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In economics, nominal value refers to value measured in terms of absolute money amounts, whereas real value is considered and measured against the actual goods or services for which it can be exchanged at a given time. Real value takes into account inflation and the value of an asset in relation to its purchasing power.

In macroeconomics, the real gross domestic product compensates for inflation so economists can exclude inflation from growth figures, and see how much an economy actually grows. Nominal GDP would include inflation, and thus be higher.

Commodity bundles, price indices and inflation

A commodity bundle is a sample of goods, which is used to represent the sum total of goods across the economy to which the goods belong, for the purpose of comparison across different times (or locations).

At a single point of time, a commodity bundle consists of a list of goods, and each good in the list has a market price and a quantity. The market value of the good is the market price times the quantity at that point of time. The nominal value of the commodity bundle at a point of time is the total market value of the commodity bundle, depending on the market price, and the quantity, of each good in the commodity bundle which are current at the time.

A price index is the relative price of a commodity bundle. A price index can be measured over time, or at different locations or markets. If it is measured over time, it is a series of values $P_{t}$ over time $t$ .

A time series price index is calculated relative to a base or reference date. $P_{0}$ is the value of the index at the base date. For example, if the base date is (the end of) 1992, $P_{0}$ is the value of the index at (the end of) 1992. The price index is typically normalized to start at 100 at the base date, so $P_{0}$ is set to 100.

The length of time between each value of $t$ and the next one, is normally constant regular time interval, such as a calendar year. $P_{t}$ is the value of the price index at time $t$ after the base date. $P_{t}$ equals 100 times the value of the commodity bundle at time $t$ , divided by the value of the commodity bundle at the base date.

If the price of the commodity bundle has increased by one percent over the first period after the base date, then P₁ = 101.

The inflation rate $i_{t}$ between time $t-1$ and time $t$ is the change in the price index divided by the price index value at time $t-1$ :

$i_{t}={\frac {P_{t}-P_{t-1}}{P_{t-1}}}$

={\frac {P_{t}}{P_{t-1}}}-1

expressed as a percentage.

Real value

The nominal value of a commodity bundle tends to change over time. In contrast, by definition, the real value of the commodity bundle in aggregate remains the same over time. The real values of individual goods or commodities may rise or fall against each other, in relative terms, but a representative commodity bundle as a whole retains its real value as a constant from one period to the next.

Real values can for example be expressed in constant 1992 dollars, with the price level fixed 100 at the base date.

The price index is applied to adjust the nominal value $Q$ of a quantity, such as wages or total production, to obtain its real value. The real value is the value expressed in terms of purchasing power in the base year.

The index price divided by its base-year value $P_{t}/P_{0}$ gives the growth factor of the price index.

Real values can be found by dividing the nominal value by the growth factor of a price index. Using the price index growth factor as a divisor for converting a nominal value into a real value, the real value at time t relative to the base date is:

{\frac {P_{0}\cdot Q_{t}}{P_{t}}}

Real growth rate

The real growth rate $r_{t}$ is the change in a nominal quantity $Q_{t}$ in real terms since the previous date $t-1$ . It measures by how much the buying power of the quantity has changed over a single period.

r_{t}={\frac {P_{0}\cdot Q_{t}}{P_{t}}}{\Bigg /}{\frac {P_{0}\cdot Q_{t-1}}{P_{t-1}}}-1

={\frac {P_{t-1}\cdot Q_{t}}{P_{t}\cdot Q_{t-1}}}-1

={\frac {Q_{t}}{Q_{t-1}}}({\frac {P_{t}}{P_{t-1}}})^{-1}-1

={\frac {1+g_{t}}{1+i_{t}}}-1

where $g_{t}$ is the nominal growth rate of $Q_{t}$ , and $i_{t}$ is the inflation rate.

1+r_{t}={\frac {1+g_{t}}{1+i_{t}}}

For values of $i_{t}$ between −1 and 1 (i.e. ±100 percent), we have the Taylor series

(1+i_{t})^{-1}=1-i_{t}+i_{t}^{2}-i_{t}^{3}+...

so

1+r_{t}=(1+g_{t})(1-i_{t}+i_{t}^{2}-i_{t}^{3}+...)

=1+g_{t}-i_{t}-g_{t}i_{t}+i_{t}^{2}+{\text{higher order terms.}}

Hence as a first-order (i.e. linear) approximation,

r_{t}=g_{t}-i_{t}

Real wages and real gross domestic products

The bundle of goods used to measure the Consumer Price Index (CPI) is applicable to consumers. So for wage earners as consumers, an appropriate way to measure real wages (the buying power of wages) is to divide the nominal wage (after-tax) by the growth factor in the CPI.

Gross domestic product (GDP) is a measure of aggregate output. Nominal GDP in a particular period reflects prices that were current at the time, whereas real GDP compensates for inflation. Price indices and the U.S. National Income and Product Accounts are constructed from bundles of commodities and their respective prices. In the case of GDP, a suitable price index is the GDP price index. In the U.S. National Income and Product Accounts, nominal GDP is called GDP in current dollars (that is, in prices current for each designated year), and real GDP is called GDP in [base-year] dollars (that is, in dollars that can purchase the same quantity of commodities as in the base year).

Example

If for years 1 and 2 (possibly a span of 20 years apart), the nominal wage and price level P of goods are respectively

nominal wage rate: $10 in year 1 and $16 in year 2

price level: 1.00 in year 1 and 1.333 in year 2,

then real wages using year 1 as the base year are respectively:

$10 (= $10/1.00) in year 1 and $12 (= $16/1.333) in year 2.

The real wage each year measures the buying power of the hourly wage in common terms. In this example, the real wage rate increased by 20 percent, meaning that an hour's wage would buy 20% more goods in year 2 compared with year 1.

Real interest rates

As was shown in the section above on the real growth rate,

1+r_{t}={\frac {1+g_{t}}{1+i_{t}}}

where

r_{t}

is the rate of increase of a quantity in real terms,

g_{t}

is the rate of increase of the same quantity in nominal terms, and

i_{t}

is the rate of inflation,

and as a first-order approximation,

r_{t}=g_{t}-i_{t}.

In the case where the growing quantity is a financial asset, $g_{t}$ is a nominal interest rate and $r_{t}$ is the corresponding real interest rate; the first-order approximation $r_{t}=g_{t}-i_{t}$ is known as the Fisher equation.^[1]

Looking back into the past, the ex post real interest rate is approximately the historical nominal interest rate minus inflation. Looking forward into the future, the expected real interest rate is approximately the nominal interest rate minus the expected inflation rate.

Cross-sectional comparison

Not only time-series data, as above, but also cross-sectional data which depends on prices which may vary geographically for example, can be adjusted in a similar way. For example, the total value of a good produced in a region of a country depends on both the amount and the price. To compare the output of different regions, the nominal output in a region can be adjusted by repricing the goods at common or average prices.

Notes

^ Benninga, Simon; Oded Sarig (1997). Corporate Finance: A Valuation Approach. The McGraw-Hill Companies. pp. 21. ISBN 0-07-005099-6.

References

Diewert, W. E. (2008) [1987]. "Index Numbers". The New Palgrave Dictionary of Economics (2nd ed.). pp. 1–32. doi:10.1057/978-1-349-95121-5_940-2. ISBN 978-1-349-95121-5.
O'Donnell, R. (1987). "Real and Nominal Quantities". The New Palgrave: A Dictionary of Economics. Vol. v. 4. pp. 97–98. (Adam Smith's early distinction vindicated)
Sen, Amartya (1979). "The Welfare Basis of Real Income Comparisons: A Survey". Journal of Economic Literature. 17 (1): 1–45. JSTOR 2723639.
Usher, D. (1987). "Real Income". The New Palgrave: A Dictionary of Economics. Vol. v. 4. pp. 104–05.

External links

[1] Benninga, Simon; Oded Sarig (1997). Corporate Finance: A Valuation Approach. The McGraw-Hill Companies. pp. 21. ISBN 0-07-005099-6.

[1]

@@ Line 1: / Line 1: @@
+{{Short description|Value in economics and accounting}}
-{{otheruses|Real versus nominal value}}
 {{Economics sidebar}}
-In [[economics]], '''nominal''' value is measured in terms of money, whereas '''real''' value is measured against goods or services. A real value is one which has been adjusted for [[inflation]], enabling comparison of quantities as if the prices of goods had not changed on average. Changes in value '''in real terms''' therefore include the effect of inflation. In contrast with a real value, a nominal value has not been adjusted for inflation, and so changes in nominal value reflect at least in part the effect of inflation.
+In [[economics]], '''nominal''' '''value''' refers to value measured in terms of absolute [[money]] amounts, whereas '''real value''' is considered and measured against the actual [[goods or services]] for which it can be exchanged at a given time. Real value takes into account inflation and the [[Value (economics)|value]] of an asset in relation to its [[purchasing power]].
+In macroeconomics, the [[real gross domestic product]] compensates for inflation so economists can exclude inflation from growth figures, and see how much an economy actually grows. Nominal GDP would include inflation, and thus be higher.
-==Prices and inflation==
+==Commodity bundles, price indices and inflation==
-A representative collection of [[good (economics)|goods]], or '''commodity bundle''', is used for comparison purposes, to measure inflation. The '''nominal''' (unadjusted) value of the commodity bundle in a given year depends on prices current at the time, whereas the real value of the commodity bundle, if it is truly representative, in aggregate remains the same. The real values of individual goods or commodities may rise or fall against each other, in relative terms, but a representative commodity bundle as a whole retains its real value as a constant over time.
+A '''commodity bundle''' is a sample of [[good (economics)|goods]], which is used to represent the sum total of goods across the economy to which the goods belong, for the purpose of comparison across different times (or locations).
-A price index is calculated relative to a '''base''' year. Indices are typically normalized at 100 in the base year. Starting from a base (or reference) year, a [[price index]] ''P<sub>t</sub>'' represents the price of the commodity bundle over time ''t''. In base year zero, ''P''<sub>0</sub> is set to 100. If for example the base year is 1992, real values are expressed in [[constant dollars|constant 1992 dollars]], with the price level defined as 100 for 1992. If, for example, the price of the commodity bundle has increased in the first year by 1%, then ''P<sub>t</sub>'' rises from ''P''<sub>0</sub> = 100 to ''P''<sub>1</sub> = 101.
+At a single point of time, a commodity bundle consists of a list of goods, and each good in the list has a market price and a quantity. The market value of the good is the market price times the quantity at that point of time. The '''nominal''' value of the commodity bundle at a point of time is the total market value of the commodity bundle, depending on the market price, and the quantity, of each good in the commodity bundle which are current at the time.
-The inflation rate <math>i_t</math> between year ''t'' - 1 and year ''t'' is:
+A [[price index]] is the relative price of a commodity bundle. A price index can be measured over time, or at different locations or markets. If it is measured over time, it is a series of values <math>P_t</math> over time <math>t</math>.
-:change in price / price in year ''t'' - 1
+A [[time series]] price index is calculated relative to a '''base''' or '''reference''' date. <math>P_0</math> is the value of the index at the base date. For example, if the base date is (the end of) 1992, <math>P_0</math> is the value of the index at (the end of) 1992. The price index is typically '''normalized''' to start at 100 at the base date, so <math>P_0</math> is set to 100.
-:<math>= \frac{P_t-P_{t-1}}{P_{t-1}} * 100</math>
+The length of time between each value of <math>t</math> and the next one, is normally constant regular time interval, such as a calendar year. <math>P_t</math> is the value of the price index at time <math>t</math> after the base date. <math>P_t</math> equals 100 times the value of the commodity bundle at time <math>t</math>, divided by the value of the commodity bundle at the base date.
-:<math>= (\frac{P_t}{P_{t-1}} - 1 )  *100</math>
+If the price of the commodity bundle has increased by one percent over the first period after the base date, then ''P''<sub>1</sub> = 101.
+The '''inflation rate''' <math>i_t</math> between time <math>t-1</math> and time <math>t</math> is the change in the price index divided by the price index value at time <math>t-1</math>:
+<math>i_t = \frac{P_t-P_{t-1}}{P_{t-1}}</math>
+:<math>= \frac{P_t}{P_{t-1}} - 1</math>
+expressed as a percentage.
 ==Real value==
+The nominal value of a commodity bundle tends to change over time. In contrast, by definition, the '''real value''' of the commodity bundle in aggregate remains the same over time. The real values of individual goods or commodities may rise or fall against each other, in relative terms, but a representative commodity bundle as a whole retains its real value as a constant from one period to the next.
+Real values can for example be expressed in [[constant dollars|constant 1992 dollars]], with the price level fixed 100 at the base date.
 [[File:U.S. Real and Nominal Gas Prices 1996 to 2016 - v1.png|thumb|400px|Comparison of real and nominal gas prices 1996 to 2016, illustrating the formula for conversion. Here the base year is 2016.]]
-The price index is applied to adjust the nominal value ''Q'' of a quantity, such as wages or total production, to obtain its real value. The real value is the value expressed in terms of [[purchasing power]] in the base year.
+The price index is applied to adjust the nominal value <math>Q</math> of a quantity, such as wages or total production, to obtain its real value. The real value is the value expressed in terms of [[purchasing power]] in the base year.
-The index price divided by its base-year value, <math>P_t / P_0,</math> gives the growth factor of the price index.
+The index price divided by its base-year value <math>P_t / P_0</math> gives the growth factor of the price index.
-Real values can be found by dividing the nominal value by the growth factor of a price index. Using the price index growth factor as a divisor for converting a nominal value into a real value, the real value in year ''t'' relative to the base year 0 is:
+Real values can be found by dividing the nominal value by the growth factor of a price index. Using the price index growth factor as a divisor for converting a nominal value into a real value, the real value at time ''t'' relative to the base date is:
 :<math>\frac{P_0 \cdot Q_t}{P_t}</math>
@@ Line 30: / Line 44: @@
 ==Real growth rate==
-The real growth rate <math>r_t</math> is the change from one period to the next of a nominal quantity <math>Q_t</math> in real terms. It measures by how much the buying power of the quantity has changed.
+The real growth rate <math>r_t</math> is the change in a nominal quantity <math>Q_t</math> in real terms since the previous date <math>t-1</math>. It measures by how much the buying power of the quantity has changed over a single period.
+:<math>r_t = \frac{P_0 \cdot Q_t}{P_t} \Bigg/ \frac{P_0 \cdot Q_{t-1}}{P_{t-1}} - 1</math>
-:<math>r_t = \frac{P_0 \cdot Q_t}{P_t} / \frac{P_0 \cdot Q_{t-1}}{P_{t-1}} - 1</math>
 ::<math>= \frac{P_{t-1} \cdot Q_t}{P_t \cdot Q_{t-1}} - 1</math>
-::<math>= \frac{Q_t}{Q_{t-1}} / \frac{P_t}{P_{t-1}} - 1</math>
+::<math>= \frac{Q_t}{Q_{t-1}} (\frac{P_t}{P_{t-1}})^{-1} - 1</math>
 ::<math>= \frac{1 + g_t}{1 + i_t} - 1</math>
+where <math>g_t</math> is the nominal growth rate of <math>Q_t</math>, and <math>i_t</math> is the inflation rate.
-where:
-:<math>g_t</math> is the nominal growth rate of <math>Q_t</math>,
-and:
-:<math>i_t</math> is the inflation rate.
 :<math>1 + r_t = \frac{1 + g_t}{1 + i_t}</math>
-For values of <math>i_t</math> between -1 and 1, we have the [[Taylor series]]
+For values of <math>i_t</math> between −1 and 1 (i.e. ±100 percent), we have the [[Taylor series]]
 :<math>(1 + i_t)^{-1} = 1 - i_t + i_t^2 - i_t^3 + ...</math>
@@ Line 65: / Line 72: @@
 :<math>r_t = g_t - i_t</math>
-==Real wages and real gross domestic product==
+==Real wages and real gross domestic products==
 The bundle of goods used to measure the [[Consumer Price Index]] (CPI) is applicable to consumers. So for wage earners as consumers, an appropriate way to measure real wages (the buying power of wages) is to divide the nominal wage (after-tax) by the growth factor in the CPI.
-[[Gross domestic product]] (GDP) is a measure of aggregate output. Nominal GDP in a particular period reflects prices which were current at the time, whereas real GDP compensates for inflation. Price indices and the U.S. [[National Income and Product Accounts]] are constructed from bundles of commodities and their respective prices. In the case of GDP, a suitable price index is the [http://bea.gov/bea/glossary/glossary.cfm?key_word=GDP_price_index&letter=G#GDP_price_index GDP price index.] In the U.S. National Income and Product Accounts, nominal GDP is called  ''GDP in current dollars'' (that is, in prices current for each designated year), and real GDP is called ''GDP in [base-year] dollars'' (that is, in dollars that can [[GDP deflator#Calculation|purchase]] the same quantity of commodities as in the base year).
+[[Gross domestic product]] (GDP) is a measure of aggregate output. Nominal GDP in a particular period reflects prices that were current at the time, whereas real GDP compensates for inflation. Price indices and the U.S. [[National Income and Product Accounts]] are constructed from bundles of commodities and their respective prices. In the case of GDP, a suitable price index is the [http://bea.gov/bea/glossary/glossary.cfm?key_word=GDP_price_index&letter=G#GDP_price_index GDP price index.] In the U.S. National Income and Product Accounts, nominal GDP is called  ''GDP in current dollars'' (that is, in prices current for each designated year), and real GDP is called ''GDP in [base-year] dollars'' (that is, in dollars that can [[GDP deflator#Calculation|purchase]] the same quantity of commodities as in the base year).
 ==Example==
@@ Line 102: / Line 109: @@
 :<math>r_t = g_t - i_t.</math>
-In the case where the growing quantity is a [[financial asset]], <math>g_t</math> is a [[nominal interest rate]] and <math>r_t</math> is the corresponding [[real interest rate]]; the first-order approximation <math>r_t = g_t - i_t</math> is known as the [[Fisher equation]].<ref>{{cite book | last=Benninga | first=Simon |author2=Oded Sarig  | year=1997 | title=''Corporate Finance: A Valuation Approach'' | publisher=[[The McGraw-Hill Companies]] | pages=21 | isbn=0-07-005099-6 |url=https://books.google.com/books?id=rfxhNAEACAAJ&pg=PA21 }}</ref>
+In the case where the growing quantity is a [[financial asset]], <math>g_t</math> is a [[nominal interest rate]] and <math>r_t</math> is the corresponding [[real interest rate]]; the first-order approximation <math>r_t = g_t - i_t</math> is known as the [[Fisher equation]].<ref>{{cite book | last=Benninga | first=Simon |author2=Oded Sarig  | year=1997 | title=''Corporate Finance: A Valuation Approach'' | publisher=[[The McGraw-Hill Companies]] | pages=[https://archive.org/details/corporatefinance00benn/page/21 21] | isbn=0-07-005099-6 |url=https://archive.org/details/corporatefinance00benn | url-access=registration }}</ref>
 Looking back into the past, the [[Ex post#ex post|''ex post'']] real interest rate is approximately the historical nominal interest rate minus inflation. Looking forward into the future, the expected real interest rate is approximately the nominal interest rate minus the expected inflation rate.
@@ Line 108: / Line 115: @@
 ==Cross-sectional comparison==
-Not only [[time-series]] data, as above, but also [[cross-section data]] which depends on prices which may vary geographically for example, can be adjusted in a similar way. For example, the total value of a good produced in a region of a country depends on both the amount and the price. To compare the output of different regions, the nominal output in a region can be adjusted by repricing the goods at common or average prices.
+Not only [[time-series]] data, as above, but also [[cross-sectional data]] which depends on prices which may vary geographically for example, can be adjusted in a similar way. For example, the total value of a good produced in a region of a country depends on both the amount and the price. To compare the output of different regions, the nominal output in a region can be adjusted by repricing the goods at common or average prices.
 ==See also==
@@ Line 122: / Line 129: @@
 *[[Inflation]]
 *[[Inflation accounting]]
+*[[Inflation hedge]]
 *[[Interest]]
 *[[Money illusion]]
@@ Line 136: / Line 144: @@
 ==References==
-*{{cite book |first=W. E. |last=Diewert |chapter=Index Numbers |orig-year=1987 |year=2008 |title=[[The New Palgrave Dictionary of Economics]] |edition=2nd |chapterurl=https://link.springer.com/referenceworkentry/10.1057/978-1-349-95121-5_940-2 }}
+*{{cite book |first=W. E. |last=Diewert |author-link=Walter Erwin Diewert |chapter=Index Numbers |orig-year=1987 |year=2008 |title=The New Palgrave Dictionary of Economics |pages=1–32 |edition=2nd |doi=10.1057/978-1-349-95121-5_940-2 |title-link=The New Palgrave Dictionary of Economics |isbn=978-1-349-95121-5 }}
 *{{cite book |first=R. |last=O'Donnell |year=1987 |chapter=Real and Nominal Quantities |title=The New Palgrave: A Dictionary of Economics |volume=v. 4 |pages=97–98 }} ([[The Wealth of Nations|Adam Smith]]'s early distinction vindicated)
-*{{cite journal |first=Amartya |last=Sen |authorlink=Amartya Sen |year=1979 |title=The Welfare Basis of Real Income Comparisons: A Survey |journal=[[Journal of Economic Literature]] |volume=17 |issue=1 |pages=1–45 |jstor=2723639 }}
+*{{cite journal |first=Amartya |last=Sen |author-link=Amartya Sen |year=1979 |title=The Welfare Basis of Real Income Comparisons: A Survey |journal=[[Journal of Economic Literature]] |volume=17 |issue=1 |pages=1–45 |jstor=2723639 }}
 *{{cite book |first=D. |last=Usher |year=1987 |chapter=Real Income |title=The New Palgrave: A Dictionary of Economics |volume=v. 4 |pages=104–05 }}
@@ Line 146: / Line 154: @@
 {{economics}}
+{{United States – Commonwealth of Nations recessions}}
 [[Category:Inflation]]

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