that the district court abused its discretion by following improper procedures in making its determinations, to the extent it made them at all, with respect to commonality and predominance.
2.
In addition, even if we were to deem adequate the district court’s commonality and predominance methodologies, the court’s substantive application of these Rule 23 requirements in this case was unreasonable enough to constitute an abuse of discretion.
Vega, on behalf of the putative class, asserted two claims in his complaint: “unpaid wages” and unjust enrichment. For the complaint to support class certification as to commonality and predominance, there must be common questions of law or fact among the class relating to one or both of these substantive claims, and, in addition, those common questions must predominate such that they “ha[ve] a direct impact on every class member’s effort to establish liability” that is more substantial than the impact of individualized issues in resolving the claim or claims of each class member. Klay, 382 F.3d at 1255 (citation omitted; alteration in original). “Under the Rule 23(a)(2) commonality requirement, a class action must involve issues that are susceptible to class-wide proof.” Murray v. Auslander, 244 F.3d 807, 811 (11th Cir.2001). Even if the court can identify common questions of law or fact, however, “[t]he predominance inquiry ... is ‘far more demanding’ than Rule 23(a)’s commonality requirement.” Rut-stein v. Avis Rent-A-Car Sys., Inc., 211 F.3d 1228, 1233 (11th Cir.2000) (quoting Jackson, 130 F.3d at 1005, which quotes, in turn, Amchem Prods., Inc. v. Windsor, 521 U.S. 591, 623-24, 117 S.Ct. 2231, 2250, 138 L.Ed.2d 689 (1997)).
“Whether an issue predominates can only be determined after considering what value the resolution of the class-wide issue will have in each class member’s underlying cause of action.” Klay, 382 F.3d at 1255 (quoting Rutstein, 211 F.3d at 1234). In practical terms, we have described the test for predominance as follows:
Where, after adjudication of the class-wide issues, plaintiffs must still introduce a great deal of individualized proof or argue a number of individualized legal points to establish most or all of the elements of their individual claims, such claims are not suitable for class certification under Rule 23(b)(3).... [I]f common issues truly predominate over individualized issues in a lawsuit, then the addition or subtraction of any of the plaintiffs to or from the class [should not] have a substantial effect on the substance or quantity of evidence offered. Put simply, if the addition of more plaintiffs to a class requires the presentation of significant amounts of new evidence, that strongly suggests that individual issues (made relevant only through the inclusion of these new class members) are important. If, on the other hand, the addition of more plaintiffs leaves the quantum of evidence introduced by the plaintiffs as a whole relatively undisturbed, then common issues are likely to predominate.
Klay, 382 F.3d at 1255 (quotations omitted).
At the threshold, the parties dispute whether Florida law even recognizes an independent cause of action for “unpaid wages.” T-Mobile argues that Vega asserted the unpaid wages claim exclusively under Fla. Stat. § 448.08, a section of Florida’s labor statutes that provides for the payment of attorneys’ fees and costs to prevailing parties in actions for unpaid wages but that does not, itself, create an