 On this Coasean analysis of tort law, there is simply no need for liability to turn on causation. Rather, either tort liability is irrelevant to efficient resource allocation (in a world of low transaction costs), or tort liability should be placed on the cheapest cost-avoider (in a world where transaction costs are high) in order to induce that person to take the cost-effective precautions. In either case, legal liability should not track causal responsibility, for even when there are high transaction costs the causer of a harm need not be the cheapest cost-avoider for that kind of harm.