Supply, Demand, and Government Policies: Price Controls and Tax Incidence

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Supply, Demand, and Government Policies

Introduction

This chapter explores how government interventions such as price ceilings, price floors, and taxes affect market outcomes. These policies are often implemented to address perceived unfairness or to help specific groups, but they can have unintended consequences on the allocation of resources in competitive markets.

Government Policies in Markets

Economists as Policy Analysts and Advisers

Economists use theories to analyze and influence real-world policy decisions.
Policies often have effects that their creators did not intend or anticipate.
Government interventions can alter private market outcomes through mechanisms such as price controls and taxes.

Price Controls

Definitions

Price Ceiling: A legal maximum on the price at which a good or service can be sold. Example: Rent-control laws.
Price Floor: A legal minimum on the price at which a good or service can be sold. Example: Minimum wage laws.

Effects of Price Ceilings

If set above equilibrium price: Not binding (no effect on market outcome).
If set below equilibrium price: Binding (causes a shortage).

Example: In the market for apartments, a price ceiling below the equilibrium price leads to a shortage, as the quantity demanded exceeds the quantity supplied.

Short-Run vs. Long-Run Effects

Short run: Shortage arises, but may be limited.
Long run: Both supply and demand become more elastic, making the shortage larger.

How Price Ceilings Affect Market Outcomes

Shortages force sellers to ration goods among buyers.
Rationing mechanisms include long lines (inefficient) and seller bias (unfair).

Active Learning Example: Price Ceilings for Muffins

Price ceiling set above equilibrium: Not binding, no effect.
Price ceiling set below equilibrium: Binding, causes shortage (quantity demanded exceeds quantity supplied).

Effects of Price Floors

If set below equilibrium price: Not binding (no effect on market outcome).
If set above equilibrium price: Binding (causes a surplus).

Example: In the labor market, a minimum wage above the equilibrium wage causes a surplus of labor (unemployment).

How Price Floors Affect Market Outcomes

Binding price floors create surpluses.
Undesirable rationing mechanisms may arise, such as sellers appealing to buyers' biases.

Active Learning Example: Price Floors for Muffins

Price floor set below equilibrium: Not binding, no effect.
Price floor set above equilibrium: Binding, causes surplus (quantity supplied exceeds quantity demanded).

Case Study: The Minimum Wage

Key Points

Minimum-wage laws set the lowest legal price for labor.
Federal minimum wage in the U.S. (2021): $7.25/hour; some states/cities set higher minimums.
European minimum wages are generally higher than in the U.S.

Impact on Teenage Labor Market

Teenagers are the least skilled and least experienced workers.
Minimum wage increases reduce teenage employment (a 10% increase may decrease employment by 1-3%).
Long-run effects are harder to estimate but likely larger, including more teenagers seeking jobs, displaced workers, and new dropouts.

Debate Over Minimum Wage

Advocates: Argue it raises income for the working poor and has small adverse effects.
Opponents: Argue it causes unemployment, is poorly targeted, and many minimum-wage earners are not from poor families.

Evaluating Price Controls

Markets usually organize economic activity efficiently.
Economists often oppose price controls because prices balance supply and demand.
Governments may use price controls to help the poor, but these often hurt those they intend to help.
Alternative policies: Rent subsidies, wage subsidies (earned income tax credit).

Taxes and Market Outcomes

Tax Incidence

Tax incidence: The manner in which the burden of a tax is shared among market participants.
Government can legally impose taxes on buyers or sellers, but the economic outcome is the same.

Effects of a Tax

A tax on buyers shifts the demand curve downward by the amount of the tax.
A tax on sellers shifts the supply curve upward by the amount of the tax.
In both cases, the equilibrium quantity falls, buyers pay more, and sellers receive less.

Mathematical Representation

The difference between the price buyers pay () and the price sellers receive () equals the tax:

Who Bears the Burden?

The side of the market that is less elastic (less responsive to price changes) bears more of the tax burden.
If demand is inelastic and supply is elastic, buyers bear most of the tax.
If supply is inelastic and demand is elastic, sellers bear most of the tax.

Example: The Market for Pizza

Without tax: Equilibrium price $10, quantity 500.
With a $1.50 tax on buyers or sellers: New equilibrium price for buyers $11, for sellers $9.50, quantity 450.
Tax incidence: Buyers pay $1 more, sellers receive $0.50 less.

Summary Table: Effects of Price Controls and Taxes

Policy	Binding Condition	Market Effect	Example
Price Ceiling	Below equilibrium price	Shortage	Rent control
Price Floor	Above equilibrium price	Surplus	Minimum wage
Tax	Imposed on buyers or sellers	Quantity falls, wedge between and	Sales tax, excise tax

Chapter in a Nutshell

A price ceiling is a legal maximum; binding if below equilibrium, causing a shortage.
A price floor is a legal minimum; binding if above equilibrium, causing a surplus.
Taxes reduce market quantity and create a wedge between what buyers pay and sellers receive.
The incidence of a tax depends on the relative elasticities of supply and demand; the less elastic side bears more of the burden.