This Article argues that mass torts involving multiple tortfeasors can be welfare enhancing It begins by investigating the role of dilution of liability ” a phenomenon that has been condemned for its role in facilitating accidents According to the literature in alternative care situations where the damage to the victim is constant dilution of liability leads to inefficient precaution levels and consequently to more bad accidents The Article deviates from this literature and shows that dilution of liability can be welfare enhancing This is so even in the quintessential case where dilution of liability has been denounced The Article further shows that an activity that is socially undesirable and should give rise to liability can become des...