Stephen A. Ross "The Economic Theory of Agency: The Principal's Problem," Amer. Econom. Rev., 63 (1973), 134-139; As cited in Eisenhardt (1985, 136)
“We define an agency relationship as a contract under which one or more persons (the principal(s)) engage another person (the agent) to perform some service on their behalf which involves delegating some decision making authority to the agent. If both parties to the relationship are utility maximizers there is good reason to believe that the agent will not always act in the best interests of the principal.”
Source: "Theory of the firm: Managerial behavior, agency costs and ownership structure", 1976, p. 308
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Michael Jensen 8
American economist 1939Related quotes
Source: "Theory of the firm: Managerial behavior, agency costs and ownership structure", 1976, p. 308-9

“An agent is usually held accountable to his principals.”
The Economic Tendency of Freethought (1890)
Context: An agent is usually held accountable to his principals. If you do not know the individuals who voted for you, then you do not know for whom you are acting, nor to whom you are accountable. If any body of persons has delegated to you any authority, the disposal of any right or part of a right (supposing a right to be transferable), you must have received it from the individuals composing that body; and you must have some means of learning who those individuals are, or you cannot know for whom you act, and you are utterly irresponsible as an agent.

Erving Goffman (1971), Encounters: Two Studies in the Sociology of Interaction, p. 38; As quoted by R. D. Laing in The Politics of Experience
1970s-1980s

“I detest life-insurance agents: they always argue that I shall some day die, which is not so.”
Insurance up to Date
Literary Lapses (1910)

Hong Kong’s angry young millennials: an interview with Joshua Wong https://www.opendemocracy.net/en/hong-kong-angry-young-millennials-interview-with-joshua-wong/ (1 November 2015)
Source: The Boy Who Was Raised as a Dog: And Other Stories from a Child Psychiatrist's Notebook
Thomas Robbins, Benjamin David Zablocki (2001) Misunderstanding Cults: Searching for Objectivity in a Controversial Field. p. 183
Source: "The bases of social power." 1959, p. 150

Report of the Superintendent of the New York and Erie Railroad to the Stockholders (1856)