This Article proposes a liability-sharing rule that focuses on responsibility, rather than blame, and apportions liability according to the degree to which each party’s actions made the accident more likely. The rule this Article proposes forces each party to bear the costs of any additional risk that is imposed on the other party. Unlike current rules, this rule provides efficient incentives in the face of heterogeneous and imperfect actors, and it can be modified to maintain efficiency when courts imperfectly observe the parties’ actions. Furthermore, the rule provides a coherent basis for apportioning liability, which is lacking in the existing comparative negligence doctrine. This Article argues that the proposed rule is a better fit with tort law’s preference for objective standards. Finally, the focus on responsibility rather than fault could foster a more effective, collaborative approach to preventing accidents.


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