Weichert Co. Realtors v. Ryan, 128 N.J. 427, 437-39 (1992) (a real estate agent who was the "procuring cause" of a sale was entitled to the reasonable value of his services rendered under the theory of quantum meruit);see also Conklin v. Kruger, 79 N.J.L. 326, 328 (Sup.Ct. 1910) ("It is well settled that where one performs services for another at his request, but without any agreement or understanding as to wages or remuneration, the law implies a promise on the part of the party requesting the services to pay a just and reasonable compensation. . . .") However, under New Jersey law, the doctrine of quantum meruit only applies if there is no contract between the parties that addresses the identical subject matter of the plaintiff's quantum meruit claim. See Power-Matics, Inc. v. Ligotti, 79 N.J. Super. 294 (App.Div. 1963); Iwanowa v. Ford Motor Co., 67 F. Supp.2d 424 (D.N.J. 1999). Indeed, the Court of Appeals has made it clear that a plaintiff may not bring a claim under a quasi-contract theory of liability (such asquantum meruit or unjust enrichment) when the plaintiff and defendant are parties to an express and valid agreement concerning the identical subject matter as plaintiff's claim.