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Слайды и текст этой презентации

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6 Supply, Demand, and Government Policies

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Supply, Demand, and Government Policies In a free, unregulated market system, market forces establish equilibrium prices and exchange quantities. While equilibrium conditions may be efficient, it may be true that not everyone is satisfied. One of the roles of economists is to use their theories to assist in the development of policies.

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CONTROLS ON PRICES Are usually enacted when policymakers believe the market price is unfair to buyers or sellers. Result in government-created price ceilings and floors.

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CONTROLS ON PRICES Price Ceiling A legal maximum on the price at which a good can be sold. Price Floor A legal minimum on the price at which a good can be sold.

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How Price Ceilings Affect Market Outcomes Two outcomes are possible when the government imposes a price ceiling: The price ceiling is not binding if set above the equilibrium price. The price ceiling is binding if set below the equilibrium price, leading to a shortage.

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Figure 1 A Market with a Price Ceiling

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Figure 1 A Market with a Price Ceiling

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How Price Ceilings Affect Market Outcomes Effects of Price Ceilings A binding price ceiling creates shortages because QD > QS. Example: Gasoline shortage of the 1970s nonprice rationing Examples: Long lines, discrimination by sellers

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CASE STUDY: Lines at the Gas Pump 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. What was responsible for the long gas lines?

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Figure 2 The Market for Gasoline with a Price Ceiling

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Figure 2 The Market for Gasoline with a Price Ceiling

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CASE STUDY: Rent Control in the Short Run and Long Run Rent controls are ceilings placed on the rents that landlords may charge their tenants. The goal of rent control policy is to help the poor by making housing more affordable. One economist called rent control “the best way to destroy a city, other than bombing.”

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Figure 3 Rent Control in the Short Run and in the Long Run

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Figure 3 Rent Control in the Short Run and in the Long Run

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How Price Floors Affect Market Outcomes When the government imposes a price floor, two outcomes are possible. The price floor is not binding if set below the equilibrium price. The price floor is binding if set above the equilibrium price, leading to a surplus.

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Figure 4 A Market with a Price Floor

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Figure 4 A Market with a Price Floor

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How Price Floors Affect Market Outcomes A price floor prevents supply and demand from moving toward the equilibrium price and quantity. When the market price hits the floor, it can fall no further, and the market price equals the floor price.

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How Price Floors Affect Market Outcomes A binding price floor causes . . . a surplus because QS > QD. nonprice rationing is an alternative mechanism for rationing the good, using discrimination criteria. Examples: The minimum wage, agricultural price supports

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The Minimum Wage An important example of a price floor is the minimum wage. Minimum wage laws dictate the lowest price possible for labor that any employer may pay.

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Figure 5 How the Minimum Wage Affects the Labor Market

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Figure 5 How the Minimum Wage Affects the Labor Market

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TAXES Governments levy taxes to raise revenue for public projects.

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How Taxes on Buyers (and Sellers) Affect Market Outcomes Taxes discourage market activity. When a good is taxed, the quantity sold is smaller. Buyers and sellers share the tax burden.

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Elasticity and Tax Incidence Tax incidence is the manner in which the burden of a tax is shared among participants in a market.

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Elasticity and Tax Incidence Tax incidence is the study of who bears the burden of a tax. Taxes result in a change in market equilibrium. Buyers pay more and sellers receive less, regardless of whom the tax is levied on.

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Figure 6 A Tax on Buyers

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Elasticity and Tax Incidence What was the impact of tax? Taxes discourage market activity. When a good is taxed, the quantity sold is smaller. Buyers and sellers share the tax burden.

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Figure 7 A Tax on Sellers

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Figure 8 A Payroll Tax

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Elasticity and Tax Incidence In what proportions is the burden of the tax divided? How do the effects of taxes on sellers compare to those levied on buyers? The answers to these questions depend on the elasticity of demand and the elasticity of supply.

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Figure 9 How the Burden of a Tax Is Divided

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Figure 9 How the Burden of a Tax Is Divided

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ELASTICITY AND TAX INCIDENCE So, how is the burden of the tax divided? The burden of a tax falls more heavily on the side of the market that is less elastic.

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Summary Price controls include price ceilings and price floors. A price ceiling is a legal maximum on the price of a good or service. An example is rent control. A price floor is a legal minimum on the price of a good or a service. An example is the minimum wage.

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Summary Taxes are used to raise revenue for public purposes. When the government levies a tax on a good, the equilibrium quantity of the good falls. A tax on a good places a wedge between the price paid by buyers and the price received by sellers.

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Summary The incidence of a tax refers to who bears the burden of a tax. The incidence of a tax does not depend on whether the tax is levied on buyers or sellers. The incidence of the tax depends on the price elasticities of supply and demand. The burden tends to fall on the side of the market that is less elastic.