he had suffered any economic injury, as is required by 5 M.R.S. § 213(1) and 10 M.R.S. § 1104(1), because he presented insufficient proof that he was, in fact, charged a supra-competitive price. Accordingly, the court entered a summary judgment in favor of Honeywell and dismissed, as moot, McKinnon’s motion for class certification. McKinnon’s subsequent motion for further findings and for reconsideration was dismissed by the court as untimely and, even if considered timely, was denied. McKinnon then filed this appeal.
II. DISCUSSION
[¶ 9] McKinnon contends that the court erred in concluding that his cause of action is time-barred by the statute of limitations. “Whether a claim is barred by the statute of limitations is a question of law, reviewed de novo.” Farnum v. Oral Surgery Assocs., 2007 ME 140, ¶ 7, 933 A.2d 1267, 1270 (quotation marks omitted).
A. Statute of Limitations as to the Maine Purchases
[¶ 10] Because the purchases of three thermostats were made in Maine by a Maine resident, there is no dispute that Maine law, including Maine’s statute of limitations, applies to those purchases. The limitations period in Maine for both of McKinnon’s causes of action — the antitrust claim and the UTPA claim' — is six years: “[a]ll civil actions shall be commenced within 6 years after the cause of action accrues.” 14 M.R.S. § 752 (2008).
[¶ 11] McKinnon’s compliance with Maine’s six-year statute of limitations therefore depends on when his cause of action accrued. In analyzing accrual, we look to both state and federal antitrust law for guidance in the interpretation of the Maine antitrust statute, including the accrual of an antitrust claim. See 5 M.R.S. § 207(1) (“It is the intent of the Legislature that in construing this section the courts will be guided by the interpretations given by the Federal Trade Commission and the Federal Courts to Section 45(a)(1) of the Federal Trade Commission Act ....”); see also Tungate v. MacLeanStevens Studios, Inc., 1998 ME 162, ¶ 9, 714 A.2d 792, 797. We have defined the time of accrual as “the time the plaintiff sustains a judicially cognizable injury.” Chiapetta v. Clark Assocs., 521 A.2d 697, 699 (Me.1987). Similarly, the United States Court of Appeals for the Fourth Circuit has stated:
Accrual of a private antitrust cause of action for purposes of the statute of limitations occurs when defendants commit an act that causes economic harm to a plaintiff. Even when defendants continue to perform overt acts of furtherance of an antitrust conspiracy within the statutory period, plaintiffs’ injuries also must fall within the limitations period in order not to be time-barred.
[425] Pocahontas Supreme Coal Co. v. Bethlehem Steel Corp., 828 F.2d 211, 218 (4th Cir.1987) (citation omitted).
[¶ 12] In accordance with this standard, the injury McKinnon purports to have sustained as to the three Maine purchases occurred in 1986, when McKinnon alleges that he overpaid for the three circular thermostats. Thus, pursuant to the plain language of 14 M.R.S. § 752, the six-year limitations period on McKinnon’s claim commenced in 1986 and expired in 1992. McKinnon did not file his complaint until 2004, however, eighteen years after his purchases and twelve years beyond the expiration of Maine’s statute of limitations.
[¶ 13] McKinnon does not dispute these dates, but contends that Maine’s six-year statute of limitations is tolled pursuant to one or both of two exceptions to the expiration of the limitations period: the continuing violations doctrine and the fraudulent concealment exception.
[¶ 14] The United States Supreme Court has applied the continuing violations doctrine in the context of federal antitrust law, i.e., the Clayton Act, as follows:
Antitrust law provides that, in the case of a continuing violation, say a price fixing conspiracy that brings about a series of unlawfully high priced sales over a period of years, each overt act that is part of the violation and that injures the plaintiff, e.g., each sale to the plaintiff, starts the statutory period running again, regardless of the plaintiffs knowledge of the alleged illegality at much earlier times.
Klehr v. A.O. Smith Corp., 521 U.S. 179, 189, 117 S.Ct. 1984, 138 L.Ed.2d 373 (1997) (quotation marks and emphasis omitted). Although we have discussed the possible applicability of the doctrine in the context of employment discrimination cases, see LePage v. Bath Iron Works Corp., 2006 ME 130, ¶¶ 10-16, 909 A.2d 629, 633-35, we have never adopted the continuing violations doctrine as a means of tolling the statute of limitations, cf. Batchelder v. Realty Resources Hospitality, LLC, 2007 ME 17, ¶¶ 12-25, 914 A.2d 1116, 1121-25 (applying Maine’s procedural requirements to claims filed pursuant to a state statute modeled after a federal statute). We decline to adopt the continuing violations doctrine in this case arising from a 1986 occurrence, and in which the statute of limitations period expired in 1992, nine years prior to McKinnon’s subsequent purchase of a thermostat in New Hampshire. The New Hampshire purchase did not revive the cause of action based on the 1986 purchases in Maine pursuant to the continuing violations doctrine.
[¶ 15] Regardless of when his cause of action initially accrued, McKinnon contends alternatively that the statutory limitations period should be tolled pursuant to 14 M.R.S. § 859 (2008) because this action is based on fraud through Honeywell’s fraudulent concealment of facts. Section 859 provides:
If a person, liable to any action mentioned, fraudulently conceals the cause thereof from the person entitled thereto, or if a fraud is committed which entitles any person to an action, the action may be commenced at any time within 6 years after the person entitled thereto discovers that he has just cause of action, except as provided in section 3580.