What it means
Two conditions have to be present. First, the interests of the two parties must diverge at least partly; second, the principal must be unable to observe everything the agent does.
Remove either condition and the problem disappears. The classic business version is shareholders and executives.
Shareholders want long-run value, while a chief executive may prefer a bigger empire, a quieter life or a bonus that pays out this year, and the shareholders cannot sit in every meeting to judge which motive is driving a decision. It shows up far beyond the boardroom.
A landlord and a letting agent, a client and a law firm billing by the hour, a sales manager and a commission-only representative, a government and an outsourced contractor: each pairing has the same structure. The standard responses fall into three groups: monitoring, incentives and information.
Monitoring means audits, reporting and board oversight; incentives mean tying the agent's pay to the principal's outcome through share options or performance fees; information means contracts that force disclosure. None of these fixes is free, and none is complete.
Every monitoring dollar spent and every incentive scheme designed is itself a cost, and some misalignment always survives, which is why the honest framing is minimising agency cost rather than eliminating it.
In practice
Real-world examples
Example 1
A private equity owner installs a chief executive at a packaging business and pays a fixed salary with no equity. The chief executive delays a disruptive but valuable factory reorganisation because the upheaval would make his next two years unpleasant. The owner responds by rewriting the package so that 40% of pay depends on the eventual sale valuation.
Example 2
A homeowner hires a letting agent paid a percentage of rent collected. The agent accepts the first applicant rather than holding out three weeks for a stronger tenant, because the agent's fee barely changes while the empty period costs the owner directly.
Example 3
A software company pays its enterprise sales team commission on signed contract value with no clawback. Representatives push customers into three year deals with heavy first year discounts, which maximises commission today and damages renewal economics later. Finance replaces the scheme with one based on gross margin and a twelve month clawback.
Think of it
Imagine hiring a dog walker and paying them per hour. You want your dog to get vigorous exercise, but since you are not watching, the walker might just sit on a park bench and scroll through their phone while your dog sits beside them, because both options pay the same wage.
Formula
Calculation
Agency cost = monitoring costs + bonding costs + residual loss.
Consider an investor group that owns a chain of fitness studios run by a hired management team. Independent audits, a non-executive board and monthly reporting cost $250,000 a year, which is the monitoring element. The management team accepts a contract requiring it to hold shares it cannot sell for three years, and administering and insuring that arrangement costs $90,000, which is the bonding element. Even so, the owners estimate that discretionary spending they would never have approved, such as an over-specified head office fit-out, destroys $400,000 of value a year, which is the residual loss. Total agency cost is $250,000 + $90,000 + $400,000 = $740,000. Measured against the $7,400,000 of profit the business would make under perfect alignment, the principal-agent problem is costing exactly 10% of the prize.Case study
Seen in the real world
Vantage Harbour Freight is an illustrative, fictional shipping agency owned by a group of passive investors and run by a hired management team. For four years the business grew revenue steadily while profit barely moved, and the owners could not work out why.
An external review found the pattern quickly. Managers were rewarded on revenue growth, so they chased low-margin bulk contracts, kept two underused depots open because closing them would shrink the operation they were measured on, and specified a $900,000 office refurbishment that no owner would have approved. Monitoring was thin: one board meeting a quarter and a management pack written by the very team being assessed.
The owners changed three things. They moved half of the bonus onto return on capital employed, appointed an independent chair with authority over capital spending above $100,000, and required a monthly pack prepared by finance rather than by the managers under review. Monitoring costs rose by about $180,000 a year, which the owners treated as a price worth paying. The company is fictional, but the sequence of symptoms, diagnosis and partial fix is a very familiar one.
Watch out
Common mistakes
- Assuming the problem requires dishonesty. Most agency cost comes from ordinary people responding rationally to the incentives they were actually given.
- Believing share options fully align managers and shareholders. Options reward upside without exposing the holder to downside, which can encourage more risk than owners want.
- Trying to monitor the problem away. Beyond a point, the cost of extra oversight exceeds the value of the behaviour it corrects.
Questions
People also ask
Is the principal-agent problem only about executives and shareholders?
No, it appears wherever one party acts for another under imperfect observation, including clients and advisers, employers and staff, and governments and contractors.
What is residual loss?
It is the value still lost after monitoring and incentives have done their work, and it is the part of agency cost that cannot be designed away.
How does information asymmetry relate to this?
Information asymmetry, where the agent knows more than the principal, is the condition that makes the problem possible in the first place.