Economic Torts in UK Law

To be liable for inducing breach of contract, you must know that you are inducing a breach of contract. It is not enough that you know that you are procuring an act which, as a matter of law or construction of the contract, is a breach. Nor does it matter that you ought reasonably to have done so. He took the information in the honest belief that the employee would not be in breach of contract.

It is enough to say that if there is more than one purpose actuating a combination, liability must depend on ascertaining the predominant purpose. If that predominant purpose is to damage another person and damage results, that is tortious conspiracy. If the predominant purpose is the lawful protection or promotion of any lawful interest of the combiners (no illegal means being employed), it is not a tortious conspiracy, even though it causes damage to another person.

But when conspirators intentionally injure the plaintiff and use unlawful means to do so, it is no defence for them to show that their primary purpose was to further or protect their own interests; it is sufficient to make their action tortious that the means used were unlawful.

The circumstances must be such as to make the conduct sufficiently reprehensible to justify imposing on those who have brought about the harm liability in damages for having done so. Bearing that in mind, the proposition that a combination of two or more people to carry out a scheme that is criminal in its nature and is intended to cause economic harm to some person does not, when carried out with that result, constitute a tort actionable by that person is, in my opinion, unacceptable.

The successful pursuit of commercial self-interest necessarily entails the risk of damaging the commercial interests of others. Identifying the point at which it transgresses legitimate bounds is therefore a task of exceptional delicacy. The elements of the four established economic torts are carefully defined so as to avoid trespassing on legitimate business activities or imposing any wider liability than can be justified in principle.

Professor Weir and most other writers, including Hazel Carty and Messrs Sales and Stilitz, are of the view that the gist of all the economic torts is the intentional infliction of economic harm. It is, however, very different from knowledge that economic harm will follow as a result of incidental consequences of conduct, when those consequences are not necessary steps in achieving the object of the conduct and are unsought.

Although my conclusion on the issue of unlawful means makes it unnecessary to decide the point, I would support Arden LJ's view at [127] that it is a defence to an action for conspiracy to injure by unlawful means if the defendant not only acted to protect his own interests, but did so in the belief that he had a lawful right to act as he did.