Also known as: objective manifestations of assent · manifestation of mutual assent · objective theory of assent
Written by attorneys · grounded in primary & secondary sources — see below
A principle of contract formation under which agreement is determined by the parties' outward expressions of intent rather than their undisclosed subjective thoughts. Mutual assent exists when each party makes a promise or begins performance in a manner that a reasonable person would understand as acceptance of an exchange.
Olivia Owens emailed Overland Transport to confirm delivery of crates by Friday. Owens meant the upcoming business day while Overland meant the calendar Friday two days later. Neither side had reason to know the other's understanding so no contract formed when the crates arrived on the later date.
Orla O'Malley sent Orchard Farms a message listing quantities and prices for apples. Orchard Farms replied that the numbers looked good and began loading the first shipment. Their matching outward statements and conduct showed mutual assent to an exchange even though price details remained open.
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Omar Olson and Olympia Steel reviewed a revised price sheet at a kitchen table and shook hands on the plan. Olympia Steel immediately brought subcontractors to begin site preparation. The parties' words and conduct each supplied the required promise or performance showing assent to the exchange.
Owen Ortega emailed Orbit Communications a detailed feature list and timeline for an app. Orbit replied that the plan looked good and began coding the next week. The sequence of proposal and response constituted the ordinary form of mutual assent through offer and acceptance.
Odin Obeng and Overland Transport exchanged files and began preliminary work on a litigation matter after an in-person discussion of a flat fee. No single document labeled offer or acceptance existed. Their reciprocal actions still supplied a manifestation of mutual assent even though the precise moment of formation could not be identified.
Orion Orlov sent Olympia Steel a written proposal to supply steel at a stated price. Olympia Steel retained the power to complete assent by accepting the offer. When Olympia Steel later began performance consistent with the proposal the acceptance became effective and bound both parties.
Contract formation turns on outward expressions that a reasonable person would understand rather than unexpressed private thoughts. A party's secret reservation does not prevent assent if the words and conduct match the other party's manifestations.
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Yes. Beginning or rendering performance after receiving a proposal can constitute assent when the conduct aligns with the terms invited by the other party. Courts examine whether the actions would lead a reasonable person to infer agreement.
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No mutual assent exists if the meanings are materially different and neither party knows or has reason to know the meaning attached by the other. The contract fails to form because the required matching manifestations are absent.
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No. Mutual assent can arise from oral statements, emails, handshakes, or conduct even when no formal document is executed. A writing requirement applies only when a statute of frauds or other rule is triggered by the facts.
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…courts should not enforce employment security agreements in the absence of evidence of independent consideration and an express manifestation of mutual assent. Although, as explained below, there may be some historical basis for imposing such limitations, any such basis has been eroded by the development of modern contract law and, accordingly,…