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Quantum meruit is a Latin phrase meaning "what one has earned". In the context of contract law, it means something along the lines of "reasonable value of services".
In the United States, the elements of quantum meruit are determined by state common law. For example, to state a claim for unjust enrichment in New York, a plaintiff must allege that (1) defendant was enriched; (2) the enrichment was at plaintiff's expense; and (3) the circumstances were such that equity and good conscience require defendants to make restitution.
Quantum meruit is the measure of damages where an express contract is mutually modified by the implied agreement of the parties, or not completed. While there is often confusion between the concept of quantum meruit and that of "unjust enrichment" of one party at the expense of another, the two concepts are distinct.
The concept of quantum meruit applies in (but is not limited to) the following set of situations:
The measure of value set forth in a contract is legally admissible as evidence of the value of the improvements or services but the court (or thus out of court settlement) is not required to use the contract's terms when calculating a quantum meruit award. (This is because the values set forth in the contract are rebuttable, meaning the one who ultimately may have to pay the award can contest the value of services set in the contract.)
I. An example used in United States law schools is usually the case of Steven v Bromley & Son .
II. Person A (plaintiff in this hypothetical) tells neighbor B (defendant) that he is going to build a wall on their property that will give a benefit to both A and B; A implies that it would be cheaper for both of them if A performs the labor instead of hiring a professional. B agrees that the wall should be built, but no price is negotiated. A builds the wall, and then asks B to compensate him for the benefit of the wall that he conferred on B (usually half the value of the wall). B refuses. A is entitled to some compensation based on quantum meruit. This is because there was an implied promise between A and B, which is derived from contract law, because A was acting under the assumption that B would pay for part of his services (see Estoppel). The winning of the case, or damages that would be agreed in any out of court settlement, will be directed as an assumpsit on a quantum meruit. Day v. Caton, 119 Mass. 513 (1876).
III. Quantum meruit can also apply where there is a breached contract.
IV. If a contractor finds part of their work replaced by others through no fault of their own, they seek damages for the amount(s) that the defendant benefited. Third parties, absent provisions preventing, such as new contractors finding the work more complex as a result of defects may, just as with all equitable actions, like a quantum meruit-basis restitution, promptly to avoid the doctrine of laches (equity) (having let matters lie) bring action against that contractor.
V. A promoter enters into a long-term service contract with a theatre to help book and organise shows for no one else for a few months. They take part-paid bookings for shows over these months but pass on none of that as agreed as they have grounds to allege the theatre is unsafe and the theatre need to make it safe. The theatre performs no repairs. Instead, the theatre terminates the contract before the benefit of the shows. After this the theatre runs most of the shows and gains benefit but does not pay the promoter. Some shows the theatre cancels without cause. A court would decide, following similar precedent, that the promoter is entitled to an assumpsit on a quantum meruit if the promoter has acted in a proportionate way as trustee (depository), delaying forwarding of the principal of the ticket sale part-payments, for sufficiently well-founded premises defects which could have affected its reputation.