---
title: "Principal-Agent Model | Principles of Economics"
description: "Principal-Agent Model explains how delegated work can go off track when incentives and information differ, a core idea in Principles of Economics."
canonical: "https://fiveable.me/principles-econ/key-terms/principal-agent-model"
type: "key-term"
subject: "Principles of Economics"
unit: "Unit 16"
---

# Principal-Agent Model | Principles of Economics

## Definition

The principal-agent model is an economics framework for situations where one person or group delegates work to another. It shows how different incentives and unequal information can cause the agent to act differently than the principal wants.

## What It Is

The principal-agent model is a Principles of Economics framework for any situation where a principal hires, appoints, or relies on an agent to do something on their behalf. The principal is the side that wants a task done, while the agent is the side carrying it out.

The whole point of the model is that the two sides usually do not have identical goals. A business owner may want lower costs and higher long-run profit, while a manager may care more about salary, convenience, or avoiding extra effort. A lender wants a borrower to repay the loan, but the borrower may prefer to take on more risk once the money is already in hand.

The model matters because the agent often knows more about their own effort, actions, or intentions than the principal does. That information gap is called information asymmetry. Once that gap exists, the agent may have room to shirk, take hidden risks, or choose actions that are good for them but costly for the principal.

Economists use this model to explain moral hazard and adverse selection. Moral hazard shows up after the relationship starts, when the agent changes behavior because someone else bears part of the cost. Adverse selection shows up before the relationship starts, when the principal cannot easily tell which agents are high quality, low risk, or trustworthy.

A simple example is an employer and employee. If a worker is paid a flat salary with little supervision, the worker may not put in full effort because the employer cannot watch every minute. To reduce that problem, the employer might add commissions, bonuses, performance reviews, or monitoring systems. These are all ways of trying to line up the agent’s choices with the principal’s goals.

You can also think of the model in government, finance, and contracts. Shareholders are principals, executives are agents, and voters are principals, while elected officials are agents. The exact setting changes, but the logic stays the same: delegated power creates a tradeoff between trust, incentives, and control.

## Why It Matters

Principal-agent model is one of the main tools economists use to explain why real markets do not always work like the clean versions in graphs. It shows why contracts, oversight, and incentives exist in the first place instead of assuming people automatically do what the other side wants.

In Principles of Economics, this term shows up whenever a market depends on someone acting for someone else. That includes workers and managers, shareholders and CEOs, insurance companies and policyholders, and borrowers and lenders. If you can spot who has more information and who bears the risk, you can usually predict where the conflict will show up.

It also connects directly to why firms design pay packages the way they do. Salaries, commissions, bonuses, quotas, and monitoring are all responses to the principal-agent problem. Without this framework, those business decisions can look random. With it, they make more sense as attempts to reduce hidden action and align incentives.

The model also helps you read policy debates. A regulation, reporting rule, or audit requirement often exists because one side cannot fully observe what the other side is doing. That makes the principal-agent model a useful way to explain both private business behavior and public policy choices.

## Connections

### [Moral Hazard](/principles-econ/key-terms/moral-hazard)

Moral hazard is what can happen after the principal-agent relationship is already in place. Once the agent is insulated from the full consequences of their choices, they may take more risks or work less carefully. The principal-agent model is the larger framework, and moral hazard is one common outcome inside it.

### Adverse Selection

Adverse selection happens before the contract or relationship begins, when the principal cannot easily tell who is high quality and who is not. In the principal-agent model, this is the setup problem created by hidden information. It helps explain why screening, interviews, and background checks exist.

### [Contractual Incentives](/principles-econ/key-terms/contractual-incentives)

Contractual incentives are one of the main tools principals use to reduce the gap between what they want and what the agent does. Pay-for-performance, bonuses, commissions, and penalties all try to make the agent’s payoff closer to the principal’s payoff. They matter because monitoring alone is often too expensive or incomplete.

### Information Asymmetry

Information asymmetry is the condition that makes the principal-agent problem possible. If both sides knew the same things and could observe effort perfectly, the conflict would be much smaller. This term helps you see why hidden actions and hidden information keep showing up in economic relationships.

## On the AP Exam

A quiz question may give you a workplace, lending, or insurance scenario and ask who the principal is, who the agent is, and where the incentive conflict comes from. Your job is to point out the hidden information, then explain whether the problem is moral hazard, adverse selection, or both.

On problem sets or in short responses, you may also be asked how a contract could reduce the issue. Look for tools like commissions, bonuses, monitoring, screening, or penalties, and explain why each one changes the agent’s behavior. If a graph or scenario is included, focus on the direction of the incentive problem, not just the definition.

If the question uses a real-world case, connect the term to a concrete decision. For example, a CEO paid mostly through stock may act more like the shareholders want, while a poorly monitored worker may not. Strong answers name the relationship, the information gap, and the mechanism used to fix it.

## Key Takeaways

- The principal-agent model explains what happens when one side delegates work to another side with different goals and more hidden information.
- It is not just about trust, it is about incentives, monitoring, and who bears the costs of a decision.
- Information asymmetry is the reason the problem exists in the first place.
- Moral hazard usually shows up after the relationship starts, while adverse selection shows up before it starts.
- Contracts, bonuses, screening, and supervision are common ways to reduce principal-agent problems.

## FAQs

### What is the principal-agent model in Principles of Economics?

It is a framework for situations where one person or group, the principal, delegates work to another person or group, the agent. Economists use it to study what happens when the agent has more information or different incentives than the principal. That gap can lead to lower effort, hidden risk-taking, or poor choices.

### How is the principal-agent model different from moral hazard?

The principal-agent model is the bigger framework, and moral hazard is one possible problem inside it. Moral hazard happens when the agent changes behavior because someone else is absorbing part of the risk or cost. So if a borrower takes a bigger risk after getting a loan, that is a moral hazard example within a principal-agent setup.

### What is an example of the principal-agent model in economics?

A common example is an employer and employee. The employer wants productive work, but the employee may have more information about how hard they are working than the employer does. That is why firms use performance pay, deadlines, and supervision.

### Why do principals use incentives and monitoring?

They use those tools to narrow the gap between what the agent wants and what the principal wants. Incentives make the agent gain when the principal gains, while monitoring makes hidden actions harder to hide. Both are responses to information asymmetry.

## Related Study Guides

- [16.1 The Problem of Imperfect Information and Asymmetric Information](/principles-econ/unit-16/1-problem-imperfect-information-asymmetric-information/study-guide/Z2TV5EIdcDAcU66r)

## About This Document

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