Definition
Assumed risk (also rendered as "assumption of risk") is a defense doctrine under which a plaintiff is barred from recovering damages for an injury caused by a risk that the plaintiff voluntarily accepted, either expressly or by conduct. The doctrine rests on the principle that one who knowingly and willingly encounters a known danger cannot later hold another liable for the resulting harm.
The term carries two distinct contexts that researchers must keep separate:
1. Employment context (historical): The classical formulation, dominant in 19th and early 20th century law, arose from the master-servant relationship. A servant (employee) was held, by virtue of the employment contract itself, to have assumed all ordinary risks and dangers incident to the work. This was a contractual inference, not necessarily a product of the employee's actual, subjective consent to any specific hazard.
2. General tort context (modern): Outside the employment setting, assumed risk operates as an affirmative defense to negligence. A plaintiff who, with actual knowledge of a specific risk and appreciation of its magnitude, voluntarily chooses to encounter that risk may be denied recovery. This version focuses on subjective awareness and voluntary choice, not contractual implication.
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Common Confusion
Assumed risk and contributory negligence are frequently conflated but are analytically distinct. Contributory negligence asks whether the plaintiff failed to exercise reasonable care for their own safety — it is an objective, conduct-based standard. Assumed risk asks whether the plaintiff knowingly and voluntarily accepted the risk — it is a subjective, consent-based standard. A plaintiff can assume a risk while behaving entirely reasonably, and can be contributorily negligent without having assumed any risk. The conflation matters most in comparative fault jurisdictions, where courts disagree about whether assumed risk survives as an independent bar or collapses into the comparative negligence calculation.
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Recognized Forms
/SUBTYPES
Express assumption of risk: The plaintiff explicitly agrees in advance, typically by written contract or waiver, to accept the risk of injury from specified dangers. This form survives in most jurisdictions as a matter of contract law.
Implied assumption of risk (primary): The plaintiff, by voluntarily entering a situation involving an inherent risk, implicitly accepts that the defendant owes no duty with respect to that risk. This is a duty question, not a defense in the traditional sense — if no duty exists, no negligence claim can be established.
Implied assumption of risk (secondary): The plaintiff, aware of a risk created by the defendant's negligence, voluntarily proceeds anyway. This is the form most likely to be absorbed into comparative fault analysis and most likely to generate jurisdictional disagreement.
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Why It Matters in Research
The most significant research trap is the doctrine's radical transformation over the 20th century. Historical sources — including Bouvier's — define assumed risk almost exclusively in master-servant terms, treating it as a contractual inference from the employment relationship. Researchers using those sources for modern tort problems will find the framing misleading. The contractual/employment version of the doctrine was largely dismantled by workers' compensation statutes beginning in the early 20th century; those statutes replaced the common law master-servant framework with statutory compensation schemes that deliberately eliminated assumed risk as a defense in the employment context.
In the general tort context, the doctrine's vitality depends heavily on jurisdiction and on which subtype is at issue. Many states that adopted comparative negligence formally abolished secondary implied assumption of risk as a standalone bar, folding it into the comparative fault calculation. Primary implied assumption of risk, reframed as a duty question, has proven more durable. Express assumption of risk, grounded in contract, is the most stable form.
Corpus researchers working in pre-1920 materials will encounter "assumed risk" almost always in the employment context, and the doctrine will be framed in contractual, not tort, terms. Researchers working in mid-to-late 20th century materials will see the doctrine contested and fragmenting, with courts and legislatures actively debating its survival under comparative fault regimes.
The term also appears, with different meaning, in insurance and tax contexts — do not carry tort doctrine into those settings.
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Historical Dictionary Support
Bouvier's defines assumed risk squarely in the master-servant tradition, describing it as a risk growing out of the employment contract by which the servant agrees to assume the ordinary risks and dangers incident to the work. The Bouvier entry emphasizes the contractual basis of the doctrine and notes that the servant cannot be presumed to contract away rights against extraordinary or undisclosed risks — a qualification that was judicially significant in the era when the doctrine was most actively litigated.
This framing accurately reflects the dominant 19th and early 20th century view but is of limited use for understanding the modern doctrine in its tort defense form. Bouvier does not address the primary/secondary distinction that became central to 20th century analysis, nor the doctrine's interaction with comparative negligence. Historical dictionaries generally treat assumed risk as settled and uncontroversial — a posture that obscures the substantial doctrinal instability that followed the workers' compensation movement and the rise of comparative fault.
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Jurisdictional Note
Assumed risk doctrine varies considerably by state. Some jurisdictions have abolished secondary implied assumption of risk entirely, treating it as a species of comparative negligence. Others preserve it as an independent complete bar. Express assumption of risk survives broadly but is subject to public policy limits that vary by state — courts in some jurisdictions will not enforce waivers covering gross negligence or intentional conduct regardless of contractual language.
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Encyclopedia Cross-Reference
Defenses to Negligence — Assumption of Risk (Express), The Law Mind Torts & Personal Injury Encyclopedia
Insurance Contracts — Reinsurance and Risk Transfer, The Law Mind Contracts & Commercial Law Encyclopedia (for risk assumption in the insurance context, which is analytically separate)
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