The appellant created a calendar and sold advertising space to pharmaceutical companies.
The respondent, a trade association, directed its members not to advertise in the calendar, claiming it violated their Code of Marketing Practices.
This direction destroyed the appellant's business.
The appellant sued for intentional interference with economic relations.
The trial judge found the respondent's initial letter was tortious but cured by a subsequent legitimate ruling.
The Court of Appeal allowed the appeal, finding the respondent had no authority under its Code to prohibit members from advertising in third-party products.
The Court held the unauthorized ruling constituted unlawful means, satisfying the elements of the tort of intentional interference with economic relations, and directed a reference on damages.
