# MEASURING A NATION S INCOME

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1 10 MEASURING A NATION S INCOME WHAT S NEW IN THE FIFTH EDITION: There is more clarification on the GDP deflator. The Case Study on Who Wins at the Olympics? is now an FYI box. LEARNING OBJECTIVES: By the end of this chapter, students should understand: why an economy s total income equals its total expenditure. how gross domestic product (GDP) is defined and calculated. the breakdown of GDP into its four major components. the distinction between real GDP and nominal GDP. whether GDP is a good measure of economic well-being. CONTEXT AND PURPOSE: Chapter10 is the first chapter in the macroeconomic section of the text. It is the first of a two-chapter sequence that introduces students to two vital statistics that economists use to monitor the macroeconomy GDP and the consumer price index. Chapter 10 develops how economists measure production and income in the macroeconomy. The following chapter, Chapter 11, develops how economists measure the level of prices in the macroeconomy. Taken together, Chapter 10 concentrates on the quantity of output in the macroeconomy while Chapter 11 concentrates on the price of output in the macroeconomy. The purpose of this chapter is to provide students with an understanding of the measurement and the use of gross domestic product (GDP). GDP is the single most important measure of the health of the macroeconomy. Indeed, it is the most widely reported statistic in every developed economy. 426

2 Chapter 10/Measuring a Nation s Income 427 KEY POINTS: Because every transaction has a buyer and a seller, the total expenditure in the economy must equal the total income in the economy. Gross domestic product (GDP) measures an economy s total expenditure on newly produced goods and services and the total income earned from the production of these goods and services. More precisely, GDP is the market value of all final goods and services produced within a country in a given period of time. GDP is divided among four components of expenditure: consumption, investment, government purchases, and net exports. Consumption includes spending on goods and services by households, with the exception of purchases of new housing. Investment includes spending on new equipment and structures, including households purchases of new housing. Government purchases include spending on goods and services by local, state, and federal governments. Net exports equal the value of goods and services produced domestically and sold abroad (exports) minus the value of goods and services produced abroad and sold domestically (imports). Nominal GDP uses current prices to value the economy s production of goods and services. Real GDP uses constant base-year prices to value the economy s production of goods and services. The GDP deflator calculated from the ratio of nominal to real GDP measures the level of prices in the economy. GDP is a good measure of economic well-being because people prefer higher incomes to lower incomes. But it is not a perfect measure of well-being. For example, GDP excludes the value of leisure and the value of a clean environment. CHAPTER OUTLINE: Regardless of whether microeconomics is taught before macroeconomics or vice versa, students need to be reminded of the differences between the two areas of study. Begin by defining the two terms and contrasting and comparing their focus. I. Review of the Definitions of Microeconomics and Macroeconomics A. Definition of microeconomics: the study of how households and firms make decisions and how they interact in markets. B. Definition of macroeconomics: the study of economy-wide phenomena including inflation, unemployment, and economic growth. II. The Economy s Income and Expenditure A. To judge whether or not an economy is doing well, it is useful to look at Gross Domestic Product (GDP).

3 428 Chapter 10/Measuring a Nation s Income Students have heard of GDP and they are genuinely interested in learning more about what it is. The basic point that you must get across is that GDP is a measure of both aggregate production and aggregate income in a nation over a period of one year. You can demonstrate this by using the circular-flow diagram and explaining that production generates income, which provides the purchasing power that generates the demand for the products. 1. GDP measures the total income of everyone in the economy. 2. GDP measures total expenditure on an economy s output of goods and services. B. For an economy as a whole, total income must equal total expenditure. 1. If someone pays someone else \$100 to mow a lawn, the expenditure on the lawn service (\$100) is exactly equal to the income earned from the production of the lawn service (\$100). 2. We can also use the circular-flow diagram from Chapter 2 to show why total income and total expenditure must be equal. Figure 1 a. Households buy goods and services from firms; firms use this money to pay for resources purchased from households. b. In the simple economy described by this circular-flow diagram, calculating GDP could be done by adding up the total purchases of households or summing total income earned by households.

4 Chapter 10/Measuring a Nation s Income 429 c. Note that this simple diagram is somewhat unrealistic as it omits saving, taxes, government purchases, and investment purchases by firms. However, because a transaction always has a buyer and a seller, total expenditure in the economy must be equal to total income. III. The Measurement of Gross Domestic Product A. Definition of gross domestic product (GDP): the market value of all final goods and services produced within a country in a given period of time. To put GDP in terms the student may understand better, explain to them that GDP represents the amount of money one would need to purchase one year s worth of the economy s production of all final goods and services. Have a contest and see which student can come closest in guessing the level of GDP for the United States last year. B. GDP Is the Market Value To add together different items, market values are used. 2. Market values are calculated by using market prices. C.... Of All GDP includes all items produced and sold legally in the economy. 2. The value of housing services is somewhat difficult to measure. a. If housing is rented, the value of the rent is used to measure the value of the housing services. b. For housing that is owned (or mortgaged), the government estimates the rental value and uses this figure to value the housing services. 3. GDP does not include illegal goods or services or items that are not sold in markets. a. When you hire someone to mow your lawn, that production is included in GDP. b. If you mow your own lawn, that production is not included in GDP. D.... Final Intermediate goods are not included in GDP. Make sure that students realize that investment goods (such as structures and vehicles used in production) are not intermediate goods. Investment goods represent products purchased for final use by business firms. 2. The value of intermediate goods is already included as part of the value of the final good.

5 430 Chapter 10/Measuring a Nation s Income 3. Goods that are placed into inventory are considered to be final and included in GDP as a firm s inventory investment. a. Goods that are sold out of inventory are counted as a decrease in inventory investment. b. The goal is to count the production when the good is finished, which is not necessarily the same time that the product is sold. E.... Goods and Services GDP includes both tangible goods and intangible services. F.... Produced Only current production is counted. 2. Used goods that are sold do not count as part of GDP. G.... Within a Country GDP measures the production that takes place within the geographical boundaries of a particular country. 2. If a Canadian citizen works temporarily in the United States, the value of his output is included in GDP for the United States. If an American owns a factory in Haiti, the value of the production of that factory is not included in U.S. GDP. Students sometimes have trouble understanding that the production of a foreign firm operating in the United States is part of U.S. GDP. Help them make the connection by using the circular-flow diagram. Show them that, even if it is a foreign firm, the firm s workers are living in the United States and buying clothes, groceries, and other goods in the United States. Thus, the workers in the foreign firm operating in the United States are fueling the domestic economy. H.... in a Given Period of Time. 1. The usual interval of time used to measure GDP is a quarter (three months). 2. When the government reports GDP, the data are generally reported on an annual basis. 3. In addition, data are generally adjusted for regular seasonal changes (such as Christmas). I. In addition to summing expenditure, the government also calculates GDP by adding up total income in the economy. 1. The two ways of calculating GDP almost exactly give the same answer. 2. The difference between the two calculations of GDP is called the statistical discrepancy.

6 Chapter 10/Measuring a Nation s Income 431 J. FYI: Other Measures of Income It can be a challenge to teach all of these definitions without putting your students to sleep. Concentrate on the measures that will mean the most to students as the semester progresses. A. Gross National Product (GNP) is the total income earned by a nation s permanent residents. 1. GNP includes income that American citizens earn abroad. 2. GNP excludes income that foreigners earn in the United States. B. Net National Product (NNP) is the total income of a nation s residents (GNP) minus losses from depreciation (wear and tear on an economy s stock of equipment and structures). C. National income is the total income earned by a nation s residents in the production of goods and services. 1. National income differs from NNP by excluding indirect business taxes and including business subsidies. 2. NNP and national income also differ due to statistical discrepancy. D. Personal income is the income that households and noncorporate businesses receive. E. Disposable personal income is the income that households and noncorporate businesses have left after taxes and other obligations to the government. IV. The Components of GDP A. GDP (Y ) can be divided into four components: consumption (C ), investment (I ), government purchases (G ), and net exports (NX ). Y = C + I + G + NX Students will ask why GDP is called Y. Remind them that in equilibrium GDP expenditures must be equal to income. The Y stands for income because the letter I is used for investment. B. Definition of consumption: spending by households on goods and services, with the exception of purchases of new housing. C. Definition of investment: spending on capital equipment, inventories, and structures, including household purchases of new housing. 1. GDP accounting uses the word investment differently from how we use the term in everyday conversation. 2. When a student hears the word investment, he or she thinks of financial instruments such as stocks and bonds.

7 432 Chapter 10/Measuring a Nation s Income 3. In GDP accounting, investment means purchases of investment goods such as capital equipment, inventories, or structures. D. Definition of government purchases: spending on goods and services by local, state, and federal governments. 1. Salaries of government workers are counted as part of the government purchases component of GDP. 2. Transfer payments are not included as part of the government purchases component of GDP. Spend some time in class distinguishing between government purchases and transfer payments. Point out that transfer payments are actually negative taxes representing payments from the government to individuals (with no good or service provided in return) rather than payments from individuals to the government. Define net taxes as the difference between taxes and transfers. E. Definition of net exports: spending on domestically produced goods by foreigners (exports) minus spending on foreign goods by domestic residents (imports). Table 1 F. Case Study: The Components of U.S. GDP 1. Table 1 shows these four components of GDP for The data for GDP come from the Bureau of Economic Analysis, which is part of the Department of Commerce. Make sure that you point out Table 1. Call attention to the importance of consumption and the negative number in the net exports column. V. Real Versus Nominal GDP A. There are two possible reasons for total spending to rise from one year to the next. 1. The economy may be producing a larger output of goods and services. 2. Goods and services could be selling at higher prices. B. When studying GDP over time, economists would like to know if output has changed (not prices). C. Thus, economists measure real GDP by valuing output using a fixed set of prices. D. A Numerical Example Make sure that you do this example or a similar numerical example in class. If you feel comfortable improvising, let the students pick two goods and then make up an example with them.

8 Chapter 10/Measuring a Nation s Income 433 Table 2 1. Two goods are being produced: hot dogs and hamburgers. Year Price of Hot Dogs Quantity of Hot Dogs Price of Hamburgers Quantity of Hamburgers 2008 \$1 100 \$ \$2 150 \$ \$3 200 \$ Definition of nominal GDP: the production of goods and services valued at current prices. Nominal GDP for 2008 = (\$1 100) + (\$2 50) = \$200. Nominal GDP for 2009 = (\$2 150) + (\$3 100) = \$600. Nominal GDP for 2010 = (\$3 200) + (\$4 150) = \$1, Definition of real GDP: the production of goods and services valued at constant prices. Let s assume that the base year is Real GDP for 2008 = (\$1 100) + (\$2 50) = \$200. Real GDP for 2009 = (\$1 150) + (\$2 100) = \$350. Real GDP for 2010 = (\$1 200) + (\$2 150) = \$500. Make sure that it is clear to students how to calculate these numbers so that they can compute nominal GDP and real GDP on their own. E. Because real GDP is unaffected by changes in prices over time, changes in real GDP reflect changes in the amount of goods and services produced. Emphasize that when there is inflation, nominal GDP can increase while real GDP actually declines. Make sure that students understand that real GDP will be used as a proxy for aggregate production throughout the course.

9 434 Chapter 10/Measuring a Nation s Income ALTERNATIVE CLASSROOM EXAMPLE: The country of (insert name based on school mascot such as Pantherville or Owlstown ) produces two goods: footballs and basketballs. Below is a table showing prices and quantities of output for three years: Year Price of Footballs Quantity of Footballs Price of Basketballs Quantity of Basketballs Year 1 \$ \$ Year Year Nominal GDP in Year 1 = (\$10 120) + (\$12 200) = \$3,600 Nominal GDP in Year 2 = (\$12 200) + (\$15 300) = \$6,900 Nominal GDP in Year 3 = (\$14 180) + (\$18 275) = \$7,470 Using Year 1 as the Base Year: Real GDP in Year 1 = (\$10 120) + (\$12 200) = \$3,600 Real GDP in Year 2 = (\$10 200) + (\$12 300) = \$5,600 Real GDP in Year 3 = (\$10 180) + (\$12 275) = \$5,100 (Note that nominal GDP rises from Year 2 to Year 3, but real GDP falls.) GDP deflator for Year 1 = (\$3,600/\$3,600) 100 = = 100 GDP deflator for Year 2 = (\$6,900/\$5,600) 100 = = GDP deflator for Year 3 = (\$7,470/\$5,100) 100 = = F. The GDP Deflator 1. Definition of GDP deflator: a measure of the price level calculated as the ratio of nominal GDP to real GDP times Example Calculations Nominal GDP GDP deflator = 100 Real GDP GDP Deflator for 2008 = (\$200 / \$200) 100 = 100. GDP Deflator for 2009 = (\$600 / \$350) 100 = 171. GDP Deflator for 2010 = (\$1200 / \$500) 100 = 240. Make sure that you point out that nominal GDP and real GDP will be equal in the base year. This implies that the GDP deflator for the base year will always be equal to 100. G. Case Study: Real GDP over Recent History Figure 2 1. Figure 2 shows quarterly data on real GDP for the United States since We can see that real GDP has increased over time.

10 Chapter 10/Measuring a Nation s Income We can also see that there are times when real GDP declines. These periods are called recessions. VI. Is GDP a Good Measure of Economic Well-Being? Get students involved in a discussion of the merits and problems involved with using GDP as a measure of well-being. Students are often as interested in what is not included in GDP as they are in what is included. Have the students break into small groups and list the things that might be missing if we use GDP as a measure of wellbeing. Then, have each group report their results and summarize them on the board. A. GDP measures both an economy s total income and its total expenditure on goods and services. B. GDP per person tells us the income and expenditure level of the average person in the economy. C. GDP, however, may not be a very good measure of the economic well-being of an individual. 1. GDP omits important factors in the quality of life including leisure, the quality of the environment, and the value of goods produced but not sold in formal markets. 2. GDP also says nothing about the distribution of income. 3. However, a higher GDP does help us achieve a good life. Nations with larger GDP generally have better education and better health care. D. In the News: The Underground Economy 1. The measurement of GDP misses many transactions that take place in the underground economy. 2. This article compares the underground economies of the United States and several other countries. E. Case Study: International Differences in GDP and the Quality of Life Table 3 1. Table 3 shows real GDP per person, life expectancy, adult literacy rates, and Internet usage for 12 countries. 2. In rich countries, life expectancy is higher and adult literacy and Internet usage rates are also high. 3. In poor countries, people typically live only into their 50s, only about half of the adult population is literate, and Internet usage is very rare.

11 436 Chapter 10/Measuring a Nation s Income Activity 1 GDP and Well-Being Type: Topics: Materials needed: Time: Class limitations: In-class demonstration Per capita GDP None 15 minutes Works in any size class Purpose This activity examines the usefulness and limits of measures of GDP. Students often have difficulty accepting the use of GDP as a proxy for well-being. Per capita GDP does not directly measure well-being but it is highly correlated with direct measures. Making this correlation explicit helps students understand the emphasis on GDP in macroeconomics. Instructions Ask students the following questions. Discuss each before moving to the next question. 1. If GDP is a good measure of well-being, why is Switzerland s GDP so much lower than India s GDP or China s GDP? 2. What measures would be better to compare the well-being of different countries? 3. How do you expect these direct measures to correlate with per capita GDP? Common Answers and Points for Discussion 1. GDP itself tells very little; Switzerland s GDP is much lower than that of India or China, yet Swiss citizens have one of the highest standards of living in the world. The difference, of course, is population. Switzerland is a small country, so its GDP is relatively small, despite its wealth. The appropriate comparison is per capita GDP. A more interesting question is Is per capita GDP a good measure of well-being? Or worded another way: What constitutes well-being? 2. Well-being can be measured directly in a variety of ways. Students often suggest these: Health care Food Education These are certainly better measures than money income, but they can be difficult to collect and interpret. 3. Although per capita GDP is not a direct measure of well-being, it can be used as a proxy for direct measures. The wealthiest countries have per capita incomes over 10 times higher than the poorest. E. FYI: Who Wins at the Olympics? 1. When the Olympics end, commentators use the number of medals each nation takes as a measure of success. 2. In studying the determinants of success at the Olympics, two economists have found that the level of total GDP matters. It does not matter if the high total comes from a high level of GDP per person or from a large population.

12 Chapter 10/Measuring a Nation s Income In addition to GDP, two other factors influence the number of medals won. a. The host country usually earns extra medals. b. The former communist countries of Eastern Europe earn more medals than other countries with similar levels of GDP. SOLUTIONS TO TEXT PROBLEMS: Quick Quizzes: 1. Gross domestic product measures two things at once: (1) the total income of everyone in the economy and (2) the total expenditure on the economy s output of final goods and services. It can measure both of these things at once because all expenditure in the economy ends up as someone s income. 2. The production of a pound of caviar contributes more to GDP than the production of a pound of hamburger because the contribution to GDP is measured by market value and the price of a pound of caviar is much higher than the price of a pound of hamburger. 3. The four components of expenditure are: (1) consumption; (2) investment; (3) government purchases; and (4) net exports. The largest component is consumption, which accounts for more than two-thirds of total expenditure. 4. Real GDP is the production of goods and services valued at constant prices. Nominal GDP is the production of goods and services valued at current prices. Real GDP is a better measure of economic well-being because changes in real GDP reflect changes in the amount of output being produced. Thus, a rise in real GDP means people have produced more goods and services, but a rise in nominal GDP could occur either because of increased production or because of higher prices. 5. Although GDP is not a perfect measure of well-being, policymakers should care about it because a larger GDP means that a nation can afford better healthcare, better educational systems, and more of the material necessities of life.

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