When is enrichment unjust?

While affirming a relatively straightforward judgment in a home loan dispute, the Fifth Court observed: “The unjust enrichment doctrine applies principles of restitution to disputes where there is no actual contract and is based on the equitable principle that one who receives benefits which would be unjust for him to retain ought to make restitution.” Ihde v. First Horizon Home Loans, No. 05-15-01084-CV (Nov. 28, 2016) (mem. op.) (emphasis added) A counterpoint in this practical but rarely-visited area of remedies law appears in City of Harker Heights v. Sun Meadows Land Ltd., 830 S.W.2d 313, 317 (Tex. App.–Austin 1992, no writ), which observes: “An action for money had and received may be founded upon an express agreement or one implied in fact, but it is not dependent upon either.” (emphasis added).