quantum meruit

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In contract law, a quasi-contractual remedy that permits partial reasonable payment for an incomplete piece of work (services and/or materials), assessed proportionately, where no price is established when the request is made.

In contract law, and in particular the requirement for consideration, if no fixed price is agreed upon for the service and/or materials, then one party would request a reasonable price for the said services and/or materials at the end of the job. A common example would be a plumber requested to fix a leak in the middle of the night.