The Court’s newly announced standard of review, like all such formulations, can merely hope to suggest the direction that a court’s inquiry should taire, and the relative weight to be afforded a constitutional right. But particular words like “reasonable” and “necessary” also are fused with special meaning, for judges have long experience in applying such standards to constitutional contexts. Reasonableness generally has signified the most relaxed regime of judicial inquiry. See,
e. g., Dandridge v.
Williams, 397 U. S. 471, 485 (1970) (“If the classification has some ‘reasonable basis,’ it does not offend the Constitution”). Contrariwise, the element of necessity traditionally has played a key role in the most penetrating mode of constitutional review. See
e. g., Shapiro v.
Thompson, 394 U. S. 618, 634 (1969) (a classification which burdens *55a fundamental constitutional right must be “necessary to promote a
compelling governmental interest”). The Court’s new test, therefore, represents a most unusual hybrid which manages to merge the two polar extremes of judicial intervention, see generally Gunther, Foreword: In Search of Evolving Doctrine on A Changing Court: A Model for a Newer Equal Protection, 86 Harv. L. Rev. 1,8 (1972), into one synthesis. Plainly, courts are apt to face considerable confusion in wielding such a schizophrenic new instrument. And well they might, for until today one would have fairly thought that as a matter of common sense as well as doctrine, state policies that are “necessary to serve an important public purpose,”
ante, at 25,
a fortiori would be “reasonable.” The Court, however, seems to discover new meanings in these terms. “Necessary” appears to comport with some notion of a less restrictive alternative. As applied by the Court in this instance, however, the less restrictive alternative bears no relationship to previous uses of that analytical tool when economic and social matters were involved. Thus, the Court does not actually inquire whether “the government can achieve the purposes of the challenged regulation equally effectively by one or more narrower regulations.” Struve, The Less-Restrictive-Alternative Principle and Economic Due Process, 80 Harv. L. Rev. 1463 (1967). Rather, the Court concludes that an impairment of contract was not “necessary” because the Court apparently is able to hypothesize other means of achieving some or all of the State’s objectives, even though these alternatives have long been deemed as secondary in importance, nn. 7, 8,
supra, or arguably are unconstitutional,
ante, at 30 n. 28. Under this approach, few, if any, Contract Clause cases in history that have deferred to state policymaking have been correctly decided. See
infra, at 59. The “reasonableness” test does no better. No longer does it mean that this Court will defer to the “reasonable judgments” of the authorized policymakers.
Knebel v.
Hein, 429 U. S. 288, 297 (1977). Instead, the Court appears to ask whether changed circumstances took the state legislature by surprise,
ante, at 31-32. Again, I find no basis in this Court’s prior cases for adopting such a constrictive view of that constitutional test. See
infra, at 59-60.