4.5: Nominal GDP, real GDP and the GDP deflator (2024)

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    We have used real GDP to measure growth and the growth rate in the beginning of this chapter, and then nominal GDP as recorded in the National Accounts. Now we need to look carefully at both concepts and the relationship between them, which is the GDP deflator, a measure of the general price level. Nominal GDP measures output and incomes based on current market prices for goods and services and factors of production. As a result, changes in nominal GDP from one period to the next might be the result of changes in prices of final outputs and factor inputs, or the result of changes in the quantities of final outputs and factor inputs, or some combination of the two. Since it is physical quantities of goods and services that yield satisfaction or utility, it can be misleading to judge the economy's performance by looking at nominal GDP. For that purpose we need real GDP, as we discussed earlier in this chapter. Real GDP, or GDP in constant prices, measures the value of goods and services produced in any given year using the prices of a base year. In this way, real GDP adjusts changes in GDP for changes in prices by measuring GDP in different years in constant prices.

    Table 4.4 Nominal and real GDP

    2007 2017 % change
    Quantity blue jeans 4,000 5,000 25
    solar panels 2,000 4,000 100
    Price in current $ blue jeans 25 50 100
    solar panels 100 60 –40
    Current value blue jeans 100,000 250,000 150
    solar panels 200,000 240,000 20
    Nominal GDP 300,000 490,000 63
    Value in 2007 $ blue jeans 100,000 125,000 25
    solar panels 200,000 400,000 100
    Real GDP 300,000 525,000 75
    GDP deflator 100 93.3 6.7

    To illustrate this important point, Table 4.4 shows a simple economy that produces both consumer goods, blue jeans, and capital goods, solar panels. In this economy nominal GDP rises from $300,000 to $490,000 between 2007 and 2017, a 63 percent increase measured in current prices as a result of changes in both quantities and prices. If we take 2007 as the base year, we can measure real GDP in 2017 by valuing output quantities in 2017 using 2007 prices. This gives real GDP in 2017 of $525,000 in prices of the base year. In the example in the table, quantities of both products rise over the period but the price of blue jeans rises while the price of solar panels falls. As a result the rise of about 75 percent in real GDP gives a true picture of the extra quantity of goods available in the economy in 2017 compared with 2007. It eliminates the change in nominal GDP that was the result of the fall in the average price level by 6.7 percent between 2007 and 2017 as a result of the fall in the price of solar panels.

    The GDP deflator

    The Canadian economy is obviously more complex than this economy. We have seen that GDP includes expenditures by households, governments, businesses, and residents of other countries who supply us with imports and buy our exports. To convert nominal GDP to real GDP we need to use an index that includes what is happening to the prices of all these different goods and services. This index is called the GDP deflator.

    GDP deflator: index of current final output prices relative to base year prices.

    If we have data for both nominal and real GDP, we can calculate the GDP deflator as the ratio of nominal GDP to real GDP expressed as an index with a value of 100 in the base year.

    4.5: Nominal GDP, real GDP and the GDP deflator (2) (4.8)

    The GDP deflator differs from the consumer price index (CPI) illustrated in Example Box 4.1 and used to measure inflation in consumer prices and the cost of living. First, the CPI is based on a "representative basket" of goods and services that consumers buy, while the GDP deflator is comprehensive and covers all the goods and services included in national accounts. Second, the CPI changes over time with changes in the prices of the basket of consumer goods and services. The GDP deflator, by contrast, is built on the base year prices. It changes over time as the current prices change relative to base year prices. In other words the GDP deflator is used to "deflate" the dollar value of current 2017 output to what value it would be in 2007 prices, while the CPI measures the increase in the cost of the "basket" of consumer goods and services.

    But why does the GDP deflator change over time? From our earlier discussion of the national income accounting framework, we can see that costs of production and net indirect taxes are included in the general level of market prices measured by the GDP deflator. Nominal GDP measured by the income approach is reported in Table 4.3. It is the sum of incomes paid to factor inputs to production, plus depreciation allowances and net indirect taxes. These components of nominal GDP are the costs of production, gross profits, and taxes that are built into the market prices of the goods and services.

    The general price level in the economy is the dollar amount paid for a 'unit of output' and, subtracting indirect taxes, the revenue received by producers for the sale of 'unit of output'. Revenue per unit of output must cover costs per unit of output, including expected profit, for producers to be willing to continue operations. Changes in costs must be covered eventually by changes in prices. Or if market conditions raise prices—think about crude oil production or lumber production—producers will increase output, as long as higher prices cover higher costs.

    Summarizing from the national accounts gives three components of cost per unit of output:

    1. employee compensation per unit of output, W/Y;
    2. gross business income per unit of output, (GCS+GMI)/Y; and
    3. net indirect tax per unit of output, 4.5: Nominal GDP, real GDP and the GDP deflator (3).

    Changes in the sum of these three components of the price level must change both price and nominal GDP, whether we measure nominal GDP by the income or the expenditure approach. The GDP deflator is an index of this price level in any particular year relative to a chosen base year. However, the accounting framework does not explain the causes of change in the price level. That requires explanations of changes in unit labour costs, of producer output and pricing decisions and information on the net indirect tax rate. Those explanations are parts of an economic model of the supply side of the economy.

    To show the empirical importance of the distinction between real and nominal GDP, Table 4.5 gives Canadian data over the period 2004 to 2016. Nominal GDP rose from $1,331 billion in 2004 to $2,027 billion in 2016. Without knowing what happened to prices of goods and services in general, we cannot judge what happened to the quantity of output over that period. To answer this question we use the GDP deflator to convert nominal GDP to real GDP in the prices of the base year 2007 as follows:

    4.5: Nominal GDP, real GDP and the GDP deflator (4) (4.9)

    Table 4.5 Canadian nominal and real GDP 2004–2016

    2004 2008 2012 2016
    Nominal GDP (billions $) 1,331 1,653 1,823 2,027
    GDP deflator (2007=100) 91.4 104.0 109.2 112.9
    Real GDP (billions 2007 $) 1,456 1,589 1,669 1,796

    Source: Statistics Canada, CANSIM Tables 380-0064 and 380-0066

    For example, in 2016, nominal GDP was $2,027 billion and the GDP deflator (4.5: Nominal GDP, real GDP and the GDP deflator (5)) was 112.9. Real GDP measured in constant 2007 dollars was then:

    4.5: Nominal GDP, real GDP and the GDP deflator (6)

    When converted to constant dollars, the change in real GDP is much smaller than the change in nominal GDP. Over the 2004–2016 period shown in the table, real GDP increased by 23.4 percent compared to a 52.3 percent increase in nominal GDP. On average, prices in 2016 were 23.5 percent higher than in 2004. Clearly, it is important to distinguish between nominal and real GDP.

    4.5: Nominal GDP, real GDP and the GDP deflator (2024)

    FAQs

    How to calculate real GDP, nominal GDP, and GDP deflator? ›

    Divide the nominal GDP by the GDP deflator and multiply by 100. This will give you the real GDP.

    What is the relationship between real GDP and nominal GDP and GDP deflator? ›

    Real GDP is calculated by dividing nominal GDP by a GDP deflator. Unlike real GDP, nominal GDP uses current market prices and doesn't factor inflation into its calculation.

    What is the GDP deflator if nominal GDP 5000 and real GDP 4000? ›

    Answer and Explanation:

    Based on the information given, the nominal GDP is $5,000 and the real GDP is $4,000. Let us input the information in the formula. The GDP Deflator is A. 125.

    What if nominal GDP 2.5 trillion and the GDP deflator is 125? ›

    The Real GDP can be determined by dividing the Nominal GDP ($2.5 Trillion) by the GDP deflator and then multiplying by 100. The GDP deflator is an index that measures the level of prices in the economy relative to a base year. So the calculation would be: (2.5 trillion / 125) * 100 = $2 trillion.

    What is the formula to calculate GDP? ›

    Accordingly, GDP is defined by the following formula: GDP = Consumption + Investment + Government Spending + Net Exports or more succinctly as GDP = C + I + G + NX where consumption (C) represents private-consumption expenditures by households and nonprofit organizations, investment (I) refers to business expenditures ...

    What is the correct formula for GDP deflator? ›

    The formula implies that dividing the nominal GDP by the real GDP and multiplying it by 100 will give the GDP Deflator, hence "deflating" the nominal GDP into a real measure.

    What is real GDP if nominal GDP is $7 million and the GDP deflator is 140? ›

    If nominal GDP is $7 million and the GDP deflator is 140, real GDP equals ______. d. To calculate real GDP: ($7,000,000/140) × 100 = $5,000,000.

    What is the GDP deflator if nominal GDP is 8 trillion and real GDP is 10 trillion? ›

    The correct answer is (a.) 80, and this indicates that the price level has decreased by 20 percent since the base year. It implies that a 20%-price level decrease has taken place since the base year.

    How to calculate real GDP growth? ›

    Real GDP can be calculated by taking the difference between the most recent year's real GDP and the prior year's real GDP. Then, divide this difference by the prior year's real GDP. Alternatively, real GDP can be determined if nominal GDP and the prevailing inflation rate are known.

    What is the GDP deflator if real GDP is 12 trillion and nominal GDP is 15 trillion? ›

    The GDP deflator is nominal GDP/real GDP times 100. In this case, 15/12 * 100 = 125. Tariffs can be thought of as indirect: -special taxes on domestic producers.

    How do you calculate real GDP if nominal GDP is 1200 and price index is 120? ›

    Real GDP = Nominal GDPPrice Index×100 ⇒ 1200120×100=Rs 1,000.

    What happens if real GDP is 50 and nominal GDP is 100? ›

    If real GDP is 50 and nominal GDP is 100, the GDP price index is 200.

    How to calculate nominal GDP of two products? ›

    Ok, now that definitions have been properly acknowledged, in the case of a simplified model with two goods/services, you can calculate the nominal GDP by multiplying the price of the good and its quantity. Let it be two goods, burgers (B) and fries (F) in an economy. Where Q = quantity and P = price.

    How real GDP is calculated multiplying nominal GDP by the GDP deflator? ›

    Answer and Explanation:

    Real GDP is calculated by dividing the nominal GDP by the GDP deflator and multiplying it by hundred. Thus, Real GDP is nominal GDP divided by GDP deflator multiplied by 100.

    What is the formula for deflation? ›

    The rate of deflation can be calculated like this: Look at the price index of the current year (CPIc) and the price index of the previous year (CPIp). Subtract the current year (CPIc) from the previous year (CPIp). Divide the result by the CPI from the previous period.

    What is the difference between real GDP and nominal GDP? ›

    Key Takeaways

    Nominal GDP is the total value of all goods and services produced in a given time period, usually quarterly or annually. Real GDP is nominal GDP adjusted for inflation. Real GDP is used to measure the actual growth of production without any distorting effects from inflation.

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