Berdon, J.
The sole issue in this case is whether General Statutes § 53-301,1 which prohibits a party engaged in the business of selling motor vehicles from selling them on Sunday, violates the state constitution. Because we conclude that § 53-301 violates substantive due process under article first, § 8, of the state constitution2 we need not reach the plaintiffs’ other state constitutional claims.3
[314]*314The plaintiffs are nine motor vehicle dealerships located in Danbury.4 They instituted this suit in order to obtain a declaratory judgment5 that § 53-301 is unconstitutional, and to enjoin the defendant commissioner of motor vehicles from enforcing the statute.6 Subsequent to the filing of the suit, the trial court granted the Connecticut Automotive Trades Association, Inc. (CATA), and Tufano Motorcar, Inc., permission to join the suit as defendants. Thereafter, the plaintiffs filed an amended complaint that sought only a declaratory judgment. The parties filed a joint stipulation of facts and petitioned the trial court to reserve three questions concerning the constitutionality of § 53-3017 for the [315]*315advice of this court.8 The trial court granted the petition for reservation and approved the joint stipulation of facts.
The following stipulated facts are relevant. For most of the year, the plaintiff dealerships are open for business Monday through Thursday from 8:30 a.m. to 9 p.m., and Friday and Saturday from 8:30 a.m. to 6 p.m.9 Currently, Saturday is the busiest and most profitable day for the plaintiffs. The plaintiffs would open for business on Sunday if they were permitted to do so. Section 53-301 has caused the plaintiffs to suffer economic loss in the form of lost potential profits from Sunday sales of new and used automobiles and trucks.10
Section 53-301 is one of the last vestiges of Connecticut’s Sunday closing laws, some of which were first [316]*316codified in 1650. Caldor’s, Inc. v. Bedding Barn, Inc., 177 Conn. 304, 306, 417 A.2d 343 (1979) (Caldor’s). In Caldor’s, we struck down the general Sunday closing law, General Statutes § 53-302a, as violative of substantive due process under our state constitution. The closing law at issue in this case, § 53-301, was originally adopted as § 1 of No. 614 of the 1957 Public Acts. Section 2 of this act contained the predecessor of § 53-302a. The plaintiffs claim that the substantive due process analysis developed in Caldor’s for challenging Sunday closing laws under our state constitution requires us to strike down § 53-301. We agree.
We recognize that a party challenging the constitutionality of a statute must prove its unconstitutionality beyond a reasonable doubt. Connecticut Building Wrecking Co. v. Carothers, 218 Conn. 580, 590, 590 A.2d 447 (1991); Bartholomew v. Schweizer, 217 Conn. 671, 675, 587 A.2d 1014 (1991); Zapata v. Burns, 207 Conn. 496, 508, 542 A.2d 700 (1988). While the courts may declare a statute to be unconstitutional, our power to do this should “be exercised with caution, and in no doubtful case.” State v. Brennan’s Liquors, 25 Conn. 278, 289 (1856). Every presumption is to be given in favor of the constitutionality of the statute. State v. Floyd, 217 Conn. 73, 79, 584 A.2d 1157 (1991); Bottom v. Westport, 209 Conn. 652, 657, 553 A.2d 576 (1989).
The plaintiffs rely solely on state constitutional grounds to invalidate § 53-301. It is beyond dispute that we are not bound by federal precedents in interpreting our own state constitutional provisions. “[F]ederal decisional law is not a lid on the protections guaranteed under our state constitution.” Doe v. Maher, 40 Conn. Sup. 394, 419, 515 A.2d 134 (1986). As we stated in State v. Geisler, 222 Conn. 672, 684, 610 A.2d 1225 (1992), “federal constitutional and statutory law establishes a minimum national standard for the exercise of [317]*317individual rights and does not inhibit state governments from affording higher levels of protection . . . .” (Internal quotation marks omitted.)
Nevertheless, we are not precluded from using federal precedents in crafting a framework for state constitutional analysis and in interpreting state constitutional provisions. “Just as it is wrong to assume that state constitutions are mere mirror images of the Federal Constitution, so it is wrong to assume that independent state constitutions share no principles with their federal counterpart. The interstices of open-ended state constitutions remain to be filled, and many of them will best be filled by adopting into state law, on a case-by-case basis, persuasive constitutional doctrines from federal law and from sister states.” E. Peters, “State Constitutional Law: Federalism in the Common Law Tradition,” 84 Mich. L. Rev. 583, 592-93 (1986); see also Daly v. DelPonte, 225 Conn. 499, 512-13, 624 A.2d 876 (1993) (“[i]n the interpretation of our state constitution, we have often consulted the case law under the federal constitution . . .”); State v. Lamme, 216 Conn. 172, 184, 579 A.2d 484 (1990) (“[t]he adoption of federal constitutional precedents that appropriately illuminate open textured provisions in our own organic document in no way compromises our obligation independently to construe the provisions of our state constitution”). Furthermore, it is clear that our adoption, for purposes of state constitutional analysis, of an analytical framework used under the federal constitution does not preclude us from concluding that a statute that would be valid under the federal constitution is nevertheless invalid under our state constitution. See, e.g., State v. Miller, 227 Conn. 363, 377-87, 630 A.2d 1315 (1993).
The due process clause of article first, § 8, like the similar provision in the federal fourteenth amendment, provides for varying levels of judicial review to deter[318]*318mine whether a state statute or regulation passes constitutional muster in terms of substantive due process. See Daly v. DelPonte, supra, 225 Conn. 513 (“We have held, in accordance with the federal frame of analysis, that state action concerning social and economic regulation will survive an equal protection challenge if it satisfies a rational basis test. ... If, however, state action invidiously discriminates against a suspect class or affects a fundamental right, the action passes constitutional muster under the state constitution only if it survives strict scrutiny.” [citation omitted]); Doe v. Maher, supra, 40 Conn. Sup. 441-43 (recognizing that varying levels of judicial review are used depending on the nature of the right the statute or regulation impinges upon).
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Berdon, J.
The sole issue in this case is whether General Statutes § 53-301,1 which prohibits a party engaged in the business of selling motor vehicles from selling them on Sunday, violates the state constitution. Because we conclude that § 53-301 violates substantive due process under article first, § 8, of the state constitution2 we need not reach the plaintiffs’ other state constitutional claims.3
[314]*314The plaintiffs are nine motor vehicle dealerships located in Danbury.4 They instituted this suit in order to obtain a declaratory judgment5 that § 53-301 is unconstitutional, and to enjoin the defendant commissioner of motor vehicles from enforcing the statute.6 Subsequent to the filing of the suit, the trial court granted the Connecticut Automotive Trades Association, Inc. (CATA), and Tufano Motorcar, Inc., permission to join the suit as defendants. Thereafter, the plaintiffs filed an amended complaint that sought only a declaratory judgment. The parties filed a joint stipulation of facts and petitioned the trial court to reserve three questions concerning the constitutionality of § 53-3017 for the [315]*315advice of this court.8 The trial court granted the petition for reservation and approved the joint stipulation of facts.
The following stipulated facts are relevant. For most of the year, the plaintiff dealerships are open for business Monday through Thursday from 8:30 a.m. to 9 p.m., and Friday and Saturday from 8:30 a.m. to 6 p.m.9 Currently, Saturday is the busiest and most profitable day for the plaintiffs. The plaintiffs would open for business on Sunday if they were permitted to do so. Section 53-301 has caused the plaintiffs to suffer economic loss in the form of lost potential profits from Sunday sales of new and used automobiles and trucks.10
Section 53-301 is one of the last vestiges of Connecticut’s Sunday closing laws, some of which were first [316]*316codified in 1650. Caldor’s, Inc. v. Bedding Barn, Inc., 177 Conn. 304, 306, 417 A.2d 343 (1979) (Caldor’s). In Caldor’s, we struck down the general Sunday closing law, General Statutes § 53-302a, as violative of substantive due process under our state constitution. The closing law at issue in this case, § 53-301, was originally adopted as § 1 of No. 614 of the 1957 Public Acts. Section 2 of this act contained the predecessor of § 53-302a. The plaintiffs claim that the substantive due process analysis developed in Caldor’s for challenging Sunday closing laws under our state constitution requires us to strike down § 53-301. We agree.
We recognize that a party challenging the constitutionality of a statute must prove its unconstitutionality beyond a reasonable doubt. Connecticut Building Wrecking Co. v. Carothers, 218 Conn. 580, 590, 590 A.2d 447 (1991); Bartholomew v. Schweizer, 217 Conn. 671, 675, 587 A.2d 1014 (1991); Zapata v. Burns, 207 Conn. 496, 508, 542 A.2d 700 (1988). While the courts may declare a statute to be unconstitutional, our power to do this should “be exercised with caution, and in no doubtful case.” State v. Brennan’s Liquors, 25 Conn. 278, 289 (1856). Every presumption is to be given in favor of the constitutionality of the statute. State v. Floyd, 217 Conn. 73, 79, 584 A.2d 1157 (1991); Bottom v. Westport, 209 Conn. 652, 657, 553 A.2d 576 (1989).
The plaintiffs rely solely on state constitutional grounds to invalidate § 53-301. It is beyond dispute that we are not bound by federal precedents in interpreting our own state constitutional provisions. “[F]ederal decisional law is not a lid on the protections guaranteed under our state constitution.” Doe v. Maher, 40 Conn. Sup. 394, 419, 515 A.2d 134 (1986). As we stated in State v. Geisler, 222 Conn. 672, 684, 610 A.2d 1225 (1992), “federal constitutional and statutory law establishes a minimum national standard for the exercise of [317]*317individual rights and does not inhibit state governments from affording higher levels of protection . . . .” (Internal quotation marks omitted.)
Nevertheless, we are not precluded from using federal precedents in crafting a framework for state constitutional analysis and in interpreting state constitutional provisions. “Just as it is wrong to assume that state constitutions are mere mirror images of the Federal Constitution, so it is wrong to assume that independent state constitutions share no principles with their federal counterpart. The interstices of open-ended state constitutions remain to be filled, and many of them will best be filled by adopting into state law, on a case-by-case basis, persuasive constitutional doctrines from federal law and from sister states.” E. Peters, “State Constitutional Law: Federalism in the Common Law Tradition,” 84 Mich. L. Rev. 583, 592-93 (1986); see also Daly v. DelPonte, 225 Conn. 499, 512-13, 624 A.2d 876 (1993) (“[i]n the interpretation of our state constitution, we have often consulted the case law under the federal constitution . . .”); State v. Lamme, 216 Conn. 172, 184, 579 A.2d 484 (1990) (“[t]he adoption of federal constitutional precedents that appropriately illuminate open textured provisions in our own organic document in no way compromises our obligation independently to construe the provisions of our state constitution”). Furthermore, it is clear that our adoption, for purposes of state constitutional analysis, of an analytical framework used under the federal constitution does not preclude us from concluding that a statute that would be valid under the federal constitution is nevertheless invalid under our state constitution. See, e.g., State v. Miller, 227 Conn. 363, 377-87, 630 A.2d 1315 (1993).
The due process clause of article first, § 8, like the similar provision in the federal fourteenth amendment, provides for varying levels of judicial review to deter[318]*318mine whether a state statute or regulation passes constitutional muster in terms of substantive due process. See Daly v. DelPonte, supra, 225 Conn. 513 (“We have held, in accordance with the federal frame of analysis, that state action concerning social and economic regulation will survive an equal protection challenge if it satisfies a rational basis test. ... If, however, state action invidiously discriminates against a suspect class or affects a fundamental right, the action passes constitutional muster under the state constitution only if it survives strict scrutiny.” [citation omitted]); Doe v. Maher, supra, 40 Conn. Sup. 441-43 (recognizing that varying levels of judicial review are used depending on the nature of the right the statute or regulation impinges upon).
We agree with the defendants that § 53-301 neither impairs a fundamental constitutional right nor targets a suspect class, either of which would require that this court apply strict scrutiny to determine whether the statute passes muster under our state constitution. State Management Assn. of Connecticut, Inc. v. O’Neill, 204 Conn. 746, 750, 529 A.2d 1276 (1987). Rather, because § 53-301 merely regulates a commercial activity—the sale of motor vehicles on Sunday—it must be reviewed “in accordance with the rules that normally govern constitutional challenges of economic or social welfare legislation, by ascertaining whether the legislature has acted arbitrarily or irrationally.” Connecticut Education Assn., Inc. v. Tirozzi, 210 Conn. 286, 299, 554 A.2d 1065 (1989). Although great constitutional deference is afforded to the legislature, our state due process clause mandates that the legislature must limit the exercise of its police powers to preserving the public peace, health and morals. In re Application of Clark, 65 Conn. 17, 40, 31 A. 522 (1894). “The court’s function in examining the constitutional aspect of police legislation is to decide whether the purpose of the legis[319]*319lation is a legitimate one and whether the particular enactment is designed to accomplish that purpose in a fair and reasonable way.” Pierce v. Albanese, 144 Conn. 241, 249, 129 A.2d 606, appeal dismissed, 355 U.S. 15, 78 S. Ct. 36,2 L. Ed. 2d 21 (1957). Even under this less exacting test of constitutionality, an economic regulation will survive a substantive due process test only if it is both rational and related to a legitimate state purpose. Campbell v. Board of Education, 193 Conn. 93, 105, 475 A.2d 289 (1984); Caldor’s, supra, 177 Conn. 315. “If an enactment meets this test, it satisfies the constitutional requirements of due process . . . . Schwartz v. Kelly, 140 Conn. 176, 179, 99 A.2d 89 [1953]; Carroll v. Schwartz, 127 Conn. 126, 129, 14 A.2d 754 [1940].” Pierce v. Albanese, supra, 249.
As the first step in our state constitutional analysis, we must ascertain the legislative purpose behind § 53-301 in order to evaluate whether the statute is rationally related to that purpose. As noted above, § 53-301 is one of the Sunday closing laws and was originally adopted in the same legislation; Public Acts 1957, No. 614; as the general closing law struck down in Caldor’s. In Caldor’s, supra, 177 Conn. 310, we determined that the purpose of these closing laws was to create a common day of rest. “Although in origin such laws were intimately related to the establishment of religious principles, over time their acknowledged purpose and justification have shifted to secular grounds.” Id., 306. In an attempt to avoid the state constitutional principles developed in Caldor’s for analyzing closing law legislation, the defendants claim that we should speculate concerning other conceivable purposes for the statute.11 We disagree.
[320]*320As early as the turn of the century, when religious observance was still an acknowledged purpose for the [321]*321closing laws, this court made clear that such laws were also designed to secure to private citizens the quiet enjoyment of Sunday as a day of rest. Wetherell v. Hollister, 73 Conn. 622, 625, 48 A. 826 (1901). We have reiterated this secular purpose in more modern times. See Caldor’s, supra, 177 Conn. 306; State v. Shuster, 145 Conn. 554, 557-58, 145 A.2d 196 (1958); State v. Hurliman, 143 Conn. 502, 507, 123 A.2d 767 (1956). In view of these judicial pronouncements, we presume that the legislature has “knowledge of this longstanding construction which this court has given to the objective and purpose of legislation in this field.” Klapproth v. Turner, 156 Conn. 276, 279, 240 A.2d 886 (1968); see also Cappellino v. Cheshire, 226 Conn. 569, 576, 628 A.2d 595 (1993) (“ ‘the legislature is presumed to be aware of the judicial construction placed upon its enactments’ ”). We also presume that the legislature is aware of the effect that its action or inaction will have on an existing statute, and to intend the effect that its action or inaction produces. All Brand Importers, Inc. v. Dept. of Liquor Control, 213 Conn. 184, 197, 567 A.2d 1156 (1989).
The legislature has not done anything to indicate that § 53-301 has a separate purpose from the other Sunday closing laws, or that the purpose of these laws is not a common day of rest. We must therefore reaffirm the long-standing construction that this court has given to the purpose of the closing laws—that is, “to further a common day of rest.” Caldor’s, supra, 177 Conn. 325. Because an act with such a purpose “cannot be justified by other unspecified governmental, economic, or social reasons”; id.; we will not speculate as to other conceivable purposes.
The courts have recognized that providing a common day of rest for citizens is a legitimate governmental interest. McGowan v. Maryland, 366 U.S. 420, 445, 81 S. Ct. 1101, 6 L. Ed. 2d 393 (1961); Caldor’s, supra, [322]*322177 Conn. 306. That does not, however, end our constitutional inquiry, because we must determine whether the prohibition of the sale of motor vehicles on Sunday bears a reasonable relationship to that purpose. In Caldor’s, we recognized the difficulty in making this inquiry. “Because any statement of the rational connection test is necessarily general and open-ended, controversy tends, as in this case, to concern not the test itself but rather its application.” Caldor’s, supra, 315. Accordingly, in performing our substantive due process analysis under the state constitution, we borrow from the teachings of procedural due process in examining the “totality of circumstances that bear on the rationality” of the statute. Id., 316.
In this case, as in Caldor’s, there are three aspects of the Sunday closing law at issue that warrant special emphasis in examining the totality of circumstances. First, as the parties concede, § 53-301 is a penal statute. Motor vehicle dealers who violate the statute are subject both to fines and to possible suspension of their dealer’s licenses. As a penal statute, § 53-301 must be strictly construed. Id., 318.
Second, § 53-301 regulates conduct that would be entirely legitimate in the absence of the statute. We noted in Caldor’s, supra, 177 Conn. 317, that “[t]o be constitutionally valid, legislation policing the operation of a legitimate business must serve some phase of the public health, safety, convenience and welfare in a reasonable and impartial way.” (Internal quotation marks omitted.) See also Mott’s Super Markets, Inc. v. Frassinelli, 148 Conn. 481, 487, 172 A.2d 381 (1961) (invalidating, under the due process clause of the state constitution, a provision of the Unfair Sales Practices Act that provided that proof that a retailer had sold or offered to sell goods below cost would be prima facie evidence of an intent to destroy competition); United Interchange, Inc. v. Spellacy, 144 Conn. 647, 654, 136 [323]*323A.2d 801 (1957) (invalidating, under the due process and equal protection provisions of the state constitution, a statute requiring individuals who solicit advertisements for real estate periodicals to obtain real estate licenses). While “the legislature has a broad discretion” in fashioning economic legislation, the courts must limit this discretion ‘ ‘at that point where the regulatory measures either fail to serve the public good or serve it in a despotic way.” (Internal quotation marks omitted.) Caldor’s, supra, 317; see also Mott’s Super Markets, Inc. v. Frassinelli, supra, 487; United Interchange, Inc. v. Spellacy, supra, 654. “[Regulations imposed on a lawful business cannot exceed what is reasonably necessary to accomplish their purpose,” especially where the regulation imposes penal sanctions for conduct that does not carry “any antisocial implications whatsoever.” Caldor’s, supra, 318; see also Mott’s Super Markets, Inc. v. Frassinelli, supra, 487.
Third, as we recognized in Caldor’s, supra, 177 Conn. 319, difficulties inhere in legislation designed to provide a common day of rest. As a Sunday closing law, § 53-301 “furthers an objective that is difficult to effectuate with clarity and precision.” Id., 316. In Caldor’s, the fact that the legislature had provided numerous exemptions from the general closing law led us to conclude that the statute failed to effectuate, in a rational manner, the objective of providing a common day of rest. Id., 324-25. The difficulty in discerning a rational connection between the statute and its objective is even more pronounced in this case, because the legislature has failed to reenact a general Sunday closing law. As a result, almost all commercial enterprises other than motor vehicle dealerships are permitted to open for business on Sunday. Indeed, it appears that, since Caldor’s, the legislature has completely abandoned the difficult task of providing a common day of rest for the people of Connecticut.
[324]*324In view of the totality of circumstances set forth above, we conclude that the plaintiffs have proven beyond a reasonable doubt that § 53-301 is arbitrary and therefore violates article first, § 8, of our state constitution. The current statutory scheme fails to provide a common day of rest for Connecticut’s people, and we cannot discern any legitimate reason for providing a common day of rest for one narrow class of employees,12 or, in regard to consumers, from one specific type of purchase.13 Furthermore, § 53-301 may actually harm the public by making it inconvenient and difficult for people to comparison shop for motor vehicles at different dealerships. For example, the defendants concede that many couples prefer to shop together for a car, but only have time to do so on Sundays and in the evenings. Because § 53-301 prevents them from [325]*325shopping on Sundays, they are limited to evenings and probably to the dealerships closest to their homes or places of business. Such anticompetitive effects harm all consumers.
The second reserved question—that is, does § 53-301 violate the plaintiffs’ rights to due process of law guaranteed by article first, § 8, of the Connecticut constitution?—is answered in the affirmative. The case is remanded to the trial court for further proceedings consistent with this opinion.
No costs will be taxed in this court to any party.
In this opinion the other justices concurred.