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Chapter 12: Liability of Principals and Agents to Third Parties
🎯 Learning Objectives
- Distinguish between contract liability and tort liability in agency.
- Explain when a principal is bound by an agent’s contracts (actual authority, apparent authority, ratification).
- Describe the effects of disclosing, partially disclosing, or not disclosing the principal’s identity.
- Understand the doctrine of respondeat superior and the scope of employment test for tort liability.
- Analyze landmark cases: Lloyd v. Grace, Smith & Co. (apparent authority), Christensen v. Swenson (scope of employment), Ira S. Bushey & Sons, Inc. v. United States (frolic and detour).
- Identify when an agent is personally liable to third parties.
📖 Introduction
One of the most critical questions in agency law is: who is liable to a third party when an agent acts? The answer depends on the nature of the liability (contract or tort), the agent’s authority, whether the principal’s identity was disclosed, and whether the agent was acting within the scope of employment. This chapter explores the rules that govern liability of principals and agents to third parties, from the contract liability arising from authorized acts to the tort liability imposed by respondeat superior. Landmark cases illustrate the boundaries of authority and the scope of employment, helping businesses understand the risks of employing agents and the potential personal exposure of agents.
12.1 Contract Liability of Principal and Agent
When an agent enters into a contract with a third party, liability depends on whether the agent had authority and whether the principal’s identity was disclosed.
Authorized Acts
If the agent acts with actual or apparent authority, the principal is bound on the contract. The agent is generally not personally liable (unless the agent agreed to be).
Apparent Authority: Even if the agent lacks actual authority, the principal may be bound if the principal’s conduct leads a third party to reasonably believe the agent has authority. Lloyd v. Grace, Smith & Co. (1912) – a solicitor’s clerk fraudulently induced a client to convey property; the firm was held liable because they held the clerk out as having authority.
Unauthorized Acts
If the agent lacks actual or apparent authority, the principal is not bound unless the principal ratifies the act. The agent, however, may be personally liable to the third party for breach of implied warranty of authority.
Disclosed, Partially Disclosed, and Undisclosed Principals
- Disclosed principal: The third party knows the agent is acting for a specific principal. Only the principal is liable on the contract; the agent is not.
- Partially disclosed principal: The third party knows there is a principal but does not know the identity. Both the principal and the agent may be liable; the third party can elect to sue either.
- Undisclosed principal: The agent appears to be acting on their own behalf. The third party can hold the agent liable, but once the principal is discovered, the third party may elect to hold the principal liable as well (subject to certain defenses).
12.2 Tort Liability: Respondeat Superior
Under the doctrine of respondeat superior (“let the master answer”), an employer (principal) is vicariously liable for torts committed by an employee (agent) within the scope of employment. The policy rationale is to place the cost of accidents on the business that benefits from the activity.
Scope of Employment
An employee’s conduct is within the scope of employment if it is:
- Of the kind the employee is employed to perform;
- Substantially within authorized time and space limits; and
- Motivated, at least in part, by a purpose to serve the employer.
Case Law: Christensen v. Swenson (1956) – A truck driver intentionally swerved to hit another driver after a dispute; the court found the act was not within the scope of employment because it was purely personal and unrelated to the employer’s business.
Frolic and Detour
If an employee deviates from the employer’s business (a “frolic”), the employer is not liable. If the deviation is minor (a “detour”), liability may still attach.
Case Law: Ira S. Bushey & Sons, Inc. v. United States (1968) – A drunken sailor, returning to his ship, damaged a drydock. The court held the government liable, reasoning that the sailor’s conduct was foreseeable and within the scope of employment because it occurred while he was returning to duty.
Independent Contractors
Generally, a principal is not vicariously liable for the torts of an independent contractor. Exceptions exist for non‑delegable duties (e.g., hazardous activities) or when the principal retains control over the contractor’s work.
Case Law: Humble Oil & Refining Co. v. Martin (1949) – A service station operator was held to be an employee, not an independent contractor, because the oil company exercised extensive control over operations; thus, the company was liable for the operator’s negligence.
12.3 Agent’s Personal Tort Liability
Even if the principal is vicariously liable, the agent remains personally liable for their own torts. The injured third party may sue both the agent and the principal (or either). The agent cannot avoid liability by claiming they were acting on behalf of the principal.
12.4 Criminal Liability
Generally, a principal is not criminally liable for crimes committed by an agent, unless the principal participated, directed, or authorized the crime. However, under certain regulatory statutes (e.g., environmental, safety), a principal may be held strictly liable for the acts of employees.
📊 Real-World Example: Delivery Driver Accident
Scenario: A delivery driver for a pizza chain, while making a delivery, runs a red light and hits a pedestrian. The driver was on the clock and using the employer’s vehicle.
Application: The driver is personally liable for negligence. Under respondeat superior, the pizza chain is also vicariously liable because the driver was acting within the scope of employment (delivering pizzas). The pedestrian can sue both the driver and the chain for damages.
💡 Key Terms
Actual authority
Apparent authority
Ratification
Disclosed principal
Undisclosed principal
Respondeat superior
Scope of employment
Frolic and detour
Independent contractor
Vicarious liability
🧠 Summary
Liability in agency depends on the type of claim and the agent’s authority. For contracts, a principal is bound when the agent has actual or apparent authority, or when the principal ratifies. The agent may be personally liable if the principal is undisclosed or if the agent lacks authority. For torts, respondeat superior makes employers vicariously liable for torts committed by employees within the scope of employment. Independent contractors generally do not create vicarious liability unless the principal controls the work or the duty is non‑delegable. Agents remain personally liable for their own torts. Understanding these rules is essential for managing business risk and structuring relationships.
❓ Knowledge Check
1. Under respondeat superior, an employer is vicariously liable for an employee’s tort if:
2. If an agent contracts with a third party on behalf of a disclosed principal and has actual authority, who is liable on the contract?
3. In Ira S. Bushey & Sons, Inc. v. United States, the court found the government liable because:
📖 Further Reading
- Lloyd v. Grace, Smith & Co. [1912] AC 716 (HL).
- Christensen v. Swenson, 271 P.2d 682 (Utah 1954).
- Ira S. Bushey & Sons, Inc. v. United States, 398 F.2d 167 (2d Cir. 1968).
- Humble Oil & Refining Co. v. Martin, 222 S.W.2d 997 (Tex. 1949).
- Restatement (Third) of Agency, §§ 1.04, 2.01‑2.03, 7.01‑7.08.
© 2026 Kateule Sydney / E-cyclopedia Resources. All rights reserved. This work is adapted from open educational resources and original research. For permissions: kateulesydney@gmail.com
Disclaimer: For educational purposes only. Not legal advice. Laws may change. Consult a qualified attorney for specific cases.
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