<p>The GDP deflator is, by definition, the price of real GDP.
<span class="math-container">$$
GDP(nominal) = Price \times GDP(real)
$$</span>
It is an index that is equal to 1 (or sometimes quoted as 100) in the base year. That means in particular that nominal GDP is the same as real GDP in the base year.</p>
<p><strong>Deflating</strong> nominal GDP means removing the price (or nominal) effect from GDP, leaving you with GDP in volumes (or real GDP). More specifically, nominal GDP is divided by the price index.</p>
<p>Unlike the text in green suggests, this independent of how exactly prices have been moving. To get real GDP, nominal GDP always needs to be <em>deflated</em>. It's a technical term. And there is really not much you can say about real GDP by just looking at prices. Irrespective of how prices move, real GDP can be growing or falling. To be able to say anything, you would need also information about either nominal or real GDP. In other words, you can solve the equation above for real or nominal GDP only if, in addition to prices, you have info about the other.</p>

CC BY-SA 4.0
2021-11-03T16:00:22.933Z
2021-11-03T16:00:22.933Z
BrsG
<p>Nominal GDP measures the total values of goods and services in terms of <strong>total amount</strong> of money whereas real GDP measures the <strong>purchasing power</strong> of the money, which is what we care about more. So we subtract the inflation from the nominal GDP to find the actual real GDP.</p>

CC BY-SA 4.0
2021-11-07T06:30:22.710Z
2021-11-07T06:30:22.710Z
Shisham Adhikari
<p>I am confused at the explanation below which explains why nominal GDP must be deflated to get real GDP. I thought the GDP deflator would decrease if prices are declining, so how does this result in nominal GDP being &quot;deflated&quot;?</p>
<p>Cheers</p>
<p><a href="https://i.sstatic.net/L5M90.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/L5M90.png" alt="enter image description here" /></a></p>

<macroeconomics><nonexpert>
Why is nominal GDP deflated to get real GDP?
tarren
# Why is nominal GDP deflated to get real GDP?

(Asked by: username_0 on 2021-10-27)

I am confused at the explanation below which explains why nominal GDP must be deflated to get real GDP. I thought the GDP deflator would decrease if prices are declining, so how does this result in nominal GDP being "deflated"?

Cheers

[![enter image description here](https://i.sstatic.net/L5M90.png)](https://i.sstatic.net/L5M90.png)

**Tags:** macroeconomics, nonexpert

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## 2 answers

### Answer by username_1 on 2021-11-03. Score: 1

The GDP deflator is, by definition, the price of real GDP.
$$
GDP(nominal) = Price \times GDP(real)
$$
It is an index that is equal to 1 (or sometimes quoted as 100) in the base year. That means in particular that nominal GDP is the same as real GDP in the base year.

**Deflating** nominal GDP means removing the price (or nominal) effect from GDP, leaving you with GDP in volumes (or real GDP). More specifically, nominal GDP is divided by the price index.

Unlike the text in green suggests, this independent of how exactly prices have been moving. To get real GDP, nominal GDP always needs to be *deflated*. It's a technical term. And there is really not much you can say about real GDP by just looking at prices. Irrespective of how prices move, real GDP can be growing or falling. To be able to say anything, you would need also information about either nominal or real GDP. In other words, you can solve the equation above for real or nominal GDP only if, in addition to prices, you have info about the other.


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### Answer by username_2 on 2021-11-07. Score: 0

Nominal GDP measures the total values of goods and services in terms of **total amount** of money whereas real GDP measures the **purchasing power** of the money, which is what we care about more. So we subtract the inflation from the nominal GDP to find the actual real GDP.


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