Under the [[common law]] of torts, in order to establish [[causation]], a [[plaintiff]] must prove that an actor's conduct "is a substantial factor in bringing about the harm." 2 Restatement (Second) of Torts § 431(a) at 428 (1965). That standard has two dimensions. | Under the [[common law]] of torts, in order to establish [[causation]], a [[plaintiff]] must prove that an actor's conduct "is a substantial factor in bringing about the harm." 2 Restatement (Second) of Torts § 431(a) at 428 (1965). That standard has two dimensions. |