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KembaraXtra – Legal Terms – Res Extincta


Res extincta is a Latin term meaning “a thing that has ceased to exist.” In law, the phrase is primarily associated with the doctrine of mistake in contract law. It refers to situations where the subject matter of an agreement no longer exists at the time the contract is formed. Because the parties are mistaken about a fundamental fact, the contract may be void. The doctrine protects parties from being bound by agreements concerning non-existent property.


The concept typically arises when both parties believe that a particular object or asset still exists. Unknown to them, the subject matter may already have been destroyed or otherwise ceased to exist. Since the agreement is based upon a mistaken assumption, there may be no valid contract. The mistake goes to the very foundation of the transaction. Courts treat such situations differently from ordinary commercial risks.


A classic example involves the sale of goods. Suppose a seller agrees to sell a specific cargo of goods believed to be available. If the cargo had already been destroyed before the contract was concluded, the subject matter no longer exists. Both parties have entered the agreement under a fundamental mistake. The contract may therefore be void for mistake.


The doctrine is closely linked to fairness and contractual consent. Genuine agreement requires that both parties understand the essential nature of the transaction. When the subject matter has ceased to exist, that understanding is absent. The law recognizes that enforcement would be unjust in such circumstances. Accordingly, the contract may be treated as having no legal effect.


Res extincta illustrates how mistake can undermine contractual validity. It demonstrates that not every apparent agreement results in an enforceable contract. The existence of the subject matter is often a basic assumption underlying commercial transactions. Where that assumption proves false, the law may intervene to prevent unfair outcomes. As a result, res extincta remains an important principle within the law of contractual mistake.

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