However, such persons will nonetheless be held legally responsible for harm that results from their activities as a means of shifting the costs of injury from potential victims to tortfeasors. As a matter of social policy, then, individuals and entities that engage in abnormally dangerous activities for profit must be willing to ensure the safety of others as a price of doing business. Consumers who have been injured by defectively manufactured products also rely on strict liability. Under the doctrine of strict product liability, a manufacturer must guarantee that its goods are suitable for their intended use when they are placed on the market for public consumption. The law of torts will hold manufacturers strictly liable for any injuries that result from placing unreasonably dangerous products into the stream of commerce, without regard to the amount of care exercised in preparing the product for sale and distribution and without regard to whether the consumer purchased the product from, or entered into a contractual relationship with, the manufacturer.
Causation has two prongs.
First, a tort must be the cause in fact of a particular injury, which means that a specific act must actually have resulted in injury to another. In its simplest form, cause in fact is established by evidence that shows that a tortfeasor's act or omission was a necessary antecedent to the plaintiff's injury. If an injury would have occurred independent of the defendant's conduct, cause in fact has not been established, and no tort has been committed. When multiple factors have led to a particular injury, the plaintiff must demonstrate that the tortfeasor's action played a substantial role in causing the injury. Second, plaintiffs must establish that a particular tort was the proximate cause of an injury before liability will be imposed.