quantum valebant

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Under Common Law, i.e. a remedy to compute reasonable damages when a contract has been breached—the implied promise of payment of a reasonable price for goods.

In contract law, for requirements of consideration, reasonable worth for goods delivered.

Usage: quantum merit has replaced quantum valebant (as much as they were worth)  in consideration; in the case of contract remedy, quantum valebant is being used less, and could be considered to be obsolete.