5.1 - Introduction to Factor Markets
What are factor markets?
Factor markets are where the inputs needed for production are bought and sold. These inputs, known as factors of production, include labor, capital, and land. Factor markets differ from product markets, where finished goods and services are traded. In factor markets, firms act as buyers, hiring factors to produce goods, while households or owners of factors act as sellers, providing these inputs in exchange for payment.
This setup creates incentives through prices, signaling to both firms and factor owners how to allocate resources efficiently. For example, high demand for a skilled labor type can raise its price, encouraging more people to train in that area.
Key factors of production and factor prices
Factors of production are the resources used to create goods and services. There are three main categories, each associated with a specific type of payment known as a factor price.
Main factors of production
- Labor - Human effort, including physical and mental work provided by workers.
- Capital - Man-made tools, machinery, and buildings used in production.
- Land - Natural resources, such as soil, minerals, and water.
Factor prices
Factor prices are the payments made for using these factors. They respond to market conditions and influence decisions.
They include:
- Wages - Payment for labor, typically an hourly rate or salary.
- Interest - Payment for capital, often as a percentage return on loans or investments.
- Rent - Payment for land, based on its use or location.
These prices provide incentives where higher wages might attract more workers to a job, while high interest could encourage saving to fund capital investments.
The relationship between factors of production, firms, and factor prices
Firms hire factors of production to create output, and their hiring decisions depend on balancing costs and benefits. Factor prices convey information about scarcity and value, guiding firms to use resources where they are most productive.
Firms decide how much of a factor to hire by comparing the additional revenue it generates to its cost. This occurs because factors contribute to productivity—the amount of output produced per unit of input. Higher productivity, combined with strong output prices (the selling price of the final good), justifies paying higher factor prices.
For instance, if a factor like skilled labor increases output significantly and the product sells at a high price, firms will compete to hire it, driving up its factor price. This relationship ensures resources flow to their most valued uses, as shown in factor market graphs where demand curves reflect firms' willingness to pay based on productivity and costs.
Demand and supply in labor markets
Labor markets are a key type of factor market, where firms demand workers and individuals supply their labor. The interactions follow basic economic principles but focus on wages as the price.
Labor demand
The quantity of labor demanded is the amount of workers firms want to hire at different wage rates. It has a negative relationship with wages: as wages rise, firms hire fewer workers because the cost of production increases, making it less profitable. This creates a downward-sloping demand curve in labor market graphs.
Firms base demand on:
- Productivity of labor (how much output each worker adds).
- Output price (higher prices make hiring more worthwhile).
- Cost of the factor (higher wages reduce demand).
Labor supply
The quantity of labor supplied is the amount of work individuals are willing to provide at different wage rates. It has a positive relationship with wages: higher wages encourage more people to work or work longer hours, creating an upward-sloping supply curve in labor market graphs.
Other factors constant, such as worker skills or alternative job options, influence supply. Equilibrium in the labor market occurs where demand equals supply, setting the market wage and employment level.
Marginal revenue product and marginal resource cost
To make precise hiring decisions, firms calculate the additional value and cost of each unit of a factor. This involves two key concepts: marginal revenue product (MRP) and marginal resource cost (MRC).
Marginal revenue product
Marginal revenue product (MRP) is the additional revenue generated by hiring one more unit of a factor. It combines the factor's marginal product (extra output from one more unit) with the marginal revenue (extra income from selling that output).
Formula for marginal revenue product:
Where:
- Marginal product = Additional output from one more unit of the factor
- Marginal revenue = Additional revenue from selling one more unit of output (often the price in competitive markets)
Marginal resource cost
Marginal resource cost (MRC) is the additional cost of hiring one more unit of a factor, often equal to the wage rate in competitive markets.
Formula for marginal resource cost:
In competitive factor markets, MRC often equals the wage rate.
Firms hire until MRP equals MRC, maximizing profits.
Worked example - Calculating marginal revenue product and marginal resource cost
A firm produces widgets and hires workers. The marginal product of the fourth worker is 10 widgets, and each widget sells for $5. The wage rate is $40 per worker. Calculate the MRP for the fourth worker and the MRC if hiring this worker increases total labor costs from $120 to $160.
Step 1: Identify the values
- Marginal product = 10 widgets
- Price per widget (marginal revenue) = $5
- Change in total resource cost = $160 - $120 = $40
- Change in quantity of resource = 1 worker
Step 2: Calculate MRP
Step 3: Calculate MRC
Step 4: Interpretation
Since MRP ($50) exceeds MRC ($40), the firm should hire this worker to increase profits.