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A power of attorney or letter of attorney in common law systems or mandate in civil law systems is an authorization to act on someone else's behalf in a legal or business matter. The person authorizing the other to act is the "principal" or "grantor (of the power)", and the one authorized to act is the "agent" or "attorney-in-fact". The attorney-in-fact acts "in the principal's name" -- for example, by signing the principal's name to documents.

One kind of agent, an attorney-in-fact, is a fiduciary for the principal. The law requires an attorney-in-fact to be completely honest with and loyal to the principal in their dealings with each other. If the attorney-in-fact is being paid to act for the principal, the contract is a separate matter from the power of attorney itself, so if that contract is in writing, it is a separate document, kept private between them, whereas the power of attorney is intended to be shown to various other people.

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