The Restatements of Torts describe classic cases involving reciprocally limited options as well as the broader problem of causal overdetermination (or multiple sufficient causes). In one such case, two fires have been negligently set. Each fire is sufficient to destroy the owner's property. The fires then converge on the owner's property, destroying it. In that case, the agents have, by hypothesis, each engaged in a negligent act; they have, that is, acted (or failed to act) in a way that is deemed to breach a duty of care they owed to the property owner. A variation on the two fires case involves two agents negligently firing their guns and hitting the same eye of the same person at the same moment. Case III, in contrast, does not involve a double shooting. Rather, b2 simply stands to the side, prepared to shoot if b1 doesn't, as b1 in fact does the shooting. But it is not b2's simply standing there that makes Case III an interesting one, nor his churlish failure to rescue (he can't). It is rather the fact that – like the second fire in the two fires case – he is limiting the options that b1 would otherwise have had to just one: the boy's being shot. Michael D. Green describes the view expressed in the Restatement (Third) of Torts: Liability for Physical Harm 27 cmt. i (Proposed Final Draft No. 1, 2005)(William C. Powers, Jr. and Michael D. Green, reporters): “If two hunters fire negligently at their quarry and their bullets arrive in the plaintiff's eye at the same moment, is either one a cause of the plaintiff's harm? This is just a variation on the familiar ‘two fires’ hypothetical that requires some consideration of the role of the sine qua non test for factual cause. Each hunter is a cause of the harm and liable for the full extent of damages suffered by the victim. Sine qua non will not do here, but there is no doubt that instinctively, rationally, and normatively, we are entirely comfortable describing each hunter's action as a cause of the victim's harm and holding each liable for damages affiliated with the loss of an eye.”
Green, supra note 24, at 681. Green notes that the draft Restatement takes a similar position in the case where the overdetermination is due not to two tortious acts but rather to one tortious and one innocent act: “In conclusion, causation has taken the day and determined that the tortfeasor who concurs with an innocent cause is liable for damages reflecting the overdetermined harm. Note that the audience is no worse off because of Landsman's tortious (and heinous) act, as they would have suffered equally in a tort-free world.” Green, at 687. Thus, the relevant section “applies regardless of whether the other cause involves tortious conduct or consists only of innocent conduct. As long as the competing cause was sufficient to produce the same harm as the defendant's tortious conduct, this Section is applicable.” Green, at 687 (citing draft Restatement at 27 cmt. d). MCH2, below, similarly addresses the case of the one tortious and one innocent act in the same way it addresses the case of the two tortious acts. Another challenging scenario arises when both an agent's act and some natural event are sufficient to impose a diminution in wellbeing for
p. Do we still say that the agent has harmed p? MCH2, as drafted, will not have that implication. We are left then, under MCH2, with the result that the agent may be considered to harm p when another agent's innocent act is sufficient to cause that same harm but not when nature is sufficient to cause that same harm.
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