2 Peake N.P. 270, 170 Eng. Rep. 153 (K.B. 1793)
Tarleton v. M'Gawley is a foundational English case in the law of economic torts, frequently cited as an early recognition of the tort of intentional interference with prospective economic relations.
Does an action lie where the defendant, by unlawful means (violence and intimidation), intentionally deters third parties from trading with the plaintiff, thereby causing the plaintiff economic loss, even though no contracts had yet been formed?
A person who, by unlawful means such as violence, threats, or intimidation, intentionally prevents or deters third parties from trading with another is liable in tort for the resulting economic loss. The law permits competition by lawful means, but malicious interference through unlawful acts is actionable even absent a preexisting contract between the plaintiff and the third parties.
Yes. The court held that intentionally and unlawfully frightening away prospective traders from the plaintiff's ship is actionable. The defendant's use of force to prevent trade constituted wrongful interference with the plaintiff's prospective economic relations.
Tarleton v. M'Gawley is a seminal waypoint in the development of the economic torts, especially interference with prospective economic advantage and the unlawful means/intentional harm paradigm. It underscores that liability can attach even where no contract exists if the defendant uses wrongful means to prevent a plaintiff from obtaining business. The case helps students understand the boundary between privileged competition and actionable interference and anticipates later authorities like Lumley v. Gye (contractual interference) and Mogul Steamship Co. v. McGregor (lawful competition). It also exemplifies the common law's use of actions on the case to supply remedies for intentional, indirect economic harms.