Causality and causation in tort law

This paper considers alternative approaches to dealing with causal uncertainty in strict liability tort regimes. Beginning from the philosophical literature on causing, a distinction is made between the scientific idea of causality and the legal idea of causation. This distinction is generalized to a context of causal uncertainty and associated probabilities are constructed. It is shown that a rule of proportional liability whereby the tortfeasor pays damages in proportion to the probability in causation of them having caused the damage would be socially efficient. This contrasts with the implied use of the probability in causality by the courts and in the law and economics literature on causal uncertainty.