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325, 199 N.E.2d 652, 655-56 (1964).
Plaintiffs cite two sets of “changed circumstances” that they argue justify vacating the 2002 order: the decision by
the class representatives in Price to voluntarily dismiss their parallel unjust enrichment claim, and the Supreme
Court’s 2008 decision in Altria, which they contend constitutes a subsequent change in the law that undermines the
1. The requirements for claim preclusion
Philip Morris argues that there is no reason to vacate the earlier dismissal order because the plaintiffs’ claim regard-
ing Marlboro Lights is precluded by the Illinois Supreme Court’s decision in Price. A final judgment on the merits
of an action precludes the parties to that action and their privies from litigating claims that were or could have been
actions between the same parties or their privies on the same cause of action.” Rein v. David A. Noyes & Co., 172
Ill.2d 325, 334, 216 Ill.Dec. 642, 665 N.E.2d 1199, 1204 (1996). Three requirements must be satisfied for claim
preclusion to apply: a final judgment on the merits rendered by a court of competent jurisdiction; identity of the par-
ties or their privies; and identity of the causes of action. Downing v. Chicago Transit Auth., 162 Ill.2d 70, 73-74, 204
Ill.Dec. 755, 642 N.E.2d 456, 458 (1994). If these requirements are met, the judgment in the earlier suit bars “not
tiff class in Price. Plaintiffs contend, however, that there is no identity of the causes of action because class mem-
bers in this case raise a different claim from the one that was decided in Price and seek a different remedy.
[5] Illinois law applies the “transactional test” to determine whether there is an identity to the cause of action at is–
sue. Under this test, “separate claims will be considered the same cause of action … if they arise from a single group
good conscience. E.g., HPI Health Care Servs., Inc. v. Mt. Vernon Hosp., Inc., 131 Ill.2d 145, 160, 137 Ill.Dec. 19,
545 N.E.2d 672 (1989). Plaintiffs allege that Philip Morris promoted the sale of its light cigarettes by encouraging
smokers to believe they were healthier than regular cigarettes, when they are in fact just as dangerous. Plaintiffs con-
tend that Philip Morris was unjustly enriched as a result of these claims about light cigarettes and that allowing Phil–
ip Morris to keep the money it made selling light cigarettes would violate principles of justice, equity, and good con-