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Consumer and Producer Surplus: Effects of Taxation

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Presentation on theme: "Consumer and Producer Surplus: Effects of Taxation"— Presentation transcript:

1 Consumer and Producer Surplus: Effects of Taxation

2 Welfare Economics Welfare economics shows how the allocation of resources affects economic well-being. Buyers and sellers receive benefits from taking part in the market. The equilibrium in a market maximizes the total welfare of buyers and sellers.

3 CONSUMER SURPLUS Willingness to pay is the maximum amount that a buyer will pay for a good. how much the buyer values the good Consumer surplus is the buyer’s willingness to pay for a good minus the amount the buyer actually pays for it. The area below the demand curve and above the price measures the consumer surplus in the market.

4 How the Price Affects Consumer Surplus
Consumer Surplus at Price P Price A Demand Consumer surplus P1 Q1 B C Quantity Copyright©2003 Southwestern/Thomson Learning

5 How the Price Affects Consumer Surplus
Consumer Surplus at Price P Price A B C Demand Initial consumer surplus Consumer surplus to new consumers P1 Q1 D E F P2 Q2 Additional consumer surplus to initial consumers Quantity Copyright©2003 Southwestern/Thomson Learning

6 PRODUCER SURPLUS Producer surplus is the amount a seller is paid for a good minus the seller’s cost. the benefit to sellers participating in a market. The area below the price and above the supply curve measures the producer surplus in a market.

7 How the Price Affects Producer Surplus
Producer Surplus at Price P Price Supply B A C Q1 P1 Producer surplus Quantity Copyright©2003 Southwestern/Thomson Learning

8 How the Price Affects Producer Surplus
Producer Surplus at Price P Price Additional producer surplus to initial producers Supply D E F P2 Q2 Producer surplus to new producers B P1 C Initial producer surplus A Q1 Quantity Copyright©2003 Southwestern/Thomson Learning

9 MARKET EFFICIENCY Consumer Surplus
= Value to buyers – Amount paid by buyers Producer Surplus = Amount received by sellers – Cost to sellers Total surplus = Consumer surplus + Producer surplus or = Value to buyers – Cost to sellers

10 MARKET EFFICIENCY Efficiency - the property of a resource allocation of maximizing the total surplus received by all members of society. Equity – the fairness of the distribution of well-being among the various buyers and sellers.

11 Consumer and Producer Surplus in the Market Equilibrium
Price A C B D E Demand Consumer surplus Supply Equilibrium price quantity Producer surplus Quantity Copyright©2003 Southwestern/Thomson Learning

12 MARKET EFFICIENCY Three Insights Concerning Market Outcomes
Free markets allocate the supply of goods to the buyers who value them most highly. the demand for goods to the sellers who can produce them at least cost. the quantity of goods that maximizes the sum of consumer and producer surplus.

13 Evaluating the Market Equilibrium
Because the equilibrium outcome is an efficient allocation of resources, the social planner can leave the market outcome as he/she finds it. leaving well enough alone - laissez faire. Market Power If a market system is not perfectly competitive, market power may result. Market power is the ability to influence prices. Market power can cause markets to be inefficient because it keeps price and quantity from the equilibrium of supply and demand.

14 The Effects of a Tax Price Demand Supply Price buyers pay
Price sellers receive Quantity with tax Size of tax Price without tax Quantity Quantity Copyright © South-Western

15 How a Tax Affects Market Participants
A tax places a wedge between the price buyers pay and the price sellers receive. Because of this tax wedge, the quantity sold falls below the level that would be sold without a tax. The size of the market for that good shrinks. Tax Revenue T = the size of the tax Q = the quantity of the good sold T  Q = the government’s tax revenue

16 How a Tax Effects Welfare
Price Demand Supply = PB Q2 PS Price buyers pay sellers receive A F B D C E = P1 Q1 Price without tax Quantity Copyright © South-Western

17 How a Tax Affects Welfare

18 DETERMINANTS OF THE DEADWEIGHT LOSS
What determines whether the deadweight loss from a tax is large or small? The magnitude of the deadweight loss depends on the price elasticities of supply and demand. The greater the elasticities of demand and supply: the larger will be the decline in equilibrium quantity and, the greater the deadweight loss of a tax.

19 Tax Distortions and Elasticities
Inelastic Supply Price Demand Supply When supply is relatively inelastic, the deadweight loss of a tax is small. Size of tax Quantity Copyright © South-Western

20 Tax Distortions and Elasticities
Elastic Supply Price Demand When supply is relatively elastic, the deadweight loss of a tax is large. Size of tax Supply Quantity Copyright © South-Western

21 Tax Distortions and Elasticities
Inelastic Demand Price Supply Demand Size of tax When demand is relatively inelastic, the deadweight loss of a tax is small. Quantity Copyright © South-Western

22 Tax Distortions and Elasticities
Elastic Demand Price Supply Demand Size of tax When demand is relatively elastic, the deadweight loss of a tax is large. Quantity Copyright © South-Western

23 DEADWEIGHT LOSS AND TAX REVENUE AS TAXES VARY
The Deadweight Loss Debate Some economists argue that labor taxes are highly distorting and believe that labor supply is more elastic. Some examples of workers who may respond more to incentives: Workers who can adjust the number of hours they work Families with second earners Elderly who can choose when to retire Workers in the underground economy (i.e., those engaging in illegal activity)

24 DEADWEIGHT LOSS AND TAX REVENUE AS TAXES VARY
With each increase in the tax rate, the deadweight loss of the tax rises even more rapidly than the size of the tax. For the small tax, tax revenue is small. As the size of the tax rises, tax revenue grows. But as the size of the tax continues to rise, tax revenue falls because the higher tax reduces the size of the market. By contrast, tax revenue first rises with the size of a tax, but then, as the tax gets larger, the market shrinks so much that tax revenue starts to fall.

25 Deadweight Loss and Tax Revenue from Three Taxes of Different Sizes
Small Tax Price Demand Deadweight loss Supply PB Q2 PS Tax revenue Q1 Quantity Copyright © South-Western

26 Deadweight Loss and Tax Revenue from Three Taxes of Different Sizes
Medium Tax Price Demand Deadweight loss PB Q2 PS Tax revenue Supply Q1 Quantity Copyright © South-Western

27 Deadweight Loss and Tax Revenue from Three Taxes of Different Sizes
Large Tax Price PB Q2 PS Demand Tax revenue Deadweight loss Supply Q1 Quantity Copyright © South-Western

28 How Deadweight Loss and Tax Revenue Vary with the Size of a Tax
Revenue (the Laffer curve) Tax Revenue Tax Size Copyright © South-Western

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