In AP Microeconomics, the minimum wage is a legally mandated price floor in the labor market. Set above equilibrium in a perfectly competitive market, it creates a surplus of labor (unemployment) and deadweight loss, but in a monopsony it can actually increase both the wage and employment.
Minimum wage is the lowest hourly wage employers are legally allowed to pay. In AP Micro terms, it's a price floor applied to the labor market, and everything you learned about price floors in Unit 2 carries over. The 'good' being traded is labor, the 'price' is the wage, workers are the suppliers, and firms are the demanders.
The analysis depends entirely on where the floor sits and what kind of market it's in. A minimum wage set below the equilibrium wage is non-binding and changes nothing. A binding minimum wage (above equilibrium) in a perfectly competitive labor market raises the wage but reduces the quantity of labor demanded while increasing the quantity supplied. The gap between those two quantities is a labor surplus, which in this market means unemployment. Government intervention in an efficient market like this creates deadweight loss. The twist comes in Unit 5. In a monopsony, where one firm is the only buyer of labor, the firm pays a wage below workers' marginal revenue product. A well-placed minimum wage flattens the firm's marginal factor cost curve and can push both the wage and employment up. Same policy, opposite employment result.
Minimum wage is one of the few terms that gets tested in two completely different units with two completely different answers. In Unit 2 (Topic 2.8), it supports AP Micro 2.8.A, 2.8.B, and 2.8.C, where you define price floors, graph their effects, and calculate the resulting surplus, deadweight loss, and changes in consumer and producer surplus. In Unit 5 (Topic 5.4), it connects to AP Micro 5.4.A, 5.4.B, and 5.4.C, where the monopsony graph shows MFC above the labor supply curve and a binding minimum wage can move the market closer to the competitive outcome. If you only know the Unit 2 story ('minimum wage causes unemployment'), you'll miss points on monopsony questions where that conclusion flips.
Keep studying AP Microeconomics Unit 5
Price Floors and Government Intervention (Unit 2)
Minimum wage is the textbook example of a price floor. Everything from Topic 2.8 applies directly, including surplus, deadweight loss, and the rule that a floor only matters if it's set above equilibrium.
Monopsony Markets (Unit 5)
This is where the standard story flips. Because a monopsonist already hires fewer workers at a lower wage than a competitive market would, a minimum wage set between the monopsony wage and the competitive wage raises employment instead of cutting it.
Changes in Factor Demand and Factor Supply (Unit 5)
A minimum wage doesn't shift the labor demand or labor supply curves. It's a movement along both. Shifts come from things like productivity, output prices, immigration, and preferences (Topic 5.2), so don't confuse a wage floor with a curve shifter.
Deadweight Loss (Unit 2)
In a competitive labor market, a binding minimum wage prevents mutually beneficial hires from happening. Those lost transactions show up on the graph as deadweight loss, the same triangle you shade for any binding price control.
Multiple-choice questions almost always test the competitive case, asking how a minimum wage set above equilibrium affects employment (it falls), the wage (it rises), and the labor surplus. Some questions add elasticity, since more elastic labor demand means a bigger drop in employment for the same wage hike. On the FRQ side, the 2025 exam (FRQ Q2) gave a monopsony scenario, a quartz mining firm that is the only employer in town, and asked for profit-maximizing employment and wage from a graph. Minimum wage is a classic follow-up in that setup, because the CED expects you to show how a wage floor changes a monopsonist's hiring. Be ready to (1) draw the labor market with the floor, (2) label the new quantity of labor hired, and (3) compare outcomes with and without the policy in both competitive and monopsony markets.
A minimum wage is a price floor, not a ceiling, even though the word 'minimum' makes some people draw it low on the graph. A floor sets the lowest legal price and only binds when placed ABOVE equilibrium, creating a surplus (here, unemployment). A ceiling sets the highest legal price and only binds when placed BELOW equilibrium, creating a shortage. Quick check before you draw anything. Floors bind above, ceilings bind below.
Minimum wage is a price floor in the labor market, so it only has an effect when it is set above the equilibrium wage.
In a perfectly competitive labor market, a binding minimum wage raises the wage, reduces the quantity of labor demanded, increases the quantity supplied, and creates unemployment and deadweight loss.
In a monopsony, a minimum wage set between the monopsony wage and the competitive wage can increase both the wage and the level of employment.
A minimum wage causes movements along the labor demand and labor supply curves, not shifts of those curves.
The more elastic the demand for labor, the larger the drop in employment caused by the same minimum wage increase.
It's a government-set price floor in the labor market, the lowest wage firms can legally pay. On the AP exam you analyze it with the same tools as any price floor, then re-analyze it in monopsony markets where the result changes.
No. In a perfectly competitive labor market, a binding minimum wage does create a labor surplus (unemployment). But in a monopsony, a minimum wage set between the monopsony wage and the competitive wage actually increases employment. AP Micro tests both cases, so 'always' is a trap answer.
It's a price floor. It sets the lowest legal price for labor, and it only binds when it's above the equilibrium wage. Students mix this up because 'minimum' sounds low, but on the graph an effective minimum wage sits above the intersection of labor supply and labor demand.
Minimum wage is the legal floor set by government regulation. A living wage is the income needed to cover basic living costs, which may be higher than the legal minimum. AP Micro graphs and calculations use the minimum wage; living wage is a policy concept, not a curve on your exam.
Mostly as price floor questions in Unit 2 (effects on employment, surplus, and deadweight loss, sometimes with elasticity) and as monopsony graph analysis in Unit 5. The 2025 FRQ featured a monopsony employer, the exact setup where a minimum wage can raise employment.