Agency cost

An agency cost is an economic concept concerning the fee to a "principal" (an organization, person or group of persons), when the principal chooses or hires an "agent" to act on its behalf. Because the two parties have different interests and the agent has more information, the principal cannot directly ensure that its agent is always acting in its (the principal's) best interests.

Common examples of this cost include that borne by shareholders (the principal), when corporate management (the agent) buys other companies to expand its power, or spends money on wasteful pet projects, instead of maximizing the value of the corporation's worth; or by the voters of a politician's district (the principal) when the politician (the agent) passes legislation helpful to large contributors to their campaign rather than the voters. Though effects of agency cost are present in any agency relationship, the term is most used in business contexts.

The costs consist of two main sources:

The information asymmetry that exists between shareholders and the Chief Executive Officer is generally considered to be a classic example of a principal–agent problem. The agent (the manager) is working on behalf of the principal (the shareholders), who does not observe the actions, or many of the actions, or is not aware of the repercussions of many of the actions of the agent. Most importantly, even if there was no asymmetric information, the design of the manager's contract would be crucial in order to maintain the relationship between their actions and the interests of shareholders.

Information asymmetry contributes to moral hazard and adverse selection problems.

Agency costs mainly arise due to contracting costs and the divergence of control, separation of ownership and control and the different objectives (rather than shareholder maximization) the managers.

Professor Michael Jensen of the Harvard Business School and the late Professor William Meckling of the Simon School of Business, University of Rochester wrote an influential paper in 1976 titled "Theory of the Firm: Managerial Behavior, Agency Costs and Ownership Structure". Professor Jensen also wrote an important paper with Eugene Fama of University of Chicago titled "Agency Problems and Residual Claims".

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