Real Value
What is Real Value?
Real values are nominal figures adjusted for price changes, so they are stated in the prices of one base year and reflect quantities rather than inflation.
Converting a nominal figure to real terms means dividing it by a price index written as a decimal, a step called deflating. What survives is the part of the change that came from producing or buying more, with the price effect stripped out, so real GDP growth measures output and real wage growth measures purchasing power. Every real series is quoted in the prices of a particular base year, which is why a phrase like in base-year dollars follows the number. Because the deflator is itself an estimate, real figures carry more measurement uncertainty than nominal ones and get revised whenever price indexes are revised. Comparing output, wages or living standards across years is the situation where nominal numbers give the wrong answer and real numbers give the right one.
Real Value: a worked example
Suppose an economy has nominal GDP of 550 billion dollars and a GDP price index of 110, with the base year set to 100. Real GDP is 550 ÷ (110 ÷ 100) = 500 billion in base-year prices. The next year nominal GDP is 577.5 billion and the index is 112.2, so real GDP is 577.5 ÷ 1.122 = 514.7 billion. Nominal output rose 5 percent while real output rose about 2.9 percent ((514.7 - 500) ÷ 500 = 0.029), and the gap is the 2 percent rise in prices. Deflating is the step that separates the two.
The mistake students make with real value
Students subtract the inflation rate from the nominal growth rate and treat the answer as exact. Subtraction is an approximation that holds only for small rates; the exact method divides the nominal value by the price index. With 5 percent nominal growth and 2 percent inflation, subtraction gives 3 percent while the exact figure is about 2.9 percent. The gap widens quickly when inflation is high, so deflate rather than subtract.
Real Value questions
How do you convert nominal values to real values?
Divide the nominal amount by the price index for that period expressed as a decimal, meaning the index divided by 100. A nominal 60,000 dollars when the index stands at 120 becomes 60,000 ÷ 1.20 = 50,000 dollars in base-year prices. The answer is stated in the prices of whatever year the index uses as its base.
Why is real GDP better than nominal GDP for comparing years?
Real GDP holds prices constant, so a change in it reflects a change in the quantity of goods and services produced rather than inflation. Nominal GDP can rise in a year when production actually fell. For any question about output growth or living standards over time, the real series is the one to use.
Does real always mean adjusted for inflation?
Yes, in economics the word real signals that a figure has been adjusted for price changes, whether it describes GDP, wages, interest rates or income. The adjustment involves dividing by a price index or, as an approximation, subtracting an inflation rate. Nominal is the matching term for the unadjusted figure.
Formula / Example
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