# Measuring a Nation s Income

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1 Measuring a Nation s Income 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). 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. 1

2 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. 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. 2

3 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. 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. 3

4 2. The value of intermediate goods is already included as part of the value of the final good. 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. 4

5 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. IV. FYI: Other Measures of Income 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. 5

6 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. V. 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 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. 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. 6

7 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. E. Definition of net exports: spending on domestically produced goods by foreigners (exports) minus spending on foreign goods by domestic residents (imports). VI. 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 7

8 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 2005 \$1 100 \$ \$2 150 \$ \$3 200 \$ Definition of nominal GDP: the production of goods and services valued at current prices. Nominal GDP for 2005 = (\$1 100) + (\$2 50) = \$200. Nominal GDP for 2006 = (\$2 150) + (\$3 100) = \$600. Nominal GDP for 2007 = (\$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 2005 = (\$1 100) + (\$2 50) = \$200. Real GDP for 2006 = (\$1 150) + (\$2 100) = \$350. Real GDP for 2007 = (\$1 200) + (\$2 150) = \$500. 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. 8

9 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 100. Nominal GDP GDP deflator 100 Real GDP 2. Example Calculations GDP Deflator for 2001 = (\$200 / \$200) 100 = 100. GDP Deflator for 2002 = (\$600 / \$350) 100 = 171. GDP Deflator for 2003 = (\$1200 / \$500) 100 = 240. VII. Is GDP a Good Measure of Economic Well-Being? 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 9

10 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: 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. 3. 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. 10

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