Labor demand is the quantity of labor firms are willing and able to hire at each wage rate; in AP Micro it's a derived demand that comes from the demand for the product workers make, and the curve shifts when the output price or worker productivity changes (EK PRD-4.B.1).
Labor demand is the relationship between the wage rate and the quantity of workers firms want to hire. It slopes downward like any demand curve. As wages rise, hiring an extra worker costs more, so firms hire fewer of them.
The big idea that makes labor demand different from regular demand is that it's derived demand. Firms don't want workers for their own sake; they want what workers produce. So labor demand comes from two things multiplied together, how much output each worker adds (the marginal product of labor) and how much that output sells for (the output price). The CED is explicit about this in EK PRD-4.B.1. A change in the output price or in worker productivity shifts the entire labor demand curve. A change in the wage itself does NOT shift the curve. It just moves you along it to a different quantity of labor demanded.
Labor demand lives in Topic 5.2 (Changes in Factor Demand and Factor Supply) inside Unit 5: Factor Markets, supporting learning objective 5.2.A, which asks you to explain (with graphs) how firms respond to changes in incentives and constraints. The enduring understanding behind it is that factor prices, like wages, send signals to firms and workers. When labor demand shifts, the equilibrium wage and employment level both change, and you need to predict the direction of both. This is the demand half of every labor market graph you'll draw in Unit 5, so if you can't tell a shift in labor demand from a movement along it, the whole unit gets shaky.
Keep studying AP Microeconomics Unit 5
Marginal Product of Labor (Unit 5)
The labor demand curve is basically the marginal revenue product curve, which is MPL times the output price. When a question says "workers get new training" or "a new machine makes workers more productive," MPL rises, so labor demand shifts right.
Labor Supply (Unit 5)
Labor demand only tells half the story. Wage and employment are set where labor demand crosses labor supply, and the CED gives each curve its own separate shifters (output price and productivity for demand; immigration, education, and preferences for supply). Keep the two lists apart.
Product Market Demand (Unit 2)
Because labor demand is derived demand, anything from Unit 2 that raises the price of the product feeds straight into Unit 5. If consumers suddenly love pizza, pizza prices rise, and pizza makers become more valuable to hire. Demand for pizza workers shifts right.
Wage Rate (Unit 5)
The wage is to the labor market what price is to the product market. A wage change causes a movement along the labor demand curve, never a shift of it, which is the single most-tested distinction in factor markets.
Labor demand shows up mostly in graph-based questions. MCQs give you a scenario (output price rises, productivity falls, new technology, a wage increase) and ask whether labor demand shifts or whether you just move along the curve, then ask what happens to equilibrium wage and quantity of labor. Practice questions also test elasticity of labor demand. If workers are easily replaced by machines or other inputs, demand is elastic and a wage change causes a big drop in hiring; if skilled workers have few substitutes, demand is inelastic and firms keep hiring even at higher wages. You should also be ready to explain shortages, which happen when the wage sits below equilibrium so quantity of labor demanded exceeds quantity supplied. No released FRQ has used the phrase "labor demand" verbatim, but factor market FRQs regularly ask you to draw a labor market graph, shift one curve, and explain the new wage and employment level, which is exactly this skill.
A change in labor demand shifts the whole curve and is caused by a determinant like output price or productivity (EK PRD-4.B.1). A change in quantity of labor demanded is a movement along a fixed curve, caused only by a change in the wage rate. If an MCQ says "the wage rises," do not shift the labor demand curve. Slide up along it instead.
Labor demand is derived demand, meaning firms hire workers because of the demand for the product those workers produce.
Only two determinants shift the labor demand curve in the CED, the price of the output and the productivity of workers (EK PRD-4.B.1).
A change in the wage rate moves you along the labor demand curve; it never shifts the curve itself.
An increase in labor demand raises both the equilibrium wage and the equilibrium quantity of labor hired.
When inputs are easily substitutable, labor demand is elastic, so a wage increase causes a large drop in hiring; with few substitutes, demand is inelastic and hiring barely falls.
A labor shortage occurs when the wage is below equilibrium, so the quantity of labor demanded exceeds the quantity of labor supplied.
Labor demand is the quantity of workers firms are willing and able to hire at each wage rate. It's derived demand, built from the marginal product of labor times the output price, and it's tested in Topic 5.2 of Unit 5 (Factor Markets).
No. A wage change causes a movement along the labor demand curve (a change in quantity of labor demanded), not a shift. Only changes in output price or worker productivity shift the curve, per EK PRD-4.B.1.
Labor demand comes from firms deciding how many workers to hire, and it shifts with output price and productivity. Labor supply comes from workers deciding whether to work, and it shifts with things like immigration, education, working conditions, and preferences for leisure. Each curve has its own separate shifter list.
The CED names two determinants, the price of the output the workers produce and the productivity of the workers. New technology that raises MPL or higher product prices shift labor demand right; falling product prices or lower productivity shift it left.
Both the equilibrium wage and the equilibrium quantity of labor rise. On the graph, the labor demand curve shifts right along an upward-sloping labor supply curve, so firms hire more workers at a higher wage.