# Data and Questions of Macroeconomics

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1 Data and Questions of Macroeconomics Key Macroeconomic Variables National Income Unemployment Inflation Stock market index Interest rates Exchange rates Government budget balance Trade balance For each of these questions we want to address the following questions: What would we like these variables to measure? How, in fact, are they measured? How have they performed historically? Why do we care about these data? For now, we will look at just the first three. 1

2 National Income What would we like it to measure? Our standard of living How, in fact, is it measured? ureau of Economic nalysis is responsible for construction and maintenance of national income and product accounts (NIP). Measurement began in the 1930s due to frustration of Roosevelt and Hoover trying to design policies to combat the Great Depression. Simon Kuznets (Nobel laureate) was commissioned to develop initial methodology and estimates. In 1947, the process became much more consistent. Methodologies have frequently been changed (improved?) as a result of advances in economics, accounting, and data collection. Past data are then revised to reflect new definitions. 2

3 There are two main measures of national income: Gross domestic product (GDP) and Gross national product (GNP) GDP is an attempt to measure production in the country GNP is an attempt to measure income accruing to a country s residents. GNP Relation of GNP to GDP in the US, 1990 Minus Income earned by citizens from work conducted or capital owned abroad Plus: Income earned by non-citizens from work conducted or capital owned in the U.S. \$5,465 bn \$137.4 bn \$95.7 bn = GDP \$5,423 bn Notes: 1. Data quality for GDP are better. 2. Difference between GDP and GNP is small, ~1% for the US. However, the difference can be bigger for other countries, especially small ones. 3

4 The E collects data from numerous sources: IRS, surveys, customs, etc. Using these data, there are three ways to construct GDP data: 1.The expenditure method. 2. Income method. 3. Value added method. The expenditure method GDP = consumption + investment + govt. purchases + net exports Spending by households on: New durable goods Non-durable goods Services Spending by firms on plant, equipment (fixed investment) and building up inventories. Note: Fixed investment divided into residential and nonresidential. Government spending on goods and services. Note: Not equal to total spending, because it does not include transfer payments (e.g. welfare). ll new housing goes here, whether bought by firms, households or the government. Note that we do NOT include firm spending on materials (including intermediate processed goods sold to it by other firms) or labor. Doing so, would involve double counting, because these expenditures will also show up in consumer spending on goods that embody these intermediate inputs. = exports of goods and services minus imports 4

5 The income method The method attempts to add up the net income of all employees and business, before taxes. Composition of National Income, 1995, \$ billions Wages and salaries 4,209 labor s share, 73% Owner s income 478 Rental income 122 Corporate profits 589 Net interest earned 401 National Income 5,799 Profit s share, 27% These shares are quite stable over time. 5

6 Value added method The value added by a firm is the difference between the revenue a firm earns by selling its products and the amount it pays for the products of other firms it uses as intermediate goods. Example: firms buys \$1,000 of wheat, mills and bakes it using \$1,000 of labor. The firm sells the bread for \$2,500, making \$500 profit. The value added is \$1,500. The details of how the government calculates these measures of national income are pretty tedious. In theory all three measures should give the same value for GDP. ut in practice they can differ because of methodological complications (e.g. the treatment of taxes) and problems with data collection (e.g. some activity is not observed because of tax evasion). This can create difficulties for governments trying to work out the state of the economy, and therefore the sorts of policies they should implement. (online reading: Statistical Discrepancies in GDP ) The important feature of the measures is that they avoid double counting. Q. If I buy a computer in Pittsburgh for \$3,000, and sell it to my cousin in rkansas for \$10,000, what is the contribution to national income?. \$10,000, consisting of \$3,000 of computer equipment, and \$7,000 transportation services. 6

7 Real versus Nominal GDP To add apples to oranges we need a common unit: their value works quite nicely. In practice, the E collects data on total revenues for each type of good, surveys the prices of those goods, and then infers the quantities produced from these data. So GDP is estimated by (1) Y = p y + p y, but both quantities are inferred from (2) R R y =, y =. p p price of good quantity of good revenues: total value of sales of good Note what equation (1) means for the growth rate of income. Differentiate (1) with respect to time: Y & = p& y + p y& + p& y + p y&. We can write this as a growth rate: Y& = Y ( p& y + p y& ) + ( p& y + p y& ) p y + p y, dx x & = dt Denominator is total revenue, R +R. 7

8 which, in turn, can be written in the following form: = y y R R R y y R R R p p R R R p p R R R Y Y & & & & & = INFLTION RTE + REL GDP GROWTH weighted sum of individual price growth rates, with weights equal to the share of the good in total sales. weighted sum of individual output growth rates, with weights equal to the share of the good in total sales. NOMINL GDP GROWTH RTE This is what the E observes So, as we are really interested in real GDP growth, we need to be able to measure accurately the rate of inflation. Problems measuring inflation also imply problems in measuring real national income growth. 8

9 What GDP Does Not Measure ssume for the moment that inflation is measured accurately, and that revenues are observed without problem. Then, by assumption, we have an accurate measure of GDP growth but this is still a poor measure of the standard of living. GDP Omits: The value of leisure time. Non-marketed household production. Environmental damage. Non-economic values: peace, security, happiness, schadenfreude, etc. nd on top of this, GDP figures do not measure GDP all that well because there are problems in measuring revenues accurately measuring inflation well. So, unsurprisingly, GDP is the best measure of our national standard of living that we have. 9

10 Real Gross Domestic Product United States, Main features of real GDP performance: more or less constant rate of growth, over a period of 120 years, shown by the exponential trend line. Fluctuations around this trend, notably Recessions: the Great Depression ( ); the recessions of and associated with the oil-price increases; the recession for reasons we will explore later. ooms: periods of rapidly growing or above-trend output, notable in the two world wars, the late 1960s, and the 1990s. 10

11 These features of GDP growth leads to two distinct questions: What determines the long-run average trend rate of growth? What determines the frequency and amplitude of booms and recessions? Economists have almost invariably attacked these two questions separately. Imagine a world with no cycles, so that the trend can be studied. This is the study of economic growth. Imagine a world with no trend, so that the cycle can be studied. This is business cycle analysis. 11

12 Inflation Note absence of periods of deflation after WWII. 12

13 US Inflation Rate, Civil War Note how periods of price deflation vanished after the war War of 1812 WWI WWII Oil Price Shocks Great Depression Nixon price controls Source: Handbook of Labor Statistics, U.S. Department of Labor, ureau of Labor Statistics. 13

14 The consumer price index is a weighted sum of the prices of individual goods. The weights are equal to the relative importance of each good in consumption (the consumption share). The CPI has been under investigation in recent years (oskin Commission). It has been concluded that, for many years, the CPI has overstated increase in the cost of living. Getting the inflation rate wrong has important consequences: 1. We don t really know what is going on with real income growth: and without reliable data on GDP growth, it is hard to know what policies work and what policies do not. 2. We get the adjustment to individual index welfare payments wrong. ecause we have been overstating the rise in the cost of living, our measurement problems imply: 1. Real GDP growth has been understated. 2. The Federal government has been increasing expenditure on welfare and other transfer payments too rapidly, and making recipients better off than we intended at the cost of an increased budget deficit. 14

15 Why the CPI overstates inflation There are a number of reasons, among them: 1. Subsitution ias The CPI has traditionally studied the cost of buying a fixed basket of goods. ut individuals can offset part of the effect of rising prices by changing the goods they buy. The CPI is the answer to the question: how much money do I need to buy exactly what I bought last year? true cost of living index is the answer to the question: how much money do I need to be exactly as well off as I was last year? These are distinct questions. 15

16 n extreme example of the substitution bias: I am indifferent between chips and Doritos, but I like a bit of variety. I always eat 3 units, and I buy two of the cheaper one and one of the more expensive one. Year Chips Doritos 2001 Price per unit Quantity purchased Price per unit Quantity purchased 1 2 In 2001, I spent 100 on chips and 100 on Doritos for a total of 200, and bought 3 units in total. In 2002, I spent 100 on chips and 100 on Doritos, for a total of 200, and bought 3 units in total. The CPI asks: how much do I need in 2002 to buy exactly what I bought in 2001? The answer is: 200 to buy the 2 units of chips I had bought in 2001 but which now cost 100 each, PLUS 50 to buy the 1 unit of Doritos I had bought, which now cost 50. Total expenditure required: 250, which is 25% more than I spent in So the CPI says inflation was 25%. However, given my preferences, I can keep myself exactly as well off as before without raising my expenditure at all. The true cost of living says inflation was 0%. 16

17 2. Quality change The CPI does not do a good job of tracking improvements in quality, and introduction of new goods. For example, the best desktop computer today is about \$3,000. The best desktop in 1988 was \$3,000. re we really claiming that computers have not declined in price? In the computer case, we need to find something measurable that proxies for what we care about. For example, more clock speed allows us to do more things better, so we could use clock speed as a measure for quality. Doing this, we find that the cost of computer services (measured as cost per instruction per second) has declined at about 9% per year for 20 years. Computers are such egregious example of the quality problem that the E has actually gone and adjusted its data on computer prices. ut it has done so for very few other things: measuring quality is in most cases very hard and time-consuming to do. Jerry Hausman has studied the quality improvement caused by the proliferation of breakfast cereal brands. He concludes that we have overstated price inflation in the breakfast cereal sector by about 25 a year for over 15 years. 17

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