principles_of_economics_gregory_mankiw

buffalo roamed the continent. Yet hunting the buffalo was so popular during the nineteenth century that by 1900 the animal’s population fell to about 400 before the government stepped in to protect the species. In some African countries today, the elephant faces a similar challenge, as poachers kill the animals for the ivory in their tusks.

Yet not all animals with commercial value face this threat. The cow, for example, is a valuable source of food, but no one worries that the cow will soon be extinct. Indeed, the great demand for beef seems to ensure that the species will continue to thrive.

Why is the commercial value of ivory a threat to the elephant, while the commercial value of beef is a guardian of the cow? The reason is that elephants are a common resource, whereas cows are a private good. Elephants roam freely without any owners. Each poacher has a strong incentive to kill as many elephants as he can find. Because poachers are numerous, each poacher has only a slight incentive to preserve the elephant population. By contrast, cows live on ranches that are privately owned. Each rancher takes great effort to maintain the cow population on his ranch because he reaps the benefit of these efforts.

Governments have tried to solve the elephant’s problem in two ways. Some countries, such as Kenya, Tanzania, and Uganda, have made it illegal to kill elephants and sell their ivory. Yet these laws have been hard to enforce, and elephant populations have continued to dwindle. By contrast, other countries, such as Botswana, Malawi, Namibia, and Zimbabwe, have made elephants a private good by allowing people to kill elephants, but only those on their own property. Landowners now have an incentive to preserve the species on their own land, and as a result, elephant populations have started to rise. With private ownership and the profit motive now on its side, the African elephant might someday be as safe from extinction as the cow.

QUICK QUIZ: Why do governments try to limit the use of common resources?

“WILL THE MARKET PROTECT ME?”

Goods differ in whether they are whether they are rival. A good possible to prevent someone from rival if one person’s enjoyment other people from enjoying the Markets work best for private excludable and rival. Markets do other types of goods.

Public goods are neither rival nor Examples of public goods include national defense, and the creation knowledge. Because people are

Summar y

they have an incentive to free ride provided privately. Therefore,

public goods, making their quantity based on cost-benefit

are rival but not excludable. common grazing land, clean air, and Because people are not charged for

resources, they tend to use them governments try to limit the use

.

Key Concepts

1.Explain what is meant by a good being “excludable.” Explain what is meant by a good being “rival.” Is a pizza excludable? Is it rival?

2.Define and give an example of a public good. Can the private market provide this good on its own? Explain.

3.What is cost-benefit analysis of public goods? Why is it important? Why is it hard?

4.Define and give an example of a common resource. Without government intervention, will people use this good too much or too little? Why?

1.The text says that both public goods and common resources involve externalities.

a.Are the externalities associated with public goods generally positive or negative? Use examples in your answer. Is the free-market quantity of public goods generally greater or less than the efficient quantity?

b.Are the externalities associated with common resources generally positive or negative? Use examples in your answer. Is the free-market use of common resources generally greater or less than the efficient use?

2.Think about the goods and services provided by your local government.

a.Using the classification in Figure 11-1, explain what category each of the following goods falls into:

police protection

snow plowing

education

rural roads

city streets

b.Why do you think the government provides items that are not public goods?

3.Charlie loves watching Teletubbies on his local public TV station, but he never sends any money to support the station during their fund-raising drives.

a.What name do economists have for Charlie?

b.How can the government solve the problem caused by people like Charlie?

c.Can you think of ways the private market can solve this problem? How does the existence of cable TV alter the situation?

4.The text states that private firms will not undertake the efficient amount of basic scientific research.

a.Explain why this is so. In your answer, classify basic research in one of the categories shown in Figure 11-1.

b.What sort of policy has the United States adopted in response to this problem?

c.It is often argued that this policy increases the technological capability of American producers relative to that of foreign firms. Is this argument consistent with your classification of basic research in part (a)? (Hint: Can excludability apply to some potential beneficiaries of a public good and not others?)

5.Why is there litter along most highways but rarely in people’s yards?

6.The Washington, D.C., metro (subway) system charges higher fares during rush hours than during the rest of the day. Why might it do this?

7.Timber companies in the United States cut down many trees on publicly owned land and many trees on privately owned land. Discuss the likely efficiency of logging on each type of land in the absence of government regulation. How do you think the government should regulate logging on publicly owned lands? Should similar regulations apply to privately owned land?

8.An Economist article (March 19, 1994) states: “In the past decade, most of the rich world’s fisheries have been exploited to the point of near-exhaustion.” The article continues with an analysis of the problem and a discussion of possible private and government solutions:

a.“Do not blame fishermen for overfishing. They are behaving rationally, as they have always done.” In what sense is “overfishing” rational for fishermen?

b.“A community, held together by ties of obligation and mutual self-interest, can manage a common resource on its own.” Explain how such management can work in principle, and what obstacles it faces in the real world.

c.“Until 1976 most world fish stocks were open to all comers, making conservation almost impossible. Then an international agreement extended some aspects of [national] jurisdiction from 12 to 200 miles offshore.” Using the concept of property rights, discuss how this agreement reduces the scope of the problem.

d.The article notes that many governments come to the aid of suffering fishermen in ways that encourage increased fishing. How do such policies encourage a vicious cycle of overfishing?

e.“Only when fishermen believe they are assured a long-term and exclusive right to a fishery are they likely to manage it in the same far-sighted way as good farmers manage their land.” Defend this statement.

f.What other policies to reduce overfishing might be considered?

9.In a market economy, information about the quality or function of goods and services is a valuable good in its

own right. How does the private market provide this information? Can you think of any way in which the government plays a role in providing this information?

10.Do you think the Internet is a public good? Why or why not?

11.High-income people are willing to pay more than lowerincome people to avoid the risk of death. For example,

they are more likely to pay for safety features on cars. Do you think cost-benefit analysts should take this fact into account when evaluating public projects? Consider, for instance, a rich town and a poor town, both of which are considering the installation of a traffic light. Should the rich town use a higher dollar value for a human life in making this decision? Why or why not?

T H E D E S I G N O F

T H E T A X S Y S T E M

Al “Scarface” Capone, the notorious 1920s gangster and crime boss, was never convicted for his many violent crimes. Yet eventually he did go to jail—for tax evasion. He had neglected to heed Ben Franklin’s observation that “in this world nothing is certain, but death and taxes.”

When Franklin made this claim in 1789, the average American paid less than 5 percent of his income in taxes, and that remained true for the next hundred years. Over the course of the twentieth century, however, taxes have become ever more important in the life of the typical person. Today, all taxes taken together— including personal income taxes, corporate income taxes, payroll taxes, sales taxes, and property taxes—use up about a third of the average American’s income. In many European countries, the tax bite is even larger.

Taxes are inevitable because we as citizens expect the government to provide us with various goods and services. The previous two chapters have started to

IN THIS CHAPTER YOU WILL . . .

Get an over view of how the U . S . government raises and spends money

Examine the ef ficiency costs

of taxes

Learn alternative ways to judge the equity of a tax system

See why studying tax incidence is cr ucial for evaluating tax equity

Consider the tradeof f between ef ficiency and equity in the design of a tax system

GOVERNMENT REVENUE AS A PERCENTAGE OF GDP. This figure shows revenue of the federal government and of state and local governments as a percentage of gross domestic product (GDP), which measures total income in the economy. It shows that the government plays a large role in the U.S. economy and that its role has grown over time.

SOURCE: Historical Statistics of the United States; Economic Report of the President 1999; and author’s calculations.

Figure 12-1

Table 12-1

CENTRAL GOVERNMENT TAX

REVENUE AS A PERCENT OF GDP

Table 12-2

RECEIPTS OF THE FEDERAL

GOVERNMENT: 1999

The U.S. federal government collects about two-thirds of the taxes in our economy. It raises this money in a number of ways, and it finds even more ways to spend it.

Receipts Table 12-2 shows the receipts of the federal government in 1999. Total receipts in this year were $1,806 billion, a number so large that it is hard to comprehend. To bring this astronomical number down to earth, we can divide it by the size of the U.S. population, which was about 272 million in 1999. We then find that the average American paid $6,639 to the federal government. A typical family of four paid $26,556.

The largest source of revenue for the federal government is the individual income tax. As April 15 approaches, almost every American family fills out a tax form to determine how much income tax it owes the government. Each family is required to report its income from all sources: wages from working, interest on savings, dividends from corporations in which it owns shares, profits from any small businesses it operates, and so on. The family’s tax liability (how much it owes) is then based on its total income.

A family’s income tax liability is not simply proportional to its income. Instead, the law requires a more complicated calculation. Taxable income is computed as total income minus an amount based on the number of dependents (primarily children) and minus certain expenses that policymakers have deemed “deductible” (such as mortgage interest payments and charitable giving). Then the tax liability is calculated from taxable income using the schedule shown in Table 12-3. This table presents the marginal tax rate—the tax rate applied to each additional dollar of income. Because the marginal tax rate rises as income rises, higher-income families pay a larger percentage of their income in taxes. (We discuss the concept of marginal tax rate more fully later in this chapter.)

Almost as important to the federal government as the individual income tax are payroll taxes. A payroll tax is a tax on the wages that a firm pays its workers. Table 12-2 calls this revenue social insurance taxes because the revenue from these taxes is earmarked to pay for Social Security and Medicare. Social Security is an income support program, designed primarily to maintain the living standards of the elderly. Medicare is the government health program for the elderly. Table 12-2 shows that the average American paid $2,239 in social insurance taxes in 1999.

Next in magnitude, but much smaller than either individual income taxes or social insurance taxes, is the corporate income tax. A corporation is a business that is set up as a separate legal entity. The government taxes each corporation based on its profit—the amount the corporation receives for the goods or services it sells minus the costs of producing those goods or services. Notice that corporate profits are, in essence, taxed twice. They are taxed once by the corporate income tax when the corporation earns the profits; they are taxed a second time by the individual income tax when the corporation uses its profits to pay dividends to its shareholders.

The last category, labeled “other” in Table 12-2, makes up 8 percent of receipts. This category includes excise taxes, which are taxes on specific goods like gasoline, cigarettes, and alcoholic beverages. It also includes various small items, such as estate taxes and customs duties.

Spending Table 12-4 shows the spending of the federal government in 1999. Total spending was $1,727 billion, or $6,350 per person. This table also shows how the federal government’s spending was divided among major categories.

The largest category in Table 12-4 is Social Security, which represents mostly transfer payments to the elderly. (A transfer payment is a government payment not made in exchange for a good or service.) This category made up 23 percent of spending by the federal government in 1999 and is growing in importance. The reason for its growth is that increases in life expectancy and decreases in birthrates have caused the elderly population to grow more rapidly than the total population. Most analysts expect this trend to continue for many years into the future.

The second largest category of spending is national defense. This includes both the salaries of military personnel and the purchases of military equipment such as guns, fighter jets, and warships. Spending on national defense fluctuates over time as international tensions and the political climate change. Not surprisingly, spending on national defense rises substantially during wars.

The third category is spending on income security, which includes transfer payments to poor families. One program is Temporary Assistance for Needy Families (TANF), often simply called “welfare.” Another is the Food Stamp program, which gives poor families vouchers that they can use to buy food. The federal government pays some of this money to state and local governments, which administer the programs under federal guidelines.

A bit smaller than spending on income security is net interest. When a person borrows from a bank, the bank requires the borrower to pay interest for the loan. The same is true when the government borrows from the public. The more indebted the government, the larger the amount it must spend in interest payments.

Table 12-3

THE FEDERAL INCOME TAX

RATES: 1999. This table shows the marginal tax rates for an unmarried taxpayer. The taxes owed by a taxpayer depend on all the marginal tax rates up to his or her income level. For example, a taxpayer with income of $50,000 pays 15 percent of the first $25,750 of income, and then 28 percent of the rest.

Table 12-4

SPENDING OF THE FEDERAL

GOVERNMENT: 1999

SOURCE: Economic Report of the President, 1999, table B-80.

budget surplus

an excess of government receipts over government spending

budget deficit

an excess of government spending over government receipts

Medicare, the next category in Table 12-4, is the government’s health plan for the elderly. Spending in this category has risen substantially over time for two reasons. First, the elderly population has grown more quickly than the overall population. Second, the cost of health care has risen more rapidly than the cost of other goods and services. The rapid growth of this budget item is one reason that President Clinton and others have proposed reforms of the health care system.

The next category is health spending other than Medicare. This includes Medicaid, the federal health program for the poor. It also includes spending on medical research, such as through the National Institutes of Health.

The “other” category in Table 12-4 consists of many less expensive functions of government. It includes, for example, the federal court system, the space program, and farm-support programs, as well as the salaries of Congress and the president.

You might have noticed that total receipts of the federal government shown in Table 12-2 exceed total spending shown in Table 12-4 by $79 billion. Such an excess of receipts over spending is called a budget surplus. When receipts fall short of spending, the government is said to run a budget deficit. The government finances the budget deficit by borrowing from the public. When the government runs a budget surplus, it uses the excess receipts to reduce its outstanding debts.

STATE AND LOCAL GOVERNMENT

State and local governments collect about 40 percent of all taxes paid. Let’s look at how they obtain tax revenue and how they spend it.

Receipts Table 12-5 shows the receipts of U.S. state and local governments. Total receipts for 1996 were $1,223 billion. Based on the 1996 population of about 265 million, this equals $4,615 per person. The table also shows how this total is broken down into different kinds of taxes.

The two most important taxes for state and local governments are sales taxes and property taxes. Sales taxes are levied as a percentage of the total amount spent at retail stores. Every time a customer buys something, he or she pays the