Factor Markets and Derived Demand
This topic tests labor demand, labor supply, marginal product, marginal revenue product, marginal factor cost, wage determination, and input hiring.
How to study for AP Microeconomics
Build every answer from marginal analysis first: identify the market, draw the correct graph, compare private and social incentives, and explain the economic mechanism.
Core concepts
Concept 1
Factor-market questions connect output markets to input demand.
Exam cue: Compute MRP before deciding how many workers to hire.
Concept 2
Input hiring follows marginal revenue product and marginal factor cost.
Exam cue: Ask whether the firm is a wage taker or has monopsony power.
Concept 3
Market power in labor markets changes wages, employment, and efficiency.
Exam cue: Connect output price changes to labor demand shifts.
Risk pitfalls and guardrails
Using marginal product when marginal revenue product is required.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Ignoring output demand when labor demand shifts.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Confusing wage with marginal factor cost in monopsony.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Memory anchors
Derived Demand
Demand for an input is derived from demand for the output it helps produce.
Marginal Revenue Product
Marginal revenue product is marginal product times marginal revenue.
Marginal Factor Cost
Marginal factor cost is the extra cost of hiring one more input unit.
Labor Demand
Labor demand reflects the marginal revenue product of labor.
Labor Supply
Labor supply shows workers willing and able to work at each wage.
Input Hiring Rule
Hire input units until marginal revenue product equals marginal factor cost.
Least-Cost Rule
The least-cost input mix equalizes marginal product per dollar across inputs.
Monopsony
A monopsony is a labor market with a single dominant buyer of labor.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
The demand for a factor of production, such as labor, is called a derived demand because it:
In the theory of factor markets, the marginal revenue product (MRP) of labor is the:
Answer all questions to submit.
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