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The term assumption of risk has led to no little confusion because it is used to refer to at least two different concepts, which largely overlap, have a common cultural background, and often produce the same legal result. But these concepts are nevertheless quite distinct rules involving slightly different policies and different conditions for their application. (1) In its primary sense the plaintiff's assumption of a risk is only the counterpart of the defendant's lack of duty to protect the plaintiff from that risk. In such a case plaintiff may not recover for his injury even though he was quite reasonable in encountering the risk that caused it. Volenti non fit injuria. (2) A plaintiff may also be said to assume a risk created by defendant's breach of duty towards him, when he deliberately chooses to encounter that risk. In such a case, except possibly in master and servant cases, plaintiff will be barred from recovery only if he was unreasonable in encountering the risk under the circumstances. This is a form of contributory negligence. Hereafter we shall call this "assumption of risk in a secondary sense."

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Assumption of Risk, 61 Yale L.J. 141 (1952)

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