When a business engages another party to act on its behalf, whether to sell products, negotiate contracts, or represent the business in dealings with third parties, it creates a relationship that carries legal consequences far beyond the immediate transaction. The law has long recognized that when one party authorizes another to act in its place, the authorizing party cannot simply disclaim responsibility for what happens next. This principle, known as vicarious liability in common law provinces and civil responsibility for the acts of others under Quebec's civil law framework, forms one of the most significant areas of legal exposure for Canadian businesses engaged in distribution, agency, and franchise arrangements. Understanding when and how a principal becomes legally responsible for the actions of its agent is not merely an academic exercise but a practical necessity for any business owner who relies on others to carry out commercial activities.
The foundation of principal liability rests on the straightforward principle that a person who acts through another acts themselves. This maxim, expressed in Latin as qui facit per alium facit per se, reflects the common law's recognition that allowing businesses to benefit from the actions of their agents while simultaneously avoiding responsibility for those same actions would create an unjust result. The law therefore imputes the actions of an agent to the principal in circumstances where the agent was acting within the scope of their authority or where the principal has created circumstances that lead third parties to reasonably believe the agent possesses authority. In British Columbia, Alberta, Saskatchewan, Ontario, and other common law provinces, this principle has developed through centuries of judicial interpretation and is now well established in commercial practice. Quebec approaches the same fundamental issue through the provisions of the Civil Code of Quebec, particularly articles 2157 through 2165, which as of the date of authorship govern the liability of mandators for the acts of their mandataries. While the terminology differs, with Quebec using mandator and mandatary rather than principal and agent, the underlying policy concern remains consistent: a party who engages another to act on its behalf must accept responsibility for the consequences of that engagement.