A floor binds above equilibrium

The legal minimum prevents price from falling enough to clear the market.

A binding floor produces excess supply. Agricultural price supports can create unsold output unless government purchases the surplus or production adjusts. A minimum wage is a price floor in a competitive labor market: workers supply more labor while employers demand less, creating a surplus of labor.

A floor is a legal minimum and binds only above equilibrium. Below equilibrium it does not prevent the market from charging its equilibrium price. At a binding floor, quantity supplied exceeds quantity demanded. In a product market, the smaller quantity demanded limits private sales unless a government or another buyer purchases the excess.

A support price with and without government purchase

At the competitive price of $20, 1,000 units trade. A floor of $26 produces quantity demanded of 820 and quantity supplied of 1,180, a surplus of 360. Without government purchase, only 820 units sell. If government commits to buy the surplus, total production can reach 1,180, but taxpayers finance the 360-unit purchase and any storage or disposal.

This simple model does not claim every affected worker loses. Employed workers who keep their hours receive a higher wage. Some workers may lose jobs or hours. Others may enter the labor force. If the question specifies monopsony, a moderate minimum wage can raise both wage and employment by limiting the buyer’s wage-setting power. Use the stated market structure.

In a competitive labor graph, labor demand comes from employers and slopes downward. Labor supply comes from workers and slopes upward. A binding minimum wage raises quantity of labor supplied and lowers quantity demanded, so unemployment in the model is the difference. Do not label the entire quantity supplied unemployed: some workers are employed at the higher wage.

The monopsony qualification is not a contradiction. A buyer with wage-setting power faces marginal resource cost above labor supply and may hire less than the competitive quantity. A carefully chosen minimum wage can flatten part of the firm’s marginal resource cost and increase hiring. The market structure changes the relevant curves, so an answer that mechanically predicts lower employment may be wrong when monopsony is stated.

Floors can also change quality or composition. Employers unable to lower wages may raise hiring standards or substitute capital for labor. Agricultural sellers may increase quality if buyers choose among surplus output, or reduce it if government purchases all qualifying units. These margins require stated assumptions. The basic competitive-market result is surplus from a binding floor in a competitive market.

Distinguish the surplus quantity from government spending. The surplus is Q_s-Q_d. If government buys it, expenditure is the floor price times the purchased quantity. Multiplying price by total production instead of the surplus overstates government purchase unless the policy buys all output.

Binding versus merely legal

Equilibrium rent is $1,400. A ceiling of $1,100 binds and creates a shortage. A ceiling of $1,600 does not bind. Landlords may still charge the equilibrium rent. A floor of $1,600 would bind and create a surplus if such a floor applied.