supply, demand, and government policies
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SUPPLY, DEMAND, AND GOVERNMENT POLICIES. Overview. Economists have two roles: As scientists, they develop and test theories to explain the world around them. As policy advisers, they use their theories to help change the world for the better - PowerPoint PPT PresentationTRANSCRIPT
SUPPLY, DEMAND, AND GOVERNMENT POLICIES
Overview
Economists have two roles:
1. As scientists, they develop and test theories to explain the world around them.
2. As policy advisers, they use their theories to help change the world for the better
Up to this point, we have focused on the role of economists as scientists.
Now we turn to the role of economists as policy advisers
Overview
• In unregulated markets, the market forces of supply and demand determine market prices and quantities.
• Price controls are enacted by the government when it is believed that market prices are unfair to either sellers or consumers.
• Demand and supply analysis can be used to examine the impact of government intervention (such as price controls) in markets.
Price Controls
• Price Ceiling: A maximum legal price above which a good can not be sold.
– Examples: Rent Control, Price Controls on Gas in 1970’s.
• Price Floor: A minimum legal price below which a good can not be sold.
– Examples: Minimum wages, agriculture price supports.
Price Ceilings
Two outcomes are possible when the government imposes a price ceiling:
1. The price ceiling is not binding if set above the equilibrium price.
2. The price ceiling is binding if set below the equilibrium price, leading to a shortage.
A Nonbinding Price CeilingPrice
Quantity
D1
S1
A price ceiling set above the equilibrium price has no effect!
P1
Q1
Maximum Price Allowed by Law
P Max
A Binding Price CeilingPrice
Quantity
D1
S1
P1
Q1
Maximum Price Allowed by Law
P Max
A price ceiling set below the equilibrium price leads to a shortage or excess demand
(QD > QS).
QDQS
Application: OPEC and Lines at Gas Stations in the 1970’s
• In 1973, OPEC raised the price of crude oil in world markets. Crude oil is the major input in gasoline, so the higher oil prices reduced the supply of gasoline. As a result, the price of gasoline rose sharply.
• In response the government placed a price ceiling on gasoline.
• The results was very long lines at gas stations.
Market for Gas Prior to OPEC Oil ShockPrice
Quantity of Gasoline
D1
S1
Prior to the OPEC oil shock, the price ceiling is nonbinding.
P1
Q1
Maximum Price Allowed by Law
P Max
Market for Gas After OPEC Oil ShockPrice
Quantity of Gasoline
D1
S1
P1
Q1
Maximum Price Allowed by Law
P Max
S2
QDQS
The oil shock causes the supply curve for gas to shift left. Now the price ceiling is binding and a shortage of gas results (QD>QS)
Application:The Market for Low-Income Housing
• Background: Rental rates and housing prices in the New Haven Area increased substantially over the last five years. As a result, it has become much more difficult for low-income families to find affordable housing.
• Policy Issue: Suppose you were hired by the Mayor of New Haven to devise an affordable housing strategy for low income families. You are asked to come up with three policy options.
• Policy Options:
• .
• .
• .
Application:The Market for Low-Income Housing
Housing Vouchers for Low-Income Families
Rental Rate
Number of Apartments
S1
Initialequilibrium
A voucher represents an increase in income:
P1
Q1
New equilibriumP2
Q2
D2
D1
A Per-Unit Rent Subsidy for Landlords
Rental Rate
0Number of Apartments
D1
Initial equilibrium
S1
P1
Q1
S2
P2
Q2
New equilibrium
The subsidy causes the supply curve for apartments to shift right, leading to a lower equilibrium price and a higher equilibrium quantity.
Rent Control: Maximum Rent Set Above Equilibrium Price
Rental Rate
Number of Apartments
D1
Equilibrium
S1
A price ceiling set above the equilibrium price has no effect!
P1
Q1
Maximum Rent by Law
P Max
Rent Control: Maximum Rent Set Below Equilibrium Price
Rental Rate
0Number of Apartments
D1
Equilibrium
S1
A price ceiling set below the equilibrium price leads to excess demand.
P1
Q1
Maximum Rent by Law
P Max
QDQS
Consequences of Rent Control
• Tends to reduce the quantity and quality of housing available.
• Tends to bid up rents in uncontrolled sector.
• No incentive to invest in new rental units.
• Creates a black market for apartments.
• In his study, “Who Really Benefits from New York City’s Rent Regulation System?,” Henry Pollakowski concludes: “This study finds that tenants in low- and moderate-income areas receive little or no benefit from rent stabilization, while tenants in more affluent locations are effectively subsidized for a substantial portion of their rent.”
• Also see article by Walter Block on rent control.
Price Floors
When the government imposes a price floor, two outcomes are possible.
1. The price floor is not binding if set below the equilibrium price.
2. The price floor is binding if set above the equilibrium price, leading to a surplus.
A Nonbinding Price Floor
Price
0Quantity
Demand
Equilibrium
Supply
A price floor set below the equilibrium price has no effect.
p1
Q1
Minimum price allowed by Law
p min
A Binding Price Floorprice
0Quantity
Demand
Supply
A price floor set above the equilibrium price resultsin a surplus
P1
Q1
Minimum Price Allowed by Law
P min
QD QS
Excess Supply
Minimum Wage Laws and the Unemployment Rate
An important policy question is: Does an increase in the minimum wage cause an increase in the unemployment rate of low-skilled workers?
Minimum Wage Laws and the Unemployment Rate
wage rate
0Employment
Demand for labor
Equilibrium
Supply of labor
A minimum wage set below the equilibrium wage has no effect.
w1
L1
Minimum wage by Law
w min
Minimum Wage Laws and Unemployment
wage rate
Employment
Demand for Labor
Supply of Labor
A minimum wage set above the equilibrium wage results in unemployment
w1
L1
Minimum wage by Law
w min
LD LS
Unemployment
Minimum Wage Laws and the Unemployment Rate
Overview of Taxation
• Governments levy taxes to raise revenue for public projects.
• Facts about Taxation:
– Taxes discourage market activity.
– When a good is taxed, the quantity sold is smaller.
– Buyers and sellers share the tax burden.
Tax Incidence
• Renters never receive a property tax bill in the mail.
– Does that imply renters pay no property taxes?
• Social Security if financed with a flat tax on earnings. The payroll tax is split equally between employer and employee, with each paying 6.2% of gross wages.
– Does that fact imply employers and employees bear equal burdens of the Social Security tax?
• To answer those questions we need to distinguish between the statutory incidence and economic incidence of a tax.
Tax Incidence
• Statutory Incidence: refers to who is legally responsible for paying the tax.
• Economic Incidence: refers to who bears the burden of a tax. It is the change in the distribution of real private income induced by the tax.
• Tax Shifting: refers to the extent to which the statutory incidence and economic incidence of a tax differ.
A Per-Unit Tax Imposed on Suppliers
Quantity
Price
D1
S1
PD
PS
P1
Q1Qtax
S2
Per-Unit tax paid by Suppliers shifts the supply
curve to the left
Per-Unit Tax
A Per-Unit Tax Imposed on Consumers
Quantity
Price
D1
S1
PD
PS
P1
Q1Qtax
Per-Unit tax paid by Consumers shifts the
demand curve to the left
D1
Per-Unit Tax
Tax Incidence
• Taxes on buyers and sellers are equivalent
• That is, the economic incidence of a tax is independent of the statutory incidence
• Because of that fact it is useful to illustrate the impact of taxes using a tax wedge, rather than shifting either the supply or demand curve.
Tax Incidence and Tax Wedges
Quantity
Price
D1
S1
PD
PS
P1
Q1
A per-unit tax drives a wedge between the price
paid by consumers and the price received by suppliers
Tax Wedge
QTax
Elasticity and Tax Incidence
• The burden of a tax is usually shared by producers and consumers.
• The degree to which the tax is shared depends critically on the elasticity of supply and demand.
• Thus, the economic incidence of a tax depends on the relative elasticity of supply and demand.
– If demand is relatively more elastic than supply, suppliers end up bearing more of the burden of a tax.
– If supply is relatively more elastic than demand, consumers end up bearing more of the burden of a tax.
Tax Incidence when Supply is More Elastic than Demand
Packs of Cigarettes
$/Pack
D
S
PD
PS
P1
Q1Qtax
When supply is more elastic than demand, consumers bear the burden of the tax
Tax Incidence when Demand is More Elastic Than Supply
Quantity of Luxury Boats
Price
D
S
PD
PS
P1
Q1Qtax
When demand is more elastic than supply, producers bear the burden of the tax
Application: The Payroll Tax
• The federal government uses the FICA (Federal Insurance Contribution Act) to finance Social Security and Medicare.
• FICA is a payroll tax since it is deducted directly from your paycheck.
• Currently the payroll tax is 15.3% of earnings.
• According to law, the statutory incidence of the payroll tax is split between workers and employers. Each pays 7.65% of earnings.
• Who bears the burden of the payroll tax?
• Hint: Economists estimate that the supply of labor is much less elastic than the demand for labor.
The Economic Incidence of the Payroll Tax
Quantity of Labor
wage
Demand for Labor
Supply of Labor
wD
wS
w1
L1L2
Because the supply of labor is less elastic than the demand for labor, workers end up paying most of the payroll tax.
Payroll Tax