OPINION
MATTHEWS, Justice.
As originally presented by the parties, this case called upon us to construe the 1988 amendment to AS 23.30.220(a). This statute prescribes the wage base on which an injured worker’s disability benefits are calculated. In the course of considering each party’s contentions on this issue, we became aware of potential constitutional problems with the wage base calculation scheme found in AS 23.30.220(a). Specifically, we recognized that the formula contained in section 220(a) would result in substantially different compensation rates for workers who appeared to be in important respects similarly situated. These differences raised questions under the due process and equal protection clauses of the Alaska Constitution. Sua sponte, we ordered the parties to file supplemental memo-randa addressing these questions. We now hold that the AS 23.30.220(a) formula violates the equal protection clause of the Alaska Constitution.
Under AS 23.30.180 and .185, temporary and permanent total disability benefits are calculated by taking eighty percent of an injured employee’s “spendable weekly wages.” Spendable weekly wages are, in turn, defined in AS 23.30.220(a) as the employee’s gross weekly earnings minus payroll tax deductions.1 Gross weekly earnings are calculated by totalling the employee’s earnings for the past two calendar years and dividing the sum by 100. Until 1988, the Alaska Workers’ Compensation Board (Board) was required to determine whether the wage base that resulted from the use of this or earlier similar mechanical formulas would fairly reflect the future earnings lost by an injured employee.2 If the formula did not produce a fair result viewed from the perspective of both the employee3 and the [924]*924employer,4 the Board was permitted to determine gross weekly earnings by an alternative method based on the nature of the employee’s job and his work history.
This alternative method was the subject of considerable litigation.5 In 1988 the legislature eliminated the Board’s discretion to use the alternative method in circumstances where the mechanical approach would lead to unfair results. Under the 1988 amendment, the Board may not make an alternative wage calculation unless “the employee was absent from the labor market for 18 months or more of the two calendar years preceding the injury. ...” AS 23.30.220(a)(2). As a result, the gross weekly earnings for purposes of calculating benefits for any employee present in the labor market for six or more months in the previous two calendar years will be determined by the mechanical formula provided in AS 23.30.220(a)(1). Because this formula divides the employee’s total gross wages over the two year period by 100 regardless of how many weeks the employee actually worked during this period, the employee’s actual wage earning capacity during periods of employment is reduced in proportion to any period in which the employee was unemployed for any reason.6 The resulting benefits therefore may only be randomly related to the injured worker’s actual loss. This formula applies regardless of any discrepancy, no matter how large, between the result of the formula and the actual wages lost by the employee during the period of his or her disability.
I. FACTS AND PROCEEDINGS
Warren Gilmore suffered serious burn injuries on September 17, 1989, while employed by Klukwan Forest Products, Inc. (Klukwan). Klukwan’s workers’ compensation insurance carrier, Alaska Timber Insurance Exchange (Alaska Timber), paid Gilmore temporary total disability benefits of $110 per week until he was released to return to work on March 1, 1990. Gilmore started work for Klukwan on June 12, 1989 and was earning average spendable weekly wages of approximately $850. However, for the calendar years 1987 and 1988 he worked for a total of only thirty-nine weeks. He claims that for twenty-two of the thirty-nine weeks he was in vocational training programs learning to be a motorcycle mechanic. He contends that he should have been considered “absent from the labor market” within the meaning of section .220(a)(2) for these twenty-two weeks. If he is correct, he would be entitled to an alternative wage computation, for he would have been “absent from [925]*925the labor market” for at least eighteen months during the two years in question.
The Board rejected Gilmore’s contention, ruling:
AS 23.30.220(a) mandates that the employee’s compensation rate must be calculated based on his 1987 and 1988 earnings unless he can demonstrate that he was “absent from the labor market” for at least 18 months during those two years. The 1988 legislation containing the present provision of AS 23.30.220(a)(2), Senate bill 322, carried an “intent” section which required that the benefits system be quick, efficient, fair, and predictable. The employee provides a novel argument to expand the meaning of “absent from the labor market,” but any definition involving vocational intent, career experience, true earning potential, and so on, invariably leads into a gray area of disputed fact, a fertile ground for litigation, delay, and waste. The clearest rule and the rule least subject to dispute is to interpret “absent from the labor force” to mean simply “unemployed,” and we consistently interpret the statute that way. See, e.g., Langley v. Alaska Commercial Investments, AWCB No. 89-0167 (July 5, 1989).
On appeal the superior court affirmed. The court stated:
It was the intent of the legislature to establish a fair and predictable test for establishing eligibility for compensation rate adjustments pursuant to AS 23.30.220(a)(2). The Board’s definition of “absent from the labor market” as “unemployed” accomplishes this purpose ..., while also furthering the legislature’s desire to narrow the group of employees allowed a compensation rate adjustment.
Gilmore appealed to this court. In the course of considering the arguments of the parties with respect to the meaning of the phrase “absent from the labor market,” we took notice of potential equal protection and due process problems with AS 23.30.220(a). As these constitutional issues are “critical to a proper and just decision” in this case, we sua sponte ordered the parties to brief the question of the constitutionality of AS 23.30.220(a).7 We also requested the parties, in briefing this question, to consider two examples in which the loss of future earnings for the injured workers would be the same:8
Example A: Two workers work side-by-side for eleven and one half months in 1992, ending December 15th, as well as for the last seven months of 1991, beginning June 1st. During this period each worker performs the same work and earns the same wage. Worker # 1, however, did not work the first five months of 1991 or at all in 1990 because he was injured. Worker #2, on the other hand, worked all of both 1991 and 1990. On December 15, 1992, both workers suffered- the same injury in an on-the-job accident. Under AS 23.30.220(a)(2) the wage base for worker # 1 will be only ¾ of that of worker # 2.
Example B: Same facts as Example A except that there is a third worker doing the same work at the same wage who [926]*926suffers the same injury on December 15, 1992.
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OPINION
MATTHEWS, Justice.
As originally presented by the parties, this case called upon us to construe the 1988 amendment to AS 23.30.220(a). This statute prescribes the wage base on which an injured worker’s disability benefits are calculated. In the course of considering each party’s contentions on this issue, we became aware of potential constitutional problems with the wage base calculation scheme found in AS 23.30.220(a). Specifically, we recognized that the formula contained in section 220(a) would result in substantially different compensation rates for workers who appeared to be in important respects similarly situated. These differences raised questions under the due process and equal protection clauses of the Alaska Constitution. Sua sponte, we ordered the parties to file supplemental memo-randa addressing these questions. We now hold that the AS 23.30.220(a) formula violates the equal protection clause of the Alaska Constitution.
Under AS 23.30.180 and .185, temporary and permanent total disability benefits are calculated by taking eighty percent of an injured employee’s “spendable weekly wages.” Spendable weekly wages are, in turn, defined in AS 23.30.220(a) as the employee’s gross weekly earnings minus payroll tax deductions.1 Gross weekly earnings are calculated by totalling the employee’s earnings for the past two calendar years and dividing the sum by 100. Until 1988, the Alaska Workers’ Compensation Board (Board) was required to determine whether the wage base that resulted from the use of this or earlier similar mechanical formulas would fairly reflect the future earnings lost by an injured employee.2 If the formula did not produce a fair result viewed from the perspective of both the employee3 and the [924]*924employer,4 the Board was permitted to determine gross weekly earnings by an alternative method based on the nature of the employee’s job and his work history.
This alternative method was the subject of considerable litigation.5 In 1988 the legislature eliminated the Board’s discretion to use the alternative method in circumstances where the mechanical approach would lead to unfair results. Under the 1988 amendment, the Board may not make an alternative wage calculation unless “the employee was absent from the labor market for 18 months or more of the two calendar years preceding the injury. ...” AS 23.30.220(a)(2). As a result, the gross weekly earnings for purposes of calculating benefits for any employee present in the labor market for six or more months in the previous two calendar years will be determined by the mechanical formula provided in AS 23.30.220(a)(1). Because this formula divides the employee’s total gross wages over the two year period by 100 regardless of how many weeks the employee actually worked during this period, the employee’s actual wage earning capacity during periods of employment is reduced in proportion to any period in which the employee was unemployed for any reason.6 The resulting benefits therefore may only be randomly related to the injured worker’s actual loss. This formula applies regardless of any discrepancy, no matter how large, between the result of the formula and the actual wages lost by the employee during the period of his or her disability.
I. FACTS AND PROCEEDINGS
Warren Gilmore suffered serious burn injuries on September 17, 1989, while employed by Klukwan Forest Products, Inc. (Klukwan). Klukwan’s workers’ compensation insurance carrier, Alaska Timber Insurance Exchange (Alaska Timber), paid Gilmore temporary total disability benefits of $110 per week until he was released to return to work on March 1, 1990. Gilmore started work for Klukwan on June 12, 1989 and was earning average spendable weekly wages of approximately $850. However, for the calendar years 1987 and 1988 he worked for a total of only thirty-nine weeks. He claims that for twenty-two of the thirty-nine weeks he was in vocational training programs learning to be a motorcycle mechanic. He contends that he should have been considered “absent from the labor market” within the meaning of section .220(a)(2) for these twenty-two weeks. If he is correct, he would be entitled to an alternative wage computation, for he would have been “absent from [925]*925the labor market” for at least eighteen months during the two years in question.
The Board rejected Gilmore’s contention, ruling:
AS 23.30.220(a) mandates that the employee’s compensation rate must be calculated based on his 1987 and 1988 earnings unless he can demonstrate that he was “absent from the labor market” for at least 18 months during those two years. The 1988 legislation containing the present provision of AS 23.30.220(a)(2), Senate bill 322, carried an “intent” section which required that the benefits system be quick, efficient, fair, and predictable. The employee provides a novel argument to expand the meaning of “absent from the labor market,” but any definition involving vocational intent, career experience, true earning potential, and so on, invariably leads into a gray area of disputed fact, a fertile ground for litigation, delay, and waste. The clearest rule and the rule least subject to dispute is to interpret “absent from the labor force” to mean simply “unemployed,” and we consistently interpret the statute that way. See, e.g., Langley v. Alaska Commercial Investments, AWCB No. 89-0167 (July 5, 1989).
On appeal the superior court affirmed. The court stated:
It was the intent of the legislature to establish a fair and predictable test for establishing eligibility for compensation rate adjustments pursuant to AS 23.30.220(a)(2). The Board’s definition of “absent from the labor market” as “unemployed” accomplishes this purpose ..., while also furthering the legislature’s desire to narrow the group of employees allowed a compensation rate adjustment.
Gilmore appealed to this court. In the course of considering the arguments of the parties with respect to the meaning of the phrase “absent from the labor market,” we took notice of potential equal protection and due process problems with AS 23.30.220(a). As these constitutional issues are “critical to a proper and just decision” in this case, we sua sponte ordered the parties to brief the question of the constitutionality of AS 23.30.220(a).7 We also requested the parties, in briefing this question, to consider two examples in which the loss of future earnings for the injured workers would be the same:8
Example A: Two workers work side-by-side for eleven and one half months in 1992, ending December 15th, as well as for the last seven months of 1991, beginning June 1st. During this period each worker performs the same work and earns the same wage. Worker # 1, however, did not work the first five months of 1991 or at all in 1990 because he was injured. Worker #2, on the other hand, worked all of both 1991 and 1990. On December 15, 1992, both workers suffered- the same injury in an on-the-job accident. Under AS 23.30.220(a)(2) the wage base for worker # 1 will be only ¾ of that of worker # 2.
Example B: Same facts as Example A except that there is a third worker doing the same work at the same wage who [926]*926suffers the same injury on December 15, 1992. Worker #3, however, did not work during the first seven months of 1991 or at all in 1990 because he was injured. Worker #3 would be entitled to an alternative calculation under AS 23.30.220(a) and may be eligible for compensation benefits based on his current wage which would approximate the wage base of worker #2 and be nearly 3.4 times higher than that of worker # 1 (who worked two months longer than worker #3 during 1991).
Briefing is now complete,9 and the issue is ripe for decision.
II. DISCUSSION
Article I, section 1 of the Alaska Constitution provides in part that “all persons are equal and entitled to equal rights, opportunities, and protection under the law.” This clause may be more protective of individual rights than the federal equal protection clause. State v. Cosio, 858 P.2d 621, 629 (Alaska 1993). As our examples illustrate, the current statutory scheme clearly classifies injured employees based on differences in their prior work history. These classifications will often result in substantially different disability benefits for similarly situated employees. The question therefore is whether this unequal treatment is permissible under the Alaska Constitution.10
We have adopted a “sliding scale” test for analyzing equal protection questions under the Alaska Constitution. State v. Erickson, 574 P.2d 1, 11-12 (Alaska 1978). This test involves a three-step analysis:
First, it must be determined at the outset what weight should be afforded the ... interest impaired by the challenged enactment. The nature of this interest is the most important variable in fixing the appropriate level of review.... Depending on the primacy of the interest involved, the state will have a greater or lesser burden in justifying its legislation.
Second, an examination must be undertaken of the purposes served by the challenged statute. Depending on the level of review determined, the state may be required to show only that its objectives were legitimate, at the low end of the continuum, or, at the high end of the scale, that the legislation was motivated by a compelling state interest.
Third, an evaluation of the state’s interest in the particular means employed to further its goals must be undertaken.... At the low end of the sliding scale, we have held that a substantial relationship between means and ends is constitutionally adequate. At the higher end of the scale, the fit between means and ends must be much closer. If the purpose can be accomplished by a less restrictive alternative, the classification will be invalidated.
Alaska Pac. Assurance Co. v. Brown, 687 P.2d 264, 269-70 (Alaska 1984).
A. Interest Impaired
The interest impaired by the classifications at issue is the injured employee’s interest in compensation benefits which reflect his actual losses. In Brown, we implied that the employee’s “right to receive the full measure of workers’ compensation benefits which he would receive but for the classification” at issue was not an interest deserving of elevated' scrutiny. Id. at 270-71. We noted that there is no constitutional mandate that benefits bear a particular relationship to the worker’s salary at the time of injury.11 [927]*927Id. at 270. As the employee’s right to travel was also implicated by the classification at issue in Broion, we did not determine the exact weight to be afforded an injured employee’s interest in particular benefit levels. Id. at 271. An interest in workers’ compensation benefits is, however, similar to an interest in unemployment compensation benefits or other economic interests. We have consistently held that such economic interests are only “entitled to review at the low end of the scale.” Sonneman v. Knight, 790 P.2d 702, 705 (Alaska 1990); see also Cosio, 858 P.2d at 629; Coghill v. Coghill, 836 P.2d 921, 929 (Alaska 1992); State v. Anthony, 810 P.2d 155, 158, reh’g granted, 816 P.2d 1377 (Alaska 1991); Herrick’s Aero-Auto-Aqua Repair Serv. v. State, Dep’t of Transp., 754 P.2d 1111, 1114 (Alaska 1988). Therefore, section 220(a) will pass constitutional muster if the classifications it creates bear a fair and substantial relationship to the purposes of the Workers’ Compensation Act (Act).
B. Purpose of the Act
In analyzing equal protection challenges to a provision of the Workers’ Compensation Act, we must examine the purpose behind the provision in light of the purpose of the entire Act. Taylor v. Southeast-Harrison W. Corp., 694 P.2d 1160, 1162 (Alaska 1985). In adopting the 1988 amendments, the legislature clearly stated the purpose behind the Act:
It is the intent of the legislature that AS 23.30 be interpreted so as to ensure the quick, efficient, fair, and predictable delivery of indemnity and medical benefits to injured workers at a reasonable cost to the employers who are subject to the provisions of AS 23.30.
Ch. 79, § 1, SLA (1988). These are legitimate purposes. The overall purpose of AS 23.30.220(a) and the other sections of the Act used to calculate an injured worker’s indemnity benefits is “to formulate a fair approximation of a claimant’s probable future earning capacity during the period in which compensation benefits are to be paid.”12 Johnson, 681 P.2d at 907. This “fair approximation” is an essential component of the basic compromise underlying the Workers’ Compensation Act — the worker’s sacrifice of common law claims against the employer in return for adequate compensation without the delay and expenses inherent in civil litigation. The 1988 amendments to AS 23.30.220(a) attempt to further the Act’s overall purpose by decreasing the amount of litigation over the determination of an employee’s “spendable weekly wage.” House Judiciary Hearing on SB 322, April 25, 1988, Tr. 13, 18-19.
C. Relationship of Means to Ends
At the lower end of our sliding scale, the means adopted by the legislature [928]*928must be substantially related to the ends sought to be achieved. Brown, 687 P.2d at 269-70. A perfect fit between the legislative classification and the governmental objective is not required. Anthony, 810 P.2d at 169. We nevertheless conclude that no substantial relationship exists between calculating a worker’s weekly wage by dividing the worker’s earnings over the last two calendar years by 100 regardless of whether the number reached reflects the worker’s actual losses and the goals of fairly approximating a worker’s probable future earning capacity and achieving a “quick, efficient, fair, and predictable delivery of indemnity and medical benefits.”
The benefit levels among injured workers based on section 220(a) bear no more than a coincidental relationship to the goal of compensating injured workers based on their actual losses. In any of the many situations in which a worker’s past wage and time of employment do not accurately reflect the circumstances existing at the time of the injury, the formula will misrepresent the losses.13 The means chosen for determining an injured worker’s gross weekly wage therefore do not bear a substantial relationship to that goal.
Klukwan and the Amici concede that the current version of AS 23.30.220(a) will lead to unfair or unfavorable results in some instances. They and the Board argue, however, that the statute is nevertheless constitutional because it is substantially related to the legislative interest in reducing litigation and in furthering quick, predictable results. We recognize that rigid application of the mechanical formula set out in AS 23.30.220(a)(1) probably leads to quick and predictable results. This efficiency is gained, however, at the sacrifice of fairness in result. The purpose of the Act, as expressed by the legislature, is to provide a “quick, efficient, fair, and predictable delivery of indemnity and medical benefits.” The facts of the present case amply demonstrate the potential unfairness of a rigid application of the mechanical formula.14 Under the section 220(a)(1) formula as applied by the Board, Gilmore received only the statutory minimum amount of compensation, despite his earning over seven and one-half times more per week at the time of injury.
Efficiency in this area does not require unfairness. A quick, efficient, and predictable scheme for determining a worker’s gross weekly earnings could be formulated without denying workers like Gilmore benefits commensurate with their actual losses. Many jurisdictions avoid the need for an alternative open-ended determination of actual future earning capacity by focusing narrowly on wages at the time of injury and converting, by formula or formulas, the worker’s rate of pay into a weekly wage. See, e.g., D.C.Code Ann. § 36-311 (1993); Iowa Code Ann. § 85.36 (1984); Kan.Stat.Ann. § 44-511(b) (1993); Ky.Rev.Stat.Ann. § 342.140 (1993); Minn.Stat. § 176.011(18) (1993); Mo.Rev. Stat. § 287.250 (1993); Neb.Rev.Stat. § 48-126 (1990); N.J.Rev.Stat. § 34:15-37 (1988); N.M.Stat.Ann. § 52-1-20 (1978); 77 Pa.Cons. Stat.Ann. § 582 (1992).15 Such a formulaic [929]*929system can be quick, efficient, predictable, and fair. Review of the worker’s compensation statutes of the other forty-nine states reveals that Alaska is the only state which bases compensation exclusively on the average wage earned over a more than one year period without providing an alternate approach if the formula reaches an unfair result. It is also the only state which includes significant periods of unemployment in calculating the worker’s average wage without requiring a preliminary finding that the worker was employed in a seasonal occupation at the time of injury.16
The gross weekly wage determination method of AS 23.30.220(a) creates large differences in compensation between similarly situated injured workers, bears no relationship to the goal of accurately calculating an injured employee’s lost wages for purposes of determining his or her compensation, is unfair to workers whose past history does not accurately reflect their future earning capacity, and is unnecessary to achieve quickness, efficiency, or predictability. Therefore, the formula expressed in AS 23.30.220(a) is not substantially related to the purposes of the Act. It cannot survive scrutiny on even the lowest end of our sliding scale and is therefore an unconstitutional infringement on the equal protection clause of the Alaska Constitution. Art. I, § l.17
[930]*930III. CONCLUSION
We reverse the Board’s determination of Gilmore’s weekly compensation rate as it was based on an unconstitutional statutory requirement. On remand, the Board should recalculate Gilmore’s gross weekly earnings by using the alternative method specified in section 220(a).18
REVERSED AND REMANDED.
COMPTON, J., concurs.
BURKE, J., not participating.