Many agreements contain specified circumstances whose occurrence signals the end of the agency. The most obvious of these circumstances is the expiration of a fixed period of time (“agency to terminate at the end of three months” or “on midnight, December 31”). An agreement may also terminate on the accomplishment of a specified act (“on the sale of the house”) or following a specific event (“at the conclusion of the last horse race”).
Mutual consent between the parties will end the agency. Moreover, the principal may revoke the agency or the agent may renounce it; such a revocation orrenunciation of agency would be an express termination. Even a contract that states the agreement is irrevocable will not be binding, although it can be the basis for a damage suit against the one who breached the agreement by revoking or renouncing it. As with any contract, a person has the power to breach, even in absence of the right to do so. If the agency is coupled with an interest, however, so that the authority to act is given to secure an interest that the agent has in the subject matter of the agency, then the principal lacks the power to revoke the agreement.