Definition
Quantum valebat (Latin: "as much as it was worth") is a common law pleading form and implied contractual claim that allows a seller to recover the reasonable value of goods sold and delivered to a buyer when no price was specified at the time of sale. Where the parties agreed to a transfer of goods but left the price unstated, the law implies a promise by the buyer to pay the fair market value of those goods. The plaintiff's declaration alleged that the defendant promised to pay as much as the goods were worth, averred a specific value, and claimed that sum as damages.
Quantum valebat is one of the classical common counts in assumpsit — the family of pleading forms used to recover on implied or informal contractual obligations without pleading a formal express agreement.
Common Language
Wiktionary: "A count in an action to recover from the defendant, for goods sold, as much as they were worth."
There is no meaningful ordinary-English usage of this term. It is pure legal Latin, encountered only in pleading practice and legal history. No COMMON LANGUAGE gap analysis is required.
Common Confusion
Quantum valebat is frequently confused with quantum meruit, its near-parallel common count. The distinction is categorical: quantum valebat applies to goods sold and delivered; quantum meruit ("as much as he deserved") applies to services rendered. Both are common counts in assumpsit, both rest on implied promises, and both seek recovery of reasonable value rather than a stipulated price — but they attach to different subject matter. Researchers encountering either term in historical pleadings should confirm which type of performance underlies the claim before applying doctrine from one count to the other.
Why It Matters in Research
Quantum valebat is primarily a historical pleading term. Modern pleading systems — notice pleading under the Federal Rules of Civil Procedure and equivalent state regimes — abolished the formal common counts as distinct required forms. A contemporary plaintiff seeking the same recovery simply pleads unjust enrichment or breach of implied contract. Researchers working in pre-twentieth-century case law, particularly English common law reporters and early American state court records, will encounter quantum valebat as a live procedural category, not merely a Latin flourish.
Two research traps are common. First, because the common counts were formulaic, the presence of quantum valebat in a declaration does not reliably reveal the underlying facts of the transaction — the count was often pleaded alongside other common counts as a matter of practice, regardless of which theory was actually being pressed at trial. Second, the implied promise that the term rests on is a legal fiction: courts enforced it not because a real promise was made, but because fairness required the buyer to pay. Researchers mapping the history of unjust enrichment doctrine should treat quantum valebat as a doctrinal ancestor of modern restitution claims, while recognizing that it was framed in contract language rather than equitable language.
Corpus researchers should also note that quantum valebat appears in treatises on pleading (Chitty, Gould, Stephen) and in digests organized by the common counts. It will not always be indexed under restitution or unjust enrichment in older sources, requiring cross-reference to the pleading literature.
Historical Dictionary Support
Bouvier's Law Dictionary provides the foundational treatment: where goods are sold without specifying a price, the law implies a promise from the buyer to pay as much as the goods were worth. The plaintiff's declaration recited this implied promise, averred the specific value of the goods, and claimed that sum. Bouvier's framing is consistent with standard common law pleading doctrine and tracks the classical structure of the common counts.
What Bouvier does not address — and what no nineteenth-century legal dictionary fully synthesizes — is the relationship between quantum valebat and the emergence of unjust enrichment as an independent cause of action. The historical dictionaries treat quantum valebat as a pleading form; modern restitution scholarship treats it as evidence of a substantive principle that courts were enforcing under the cover of implied contract. That theoretical reframing is absent from the historical sources and must be supplied by the researcher consulting twentieth-century treatises on restitution.
Jurisdictional Note
Quantum valebat as a formal pleading count is largely obsolete in American and English practice following procedural reform. However, the substantive principle it embodies — recovery of reasonable value for goods delivered without an agreed price — survives in every common law jurisdiction under modern unjust enrichment and quasi-contract doctrine. The term may still appear in jurisdictions that retain or reference common law pleading forms in their civil procedure rules.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Implied Contract; Assumpsit; Unjust Enrichment; Common Counts