Agency theory explained (principals, agents and agency costs)

By Adam Niazi FCCA ยท Last updated 12 October 2026

Agency theory (Jensen and Meckling, 1976) describes what happens when owners (principals) hire directors (agents) to run a company. Agents may act in their own interests, so owners incur agency costs to monitor and align them. Corporate governance exists largely to reduce these costs.

PrincipalShareholdersDelegates toand monitorsAgentDirectors
The principal-agent relationship

Key terms

TermMeaning
PrincipalThe party who delegates: usually shareholders
AgentThe party who acts on the principal's behalf: usually directors and managers
Agency problemThe agent's interests differ from the principal's
Information asymmetryThe agent knows more than the principal about the business
Moral hazardThe agent takes risks or shirks because the principal bears the cost
Agency costsMonitoring costs + bonding costs + residual loss (Jensen and Meckling, 1976)

Source: Jensen and Meckling (1976), Journal of Financial Economics.

Examples of agency problems

  • Directors paying themselves excessive bonuses, or bonuses tied to short-term targets.
  • Empire building: acquisitions that make the company bigger but not more valuable.
  • Avoiding risky but worthwhile projects to protect their own jobs, or taking excessive risks when bonuses reward it.
  • Manipulating reported results to hit targets.

Other agency relationships

The classic case is shareholders and directors, but SBL scenarios also feature: majority versus minority shareholders (especially in family firms), shareholders versus lenders (risky projects shift risk to lenders), and the board versus managers lower down.

How governance reduces agency costs

MechanismHow it helps
Independent non-executive directorsMonitor executives on shareholders' behalf
Audit committee and external auditCheck the accuracy of what agents report
Remuneration committee and long-term incentivesAlign pay with shareholder value
Transparent reportingReduces information asymmetry
Shareholder engagement and votingOwners hold directors to account

Agency theory vs stewardship theory

Agency theory assumes agents are self-interested and need monitoring. Stewardship theory assumes directors want to do a good job and act as responsible stewards, so trust and empowerment work better than heavy controls. In an evaluation answer, mentioning both shows balance. See also stakeholder theory.

Agency theory in ACCA SBL

Use it to explain why a governance weakness in the case matters, for example a CEO who sets his own pay, then recommend governance fixes. Always tie the agency problem to a specific fact in the scenario.

FAQs

What is agency theory?

A theory of the relationship between principals (such as shareholders) who delegate work to agents (such as directors). Because agents may act in their own interests, principals incur costs to align and monitor them.

Who developed agency theory?

Michael Jensen and William Meckling, in their 1976 paper 'Theory of the firm: Managerial behavior, agency costs and ownership structure' in the Journal of Financial Economics.

What are agency costs?

Monitoring costs paid by the principal (for example audits and NED fees), bonding costs taken on by the agent to show they are trustworthy, and the residual loss that remains when interests are still not fully aligned.

What is the agency problem?

The conflict of interest that arises when agents can pursue their own goals, such as higher pay, an easier life or empire building, at the principals' expense, helped by information asymmetry.

How does corporate governance reduce agency problems?

Through independent non-executive directors, audit committees, external audit, pay linked to long-term performance, transparent reporting and active shareholder engagement.