In law, agency is the relationship in which one person (the principal) authorizes another (the agent) to act on their behalf, and examples of agency in law fall into five recognized categories: express, implied, apparent, by ratification, and by necessity. Each is created differently, and each distributes risk differently when a deal goes sideways or someone gets hurt. The type you’re dealing with usually decides who pays.
Express Agency
Express agency is the version most people picture. The principal directly tells the agent, in words, what they are authorized to do. The grant can be verbal, but written authorization is strongly preferred because it eliminates arguments later about what the agent could and couldn’t do. The Restatement (Third) of Agency frames the relationship as one that arises when a principal manifests assent that an agent will act on the principal’s behalf and subject to the principal’s control, and the agent consents.1OpenCasebook. Restatement of Agency (Third) Excerpts
A power of attorney is the classic example. It is a legal document that lets someone else handle your financial or legal affairs, from paying bills to managing investments to selling property, and a financial power of attorney can double as a planning tool if you later become unable to make decisions due to illness or injury.2Consumer Financial Protection Bureau. What Is a Power of Attorney (POA)? Attorney fees to draft one typically run between $100 and $500 depending on complexity and location.
Real estate listing agreements are another textbook case. When you hire a broker to sell your home, the listing agreement spells out the broker’s authority to market the property, show it, and negotiate on your behalf. Commission rates have traditionally ranged from about 5% to 6% of the sale price. Following a $418 million antitrust settlement, the National Association of Realtors now prohibits listing broker compensation offers on Multiple Listing Service platforms, and buyers must sign written agreements with their agents, specifying a set rate or dollar amount, before touring homes.3National Association of Realtors. What the NAR Settlement Means for Home Buyers and Sellers The practical effect is that buyer and seller commissions are negotiated separately rather than bundled.
When Written Authority Is Required
For some contracts, a verbal grant of authority is not enough. Under the equal dignities rule, if a contract must be in writing to be enforceable under the statute of frauds, the agent’s authorization to sign that contract must also be in writing. Real estate sales, contracts that cannot be completed within one year, and loan guarantees all fall into this category. If your agent signs one of these deals on your behalf without written authorization, the agreement may not be enforceable against you. People get tripped up here because they assume a handshake with their agent will do, but the law demands the authority match the formality of the underlying deal.
Implied Agency
Implied agency does not come from a written document or an explicit conversation. It arises from the circumstances of a relationship, especially the nature of someone’s role and how business has been conducted in the past. Courts recognize that certain responsibilities naturally attach to certain jobs, even when nobody wrote them down.4Cornell Law Institute. Implied Authority
Take a store manager. The employment contract probably covers overseeing staff and handling daily operations but almost certainly does not list every individual task the manager might perform. If the store runs out of a popular product, the manager has implied authority to reorder inventory, because keeping shelves stocked is part of running a store. Hiring temporary help during a holiday rush is the same idea. No reasonable person would expect the manager to call the owner for permission every time a routine business need comes up.
The question courts ask is whether the agent’s action was reasonably necessary to carry out their assigned duties. A purchasing manager has implied authority to approve purchases. A restaurant general manager has implied authority to order supplies and schedule repairs. The authority flows from the job itself. Agents get into trouble when they stretch implied authority beyond what is customary for the role. A store manager reordering inventory is one thing; the same manager signing a five-year vendor contract is another.
Apparent Agency
Apparent agency is different because it has nothing to do with what the principal actually authorized. It turns on what a third party reasonably believed the agent could do, based on the principal’s own conduct. If a principal creates conditions that make someone look like an authorized representative, the principal is stuck with the consequences even if the “agent” was never formally appointed.1OpenCasebook. Restatement of Agency (Third) Excerpts
Here is how it plays out. A company gives someone a corner office, prints them business cards with the company logo, and lets them use the corporate letterhead. A customer walks in, sees all the trappings of an authorized employee, and signs a contract with that person. Even if the company never formally hired the individual, the customer’s belief was reasonable given everything the company did to create the impression. The company cannot then claim the person had no authority after the customer relied on appearances the company itself manufactured.5Trans-Lex.org. Principle II.4 – Agency by Estoppel / Apparent Authority
The focus is on the principal’s behavior toward the outside world, not on any private understanding between principal and agent. When the principal’s conduct causes a third party to reasonably believe an agent has authority, and the third party acts on that belief in good faith, the principal generally cannot later deny the relationship.
Agency Created Through Ratification
Ratification is the legal equivalent of saying “I didn’t authorize that, but I’m fine with it now.” It happens when someone acts on behalf of another without permission, and the principal later affirms the unauthorized act. The Restatement (Third) treats ratification as the affirmance of a prior act done by another, giving it effect as if the agent had actual authority from the start.6OpenCasebook. Business Associations – Ratification
Three conditions have to be met. The principal must know all the material facts about the transaction, because you cannot ratify something you do not fully understand.7Ohio State Business Law Journal. Ratification, Constructive Consent, and the U.S. Supreme Court The principal must have had the legal capacity to authorize the act at the time of ratification. And the ratification must happen before it would unfairly harm the third party’s rights, for instance before the third party tries to withdraw from the deal.
A common scenario: an employee signs a service contract with a vendor without authority to commit the company. The employer finds out, says nothing, and starts accepting deliveries and making payments. By taking the benefits, the employer has ratified the contract. Once ratification occurs, the principal cannot later claim the agent lacked authority. This stops principals from cherry-picking, keeping the profitable deals and disowning the losers.
Agency by Necessity
Agency by necessity applies in genuine emergencies when an agent must act to protect a principal’s interests and cannot get instructions in time. It is the narrowest category, and courts apply it sparingly. The doctrine traces to commercial situations, particularly shipping and transport, where delay meant total loss.
The classic example involves perishable goods. A truck driver carrying fresh seafood discovers the refrigeration unit has failed and the owner is unreachable. Rather than let the entire load spoil, the driver sells the cargo at a discount to a local buyer. That sale is legally protected under agency by necessity. A ship captain facing a severe storm might similarly jettison part of the cargo to save the vessel and the remaining goods. Courts have generally required three things: the agent genuinely could not communicate with the principal, there was a real commercial necessity for the action, and the agent acted in good faith to benefit the principal rather than themselves.
This doctrine comes up far less often than it once did, largely because modern communication technology makes it harder to argue that reaching the principal was impossible. A century ago, a ship captain mid-Atlantic had a strong case for necessity. Satellite phones and internet access have shrunk the window considerably. Courts look at whether contacting the principal was genuinely impractical, not merely inconvenient.
When the Agent Is Personally Liable
Normally, an agent who signs a contract on behalf of a disclosed principal is not personally on the hook. The contract is between the principal and the third party, and the agent is just the conduit. That protection evaporates when the principal’s identity is not out in the open.
If a third party knows they are dealing with an agent but does not know who the principal is, the principal is “partially disclosed,” and the agent can be held personally liable on the contract. If the third party has no idea an agent is involved at all, the principal is “undisclosed,” and the agent is treated as a direct party to the contract and fully exposed. The burden of making the principal’s identity clear falls on the agent. A third party’s mere suspicion that a principal exists is not enough to let the agent off.
The same personal liability problem arises when an agent exceeds their authority. If you sign a contract claiming to represent a company but lack the actual power to bind it, and the company does not ratify the deal, you may find yourself personally liable for breach. This catches people off guard in business settings, where employees assume they are always covered by their employer. The safer practice is to verify your authority before signing anything and to clearly identify yourself as an agent, and the principal you represent, in every written agreement.
When the Principal Is Liable for the Agent
Agency relationships can create liability running in the other direction too. Under the doctrine of respondeat superior, a principal can be held responsible for wrongful acts committed by an agent during the course of their work. This applies even if the principal had no direct involvement in the wrongful conduct and was not supervising the agent at the time.8Cornell Law Institute. Respondeat Superior
The critical question is whether the agent was acting within the scope of their role. A delivery driver who causes an accident while making a scheduled stop creates liability for the employer. That same driver causing an accident on a personal detour to visit a friend might not. Courts use different tests depending on the jurisdiction; some ask whether the agent’s action could have been of some benefit to the principal, while others ask whether the action was characteristic of the job.
One important limit: respondeat superior generally does not apply to independent contractors. The line between an employee-agent and an independent contractor depends on how much control the principal exercises over the work. Factors include who provides the tools and workspace, whether payment is by the job or by time worked, and how much day-to-day direction the principal gives.8Cornell Law Institute. Respondeat Superior Mislabeling employees as independent contractors to dodge vicarious liability is a strategy courts see through regularly.
How Agency Relationships End
Agency does not last forever, and knowing when authority terminates matters as much as knowing when it starts. Termination happens two ways: by the parties’ own actions, or automatically by operation of law.
Either party can end the relationship voluntarily. The principal can revoke the agent’s authority, the agent can renounce the relationship by notifying the principal, or both can agree to part ways. If the agency was created for a specific task, such as selling a particular piece of property, it ends automatically when the task is complete. If the parties set a time limit, the agency expires when that deadline passes.
Certain events terminate agency as a matter of law regardless of what the parties want. Death of either principal or agent ends the relationship immediately, and any transactions after the time of death are considered void, even if the other party did not yet know. Mental incapacity works similarly, though courts sometimes uphold contracts an agent made with a third party who had no reason to know the principal had become incapacitated. Bankruptcy can also terminate agency when it affects the subject matter of the arrangement, as can destruction of the property involved or a change in law that makes the agency’s purpose illegal.
When a principal revokes an agent’s authority, the principal should notify any third parties who previously dealt with the agent. Without that notice, the former agent may still have apparent authority in the eyes of third parties who do not know the relationship has ended, and the principal could stay liable for transactions those third parties entered in good faith.