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KRUGMAN'S MICROECONOMICS for AP* Introduction to Externalities Margaret Ray and David Anderson Econ: 74 Module.

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Presentation on theme: "KRUGMAN'S MICROECONOMICS for AP* Introduction to Externalities Margaret Ray and David Anderson Econ: 74 Module."— Presentation transcript:

1 KRUGMAN'S MICROECONOMICS for AP* Introduction to Externalities Margaret Ray and David Anderson Econ: 74 Module

2 What you will learn in this Module : What externalities are and why they can lead to inefficiency in a market economy. Why externalities often require government intervention. The difference between negative and positive externalities. The importance of the Coase theorem, which explains how private individuals can sometimes

3 I. The Economics of Pollution A.Marginal social cost (MSC): the additional costs imposed on society as a result of one more unit of pollution. B.Marginal social benefit (MSB): the additional benefits received by society as a result of one more unit of pollution.

4 II. The External Cost of Pollution A.External Cost – an uncompensated cost that an individual or firm imposes on others B.Also called a negative externality

5 The Inefficiency of Excess Pollution Q opt MSC and MSB of pollution MSB MSC MSC=MSB Q mkt $1000 Qty of Pollution Emitted (tons) At Q mkt, suppose we could reduce pollution by one ton. What would we lose? Since MSB is zero, one less ton of pollution would come at almost $0 of sacrifice to society. What would we gain? Since MSC is $1000, if we reduced pollution by one ton we would avoid nearly $1000 of harmful costs.

6 III. Private Solutions to Externalities A.The Coase Theorem - so long as property rights are clearly defined, and transaction costs are minimal, a private solution can be found to a situation such as this. B.These private solutions internalize the externality. The party that is imposing the hardships on the other is required to compensate the victim. C.Many times transaction costs are too high to make a private solution easy to negotiate. (legal costs)

7 KRUGMAN'S MICROECONOMICS for AP* Externalities and Public Policy Margaret Ray and David Anderson Econ: 75 Module

8 What you will learn in this Module : How external benefits and costs cause inefficiency in markets. Why some government policies to deal with externalities, such as emissions taxes, tradable emissions permits, and Pigouvian subsidies, are efficient, although others, including environmental standards, are not.

9 I. Policies Toward Pollution A.Environmental Standards B.Emissions Taxes C.Tradable Emissions Permits

10 Production, Consumption, and Externalities Private versus social benefits Private versus social costs

11 II. Negative Externalities A.When the production and consumption of a good creates costs to third parties, that good is said to create negative externalities to society. B.Pigouvian Tax Qty electricity Price, MSC MPC D MSC P opt Q opt Q mkt P mkt Tax P firm

12 III. Positive Externalities A.When the production and consumption of a good provides benefits to third parties, that good is said to provide positive externalities to society. B.Pigouvian Subsidy Qty home improvements Price, MSB MPB MSB S P opt Q opt Q mkt P mkt Subsidy P cons

13 IV. Network Externalities A.A network externality exists when the value to an individual of a good or service depends on how many other people use the same good or service. B.Example: When more people use Facebook or Twitter, it becomes more valuable to you

14 KRUGMAN'S MICROECONOMICS for AP* Public Goods Margaret Ray and David Anderson Econ: 76 Module

15 What you will learn in this Module : How public goods are characterized and why markets fail to supply efficient quantities of public goods. What common resources are and why they are overused. What artificially scarce goods are and why they are under-consumed. How government intervention in the production and consumption of these types of goods can make society better off. Why finding the right level of government intervention is often difficult.

16 I. Private Goods A.Private goods are what we have studied thus far B.Private goods have two characteristics. They are; 1.Excludable- You can prevent people who dont pay from consuming it 2.Rival- the unit of the good cannot be consumed by more than one person at the same time

17 II. Public Goods A.Public goods are; 1.Non-excludable- Cant exclude anyone on basis of payment 2.Non-rival- more than one person can consume it at the same time without the benefit going down

18 III. Common Resources A.Common resources are; 1.Non-excludable 2.Rival

19 IV. Artificially Scarce Goods A.Artificially scarce goods are; 1.Excludable 2.Non-rival

20 V. Markets Only Provide Private Goods Efficiently A.Markets will not provide the efficient level of public goods B.The efficient level of public goods is the quantity where MSC = MSB

21 VI. Providing Common Resources A.The problem of overuse and the Tragedy of the Commons B.Maintaining a common resource C.Examples of common resources? iphoto

22 VII. The Efficient Level of Artificially Scarce Goods A.MC of providing the good is zero B.Firms cant set price equal to zero C.Example of artificially scarce good?

23 KRUGMAN'S MICROECONOMICS for AP* Public Policy to Promote Competition Margaret Ray and David Anderson Econ: 77 Module

24 What you will learn in this Module : The three major antitrust laws and how they are used to promote competition. How government regulation is used to prevent inefficiency in the case of natural monopoly. The pros and cons of using marginal cost pricing and average cost pricing to regulate prices in natural monopolies.

25 I. Promoting Competition and Efficiency A.Antitrust laws 1.Protect competition 2.Ensure lower prices 3.Promote development of better products B.Price regulation 1.When economies of scale make it efficient to have one firm in a market, that natural monopoly can be taken over by the government or regulated

26 II. Antitrust Laws A.Sherman Act B.Clayton Act C.FTC Act

27 III. Price Regulation A.Marginal-cost pricing- the firm must operate at the point where P=MC. Government would subsidize any losses at taxpayer expense. B.Average-cost pricing- the firm must operate at the point where P=ATC. This insures that the firm will earn normal economic profit, but some dead weight loss will occur.

28 KRUGMAN'S MICROECONOMICS for AP* Income Distribution and Income Inequality Margaret Ray and David Anderson Econ: 78 Module

29 What you will learn in this Module : What defines poverty, what causes poverty, and the consequences of poverty. How income inequality in America has changed over time. How programs like Social Security affect poverty and income inequality.

30 I. Poverty Trends in poverty Who is poor? Causes of poverty Consequences of poverty

31 II. Lorenz Curve Lorenz curve: A Lorenz curve shows the degree of inequality that exists in the distributions of two variables, and is often used to illustrate the extent that income or wealth are distributed unequally in a particular society. Gini coefficient: A Gini coefficient is a summary numerical measure of how unequally one variable is related to another. The Gini coefficient is a number between 0 and 1, where perfect equality has a Gini coefficint of zero, and absolute inequality yields a Gini coefficint of 1

32 III. Income Inequality Using quintiles to analyze income distribution The Gini coefficient Income group Average 2008 income % of total income if distributed equally 2008 % of total income Bottom quintile $11,65620%3.4% Second quintile $29,51720%8.6% Third quintile$50,13220%14.7% Fourth quintile $79,76020%23.3% Top quintile$171,05720%50%

33 IV. Economic Insecurity A. In addition to the problem of poverty, we are concerned with the possibility that people or families can fall into poverty due to unanticipated events. B.Because these uncertain events can cause any family to have economic insecurity, we have a welfare state to provide temporary assistance.

34 V. U.S. Antipoverty Programs A.Means-tested 1.Criteria is established to qualify 2.An example would be level of income and size of family B.Social Security and unemployment insurance – Social Security funded by tax on wages – Unemployment funded by tax on employers C.The effects of programs on poverty – Research says yes, but…

35 VI. The Debate Over Income Redistribution Problems with income redistribution The politics of income redistribution Barstool Economics

36 The Laffer Curve The curve suggests that, as taxes increase from low levels, tax revenue collected by the government also increases. It also shows that tax rates increasing after a certain point (T*) would cause people not to work as hard or not at all, thereby reducing tax revenue. Eventually, if tax rates reached 100% (the far right of the curve), then all people would choose not to work because everything they earned would go to the government.


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