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Why did the doctrine of consideration become important in English contract law?

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King Henry II and St. Thomas Becket — Common law Henry II (left) disputing with Thomas Becket (center), miniature from a 14th-century manuscript; in the British Library (Cotton MS. Claudius D.ii).

The doctrine of consideration became essential in English common law as a necessary limiting principle for the development of assumpsit.1

Prior to the 16th century, common law actions like debt and covenant were limited to specific scenarios, such as agreements under seal, and failed to provide remedies for informal agreements. As commerce expanded, courts developed assumpsit to make these informal agreements enforceable. To prevent this new, comprehensive remedy from becoming overly broad, courts required that a promise be supported by "consideration"—meaning something of value must be given or promised in exchange.12

Beyond serving as a boundary for legal enforcement, the doctrine performs several vital functions:
* Evidentiary: It provides proof that a contract exists.2
* Cautionary: It protects the promisor from making ill-considered commitments.2
* Deterrent: It discourages transactions of questionable utility.2
* Channelling: It helps parties distinguish between different types of legal transactions.2

Ultimately, consideration ensures that a promise is not merely a formality but a bargained-for exchange.21