---
title: "Monopsonistic Labor Market — AP Micro Definition & Exam Guide"
description: "A monopsonistic labor market has one buyer of labor, so MFC exceeds the wage. Learn why the monopsonist hires fewer workers and how a minimum wage can raise jobs."
canonical: "https://fiveable.me/ap-micro/key-terms/monopsonistic-labor-market"
type: "key-term"
subject: "AP Microeconomics"
unit: "Unit 5"
---

# Monopsonistic Labor Market — AP Micro Definition & Exam Guide

## Definition

A monopsonistic labor market is one where a single firm is the only buyer of labor, so it faces the upward-sloping market supply curve, making marginal factor cost greater than the wage and leading it to hire fewer workers at a lower wage than a competitive market would.

## What It Is

A monopsonistic labor market flips [monopoly](/ap-micro/key-terms/monopoly "fv-autolink") on its head. Instead of one seller of a product, there's one buyer of labor. Think of a remote town with a single hospital hiring nurses or one mine employing the whole region. Because the firm IS the market [demand](/ap-micro/unit-2/demand/study-guide/225JkWV3Tu5Hq3oyAChc "fv-autolink") for workers, it faces the entire upward-sloping labor supply curve. To hire one more worker, it has to raise the wage, and (assuming it pays everyone the same) it has to raise the wage for every worker it already employs too.

That's why marginal factor cost (MFC) is greater than the wage. The [cost](/ap-micro/unit-3/production-function/study-guide/euPM8nkZyHZuiKhQJFye "fv-autolink") of hiring worker number 11 isn't just that worker's wage. It's that wage plus the raise given to the first 10 workers (EK PRD-4.D.1 and PRD-4.D.2). On the graph, the MFC curve sits above the labor supply curve. The monopsonist hires where MRP = MFC, then drops down to the supply curve to set the wage. The result is fewer workers hired and a lower wage than in a perfectly competitive labor market, with the wage gap between MRP and the actual wage representing the firm's exploitation of its buying power.

## Why It Matters

This is the heart of Topic 5.4 (Monopsony Markets) in [Unit 5](/ap-micro/unit-5 "fv-autolink"): Factor Markets. Learning objective 5.4.A asks you to define monopsony's characteristics using graphs, 5.4.B asks you to explain the profit-maximizing hiring rule (hire while MRP > MFC), and 5.4.C asks you to calculate MFC, the profit-maximizing quantity of labor, and the wage from a graph or table. The monopsony graph is one of the trickiest in [AP Micro](/ap-micro "fv-autolink") because the firm picks quantity on one curve (where MRP = MFC) and price on a different curve (the supply curve below it). It also sets up the most counterintuitive result on the exam, which is that a well-placed minimum wage can actually increase employment in a monopsony.

## Connections

### [Marginal Factor Cost (Unit 5)](/ap-micro/key-terms/marginal-factor-cost)

MFC is the engine of the whole monopsony model. In a competitive [labor market](/ap-micro/key-terms/labor-market "fv-autolink"), MFC equals the wage, so the two curves overlap. In a monopsony, raising the wage for new hires means raising it for everyone, so MFC rises faster than the supply curve and sits above it.

### [Monopoly (Unit 4)](/ap-micro/key-terms/monopoly)

Monopsony is the mirror image of monopoly. A [monopolist](/ap-micro/key-terms/monopolist "fv-autolink")'s marginal revenue lies below its demand curve because lowering price affects all units sold; a monopsonist's MFC lies above its supply curve because raising the wage affects all workers hired. Same logic, opposite side of the market.

### Price Floor / Minimum Wage (Units 2 and 5)

In a [competitive market](/ap-micro/key-terms/competitive-market "fv-autolink"), a binding minimum wage causes unemployment. In a monopsony, a minimum wage set between the monopsony wage and the competitive wage flattens the MFC curve and can raise BOTH wages and employment. This reversal is a favorite exam twist.

### [Supply of Labor (Unit 5)](/ap-micro/key-terms/supply-of-labor)

The whole model rests on the firm facing the upward-sloping market labor supply curve instead of a flat one. The supply curve tells you the wage workers require at each quantity, which is where the monopsonist goes to set pay after choosing how many to hire.

## On the AP Exam

Expect graph-based questions. You'll see a labor market diagram with three curves (MRP/demand, supply, and MFC above supply) and need to identify the monopsony quantity (where MRP = MFC) and the monopsony wage (read down to the supply curve, not the intersection). Table-based versions ask you to calculate MFC from total labor cost data and find where MFC first exceeds MRP. Practice questions also test policy scenarios, like how a minimum wage (price floor) set above the monopsony wage affects employment, how a hiring subsidy changes the marginal expense of labor and worker welfare, and what happens when new firms enter and erode the monopsonist's wage-setting power (employment and wages both rise toward competitive levels). No released FRQ has used the term verbatim in this form, but Unit 5 factor market graphs are standard FRQ material, and the monopsony graph is exactly the kind of draw-label-and-explain task FRQs reward.

## monopsonistic labor market vs Monopoly

A monopoly is a single SELLER of a good; a monopsony is a single BUYER of an input, usually labor. A monopolist restricts output to charge a higher price. A monopsonist restricts hiring to pay a lower wage. Easy memory hook: monopoly squeezes consumers, monopsony squeezes workers. On graphs, the monopolist's MR curve lies below demand, while the monopsonist's MFC curve lies above supply.

## Key Takeaways

- A monopsonistic labor market has one buyer of labor, so the firm faces the upward-sloping market labor supply curve instead of a flat wage line.
- Marginal factor cost exceeds the wage because hiring one more worker means paying that worker's wage plus a raise to all existing workers.
- The monopsonist hires where MRP = MFC, but pays the lower wage found on the supply curve at that quantity, never the wage at the intersection.
- Compared to a perfectly competitive labor market, a monopsony hires fewer workers and pays a lower wage.
- A minimum wage set above the monopsony wage but at or below the competitive wage can increase both employment and wages, which is the opposite of the competitive-market result.
- If new firms enter the labor market, the monopsonist's wage-setting power erodes and wages and employment move toward competitive levels.

## FAQs

### What is a monopsonistic labor market in AP Micro?

It's a labor market with a single employer buying labor, like a one-company town. Because the firm faces the whole upward-sloping labor supply curve, its marginal factor cost exceeds the wage, so it hires where MRP = MFC and pays a wage below MRP.

### Does a minimum wage always cause unemployment in a monopsony?

No. If the minimum wage is set above the monopsony wage but at or below the competitive wage, it can actually increase employment, because it flattens the MFC curve and removes the firm's incentive to restrict hiring. Set it too high, though, and unemployment returns.

### How is a monopsony different from a monopoly?

A monopoly is one seller of a product; a monopsony is one buyer of an input. The monopolist restricts output to raise the product price, while the monopsonist restricts hiring to lower the wage. Their graphs mirror each other, with MR below demand for monopoly and MFC above supply for monopsony.

### Why is marginal factor cost greater than the wage in a monopsony?

To attract one more worker, the firm must raise the wage, and it pays that higher wage to all existing workers too. So the cost of the new hire is their wage plus everyone else's raise, which is exactly what EK PRD-4.D.1 spells out.

### How do I find the wage on a monopsony graph?

First find the quantity where MRP intersects MFC, then drop straight down to the labor SUPPLY curve and read the wage there. The most common exam mistake is reading the wage at the MRP-MFC intersection, which overstates what the firm actually pays.

## Related Study Guides

- [5.4 Monopsony Markets](/ap-micro/unit-5/monopsonistic-markets/study-guide/0xBQAaC4q2GeMFvurLsg)

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