The law of agency is used in many professional areas, from contract negotiation (business management), employment procurement (i.e. modelling agencies), by financial advisors, in the buying and selling of real estate, 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. 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.
See also: List of Hollywood agencies and management companies