Economic legislation: when economic legislation does not employ classifications subject to heightened scrutiny or impinge on fundamental rights, courts generally view constitutional challenges with the skepticism due respect for legislative choices demands. See, e.g., Hodel v. Indiana, 452 U. S. 314, 331–332. And “in taxation, even more than in other fields, legislatures possess the greatest freedom in classification.” Madden v. Kentucky, 309 U. S. 83, 88. Of key importance, when unlawful discrimination infects tax classifications or other legislative prescriptions, the Constitution simply calls for equal treatment. How equality is accomplished—by extension or invalidation of the unequally distributed benefit or burden, or some other measure—is a matter on which the Constitution is silent. See, e.g., Heckler v. Mathews, 465 U. S. 728, 740 (U.S.S.Ct., 01.06.10, Levin v. Commerce Energy, J. Ginsburg).