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Agency is an area of law dealing with a contractual or quasi-contractual relationship between at least two parties in which one, the principal, authorizes the other, the agent, to represent her or his legal interests and to perform legal acts that bind the principal. The agent has a fiduciary relationship with and is under a legal duty to act in the best interests of the principal. An agency can be expressly created for various purposes by contract or appointment, but it can also be implied from the conduct of the parties. Both an "attorney-in-fact" and an "attorney at law" agents. In the former the agent is given a "power of attorney" also known as a mandate in civil law jurisdictions.
Agency relationships are common in many professional areas.
the negotiation of entertainment and sports deals and in many day to day transactions where one person (the "agent") is allowed to stand in for another individual to fulfill their wishes. Models, actors, and athletes have agents who secure opportunities and benefits for them.
Agents can represent the interests of one party, or they may represent the interests of several, conflicting or potentially conflicting parties. In the case of such dual agency the agent must either disclose information received by one party to the other or act in a limited agency capacity to prevent a situation where the agent's loyalty to the multiple principals is compromised.