What are the elements of the tort of interference with prospective economic advantage?

To resolve this case we must first understand and apply the controlling principles applicable to the tort of interference with prospective economic advantage. The elements of that tort are: "(1) an economic relationship between [the plaintiff and some third person] containing the probability of future economic benefit to the [plaintiff], (2) knowledge by the defendant of the existence of the relationship, (3) intentional acts on the part of the defendant designed to disrupt the relationship, (4) actual disruption of the relationship, [and] (5) damages to the plaintiff proximately caused by the acts of the defendant." (Buckaloo v. Johnson (1975) 14 Cal.3d 815, 827, 122 Cal.Rptr. 745, 537 P.2d 865.)