Playbook 2: The Liability Playbook
Who Owes What — Principal, Agent & Third Parties
Summary: This playbook maps liability across the agency triangle — principal, agent, and third parties. It covers authority as the gateway to liability, vicarious liability (respondeat superior), tort and contractual liability, criminal exposure, and key defenses including the independent contractor distinction and ratification.
Chapter 1 — Authority as the Gateway to Liability
1.1 Actual Authority — Express vs. Implied
Actual authority is the power of an agent to bind the principal that the principal has intentionally conferred upon the agent, either expressly or by implication. It forms the primary basis for holding a principal liable for an agent's acts.
Express authority is granted by written or spoken words — for example, a power of attorney, a board resolution, or explicit oral instructions.
Implied authority is incidental to express authority. It includes all acts reasonably necessary to accomplish the express mandate. As Munday explains, implied authority covers "such acts as are incidental to the performance of the agent's express authority."
Key principle: The agent's actual authority is determined by the principal's manifestations to the agent, not by the agent's own beliefs or representations.
1.2 Apparent Authority — When the Principal's Conduct Binds Them
Apparent authority (also called ostensible authority) arises from the principal's manifestations to third parties. Even if the agent has no actual authority, the principal may be bound if the principal "cloaked" the agent with indicia of authority and a third party reasonably relies on that appearance.
The classic formulation from Illinois Central Railroad Co. v. Jennings (1905) states: "It rested upon the plaintiff to affirmatively show that the act was within the apparent scope of the authority of the employee and that he did not know or have reasonable grounds to believe that the employee was exceeding his authority."
Three elements must be proved:
- The principal made a manifestation to the third party
- The third party reasonably relied on that manifestation
- The third party changed position in reliance
Chapter 2 — Vicarious Liability (Respondeat Superior)
2.1 Scope of Employment Test
Under the doctrine of respondeat superior, an employer (principal) is vicariously liable for an employee's (agent's) tortious conduct when the employee acts within the scope of employment.
The classic three-part test from Chesterman v. Barmon (1988) requires:
- Time and space: The conduct must have occurred substantially within the time and space limits authorized by the employment
- Motivation: The employee must have been motivated, at least partially, by a purpose to serve the employer
- Kind of act: The act must have been of a kind that the employee was hired to perform
The focus is on the act itself, not on when the act results in injury.
Harkness v. Platten, 2015 — Casetext
2.2 Frolic and Detour — When Liability Ends
An employee acting within the scope of employment binds the principal. However, liability ends when the employee embarks on a "frolic" — a substantial deviation from the employer's business for the employee's own purposes.
Key distinction:
- Detour: A minor deviation — principal remains liable
- Frolic: A substantial deviation — principal not liable
In Austin v. Kaness, the Wyoming Supreme Court held that a son who hosted a party at his parents' home while they were out of town — an act "without their consent or knowledge" — was not within the scope of any agency relationship that may have existed for feeding pets and bringing in mail.
Chapter 3 — Tort Liability
3.1 Principal Liable for Agent's Negligence
A principal may be held vicariously liable for an agent's torts committed within the scope of the agency. This liability extends to negligence, intentional torts, and strict liability claims.
In State ex rel. Mountain Grove Creamery v. Cox (1926), the Missouri Supreme Court addressed whether a principal remains liable when an agent renounces the agency. The court held that once Moore repudiated his agency and operated the creamery for himself, he ceased to be an agent — and the principal was no longer vicariously liable.
Key principle: The agency relationship must actually exist at the time of the tortious act. A principal is not liable for acts of a former agent who has renounced the agency, even if the agent later accounts for profits.
3.2 Agent's Personal Tort Liability to Third Parties
An agent is personally liable for their own tortious acts, even when acting on behalf of a disclosed principal. The agent cannot shield themselves from liability merely by invoking the agency relationship.
- An agent who commits negligence, fraud, or misrepresentation is personally liable
- Liability extends to joint tortfeasance with the principal
- The principal's liability does not displace the agent's personal responsibility
Chapter 4 — Contractual Liability
4.1 Disclosed, Partially Disclosed, and Undisclosed Principals
The agent's personal liability on contracts depends on whether the principal is disclosed to the third party.
- Disclosed principal: The third party knows the agent is acting for a named principal — the agent is generally not personally liable
- Partially disclosed principal: The third party knows an agency exists but not the principal's identity — the agent may be liable
- Undisclosed principal: The third party believes they are contracting with the agent personally — the agent is fully liable
In Ads Plus v. Ault (2024), the court examined whether Robert Ault was personally liable on a contract where his corporate principal was not disclosed. The court found disputed facts as to whether the third party believed it was contracting with the individuals or the corporation.
4.2 Agent's Personal Liability on Contracts
An agent who contracts on behalf of a principal may be personally liable in three circumstances:
- Undisclosed principal: The agent is personally liable by default
- Warranty of authority: The agent impliedly warrants they have authority — if they lack it, they are liable for breach
- Contractual provision: The parties may agree that the agent is personally liable
As Munday notes, "unless the agent and the third-party agree otherwise, an agent is liable for a contract entered into on behalf of an unidentified principal."
Chapter 5 — Criminal and Statutory Liability
5.1 When Agents Expose Principals to Penalties
Principals may face criminal and statutory liability for the acts of their agents in several contexts:
- Regulatory offenses: Many statutes impose strict liability on principals for agents' violations (e.g., environmental, food safety, securities laws)
- Corporate criminal liability: Corporations can be held criminally liable for agents' acts within the scope of employment, even without proof of corporate intent
- Vicarious criminal liability: Some jurisdictions impose criminal liability on employers for employee misconduct (e.g., liquor licensing, workplace safety)
Chapter 6 — Defenses and Limitations
6.1 Independent Contractor Distinction
A principal is generally not vicariously liable for the torts of an independent contractor. The key test is the principal's "right to control" the manner and means of the contractor's work.
However, there are exceptions:
- Non-delegable duties: Certain duties (e.g., in highly regulated industries) cannot be delegated
- Apparent agency: If the principal represents the contractor as an agent, liability may attach
- Inherently dangerous activities: Liability may attach for ultra-hazardous work
In the gig economy context, Dean v. Uber Technologies Inc. (2026) represents a landmark where a jury found apparent agency based on brand marketing and consumer experience.
6.2 Ratification as a Retroactive Fix
Ratification is the affirmance by a principal of a prior act that did not bind them but was done or professedly done on their behalf.
Requirements for effective ratification:
- The principal must have full knowledge of all material facts
- The principal must accept the transaction with the intention of being bound
- Ratification must occur while the principal still has the capacity to act
In United States v. Comey (2025), the court rejected an attempt to ratify an indictment because the ratification "came too late in the day to be effective" — the statute of limitations had already expired.
United States v. Comey (2025) — FindLaw
Chapter 7 — Key Case Clips: Landmark Liability Rulings
⚖️ Dean v. Uber Technologies Inc. (2026) — Apparent Agency in Gig Economy
In a landmark case, a jury found a gig economy principal liable for injuries by an independent contractor under apparent agency. The decision emphasized brand marketing, consumer experience, and the principal's control of the transaction as evidence of apparent agency.
⚖️ State ex rel. Mountain Grove Creamery v. Cox (1926) — Termination of Agency & Tort Liability
The Missouri Supreme Court held that a principal is not vicariously liable for acts of an agent who has renounced the agency, even if the agent later accounts for profits. The agency relationship must actually exist at the time of the tortious act.
⚖️ Austin v. Kaness (1997) — Scope of Employment / Frolic
The Wyoming Supreme Court affirmed summary judgment for parents whose adult son hosted a party at their home without consent. The son's act was not within the scope of any agency relationship for pet-sitting and mail collection.
⚖️ Ads Plus v. Ault (2024) — Undisclosed Principal & Personal Liability
The court examined whether an individual was personally liable for a contract where no written agreement existed and the third party believed it was contracting with the individual rather than a corporate principal.
⚖️ United States v. Comey (2025) — Ratification Timing
The federal court rejected an attempt to ratify an indictment after the statute of limitations had expired, holding that ratification "came too late in the day to be effective."
FAQ
What is the difference between actual and apparent authority?
Actual authority is conferred by the principal to the agent through express or implied communication. Apparent authority arises from the principal's manifestations to third parties — even without actual authority, the principal may be bound if a third party reasonably relies on appearances.
Harrison v. Dean Witter Reynolds — Justia
When is a principal NOT liable for an agent's tort?
A principal is generally not liable when: (1) the agent is an independent contractor and no exception applies; (2) the agent acts outside the scope of employment (frolic); (3) the agent has renounced the agency; or (4) the principal had no control over the agent's conduct.
How does ratification affect a principal's liability?
Ratification retroactively confers authority on an agent's unauthorized act, binding the principal as if the act had been authorized from the outset. It requires full knowledge of material facts and an intention to be bound. Timing is critical — ratification cannot occur after the statute of limitations has expired.
United States v. Comey — FindLaw
References
Business Associations: Agency Law — Open Casebooks
State ex rel. Mountain Grove Creamery v. Cox, 286 S.W. 368 (Mo. 1926) — Casetext
Austin v. Kaness, 950 P.2d 561 (Wyo. 1997) — OSCN
Harrison v. Dean Witter Reynolds, 974 F.2d 873 (7th Cir. 1992) — Justia
Apparent Agency Liability and Gig Economy Defendants — BARBRI CLE (2026)
Munday, R., Agency: Law and Principles, 3rd Ed. (2016) — Yale Library
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