THE IDEA IN ONE LINE
More bread and pricier bread are different things.
More bread? Or more expensive bread?
Loaves made
5 more loaves
Price per loaf
$2 more per loaf
Two different changes. One bigger money total.
You read that the economy is worth more than last year. Does that mean it produced more useful things? Sometimes. But higher prices can make the total look bigger too.
To see the difference, imagine an economy with just one bakery. It makes one kind of finished loaf, and every loaf is sold.
More bread, higher prices
In the first year, the bakery makes 100 loaves. Each costs $10.
In the next year, it makes 105 loaves. Each costs $12.
Two things changed: the bakery made five more loaves, and each loaf became more expensive.
A bigger money total can come from more things, higher prices, or both.
The money total includes both changes
The value of the bread rises from $1,000 to $1,260. That is a much bigger jump than the five extra loaves alone.
The extra money reflects both the additional bread and the higher price per loaf.
Count the bread, not just the money
To focus on production, pretend the price stayed at $10 in both years. The five extra loaves would still be there, but the price rise would no longer inflate the comparison.
This is the idea behind adjusting an economic total for prices.
Two names you will see in the news
- Nominal GDP: the value of production at the prices charged at the time.
- Real GDP: production adjusted for price changes, to help show whether more was made.
GDP adds up the value of the final goods and services produced in an economy over a period of time. Our bakery is a tiny teaching example, not a complete GDP calculation.
A real economy has many products and services, and official calculations are more detailed. A growth headline also does not tell you how the benefits are shared.
Optional: see the calculation
First year: 100 loaves × $10 = $1,000
Next year: 105 loaves × $12 = $1,260
At the old price: 105 loaves × $10 = $1,050
The money total grows by 26%. The number of loaves grows by 5%, while the price grows by 20%. Those last two rates combine through multiplication, so they do not simply add up to 25%.
1.05 × 1.20 = 1.26
Source: U.S. Bureau of Economic Analysis: understanding GDP.
All figures are hypothetical. This bakery helps show the idea. Real GDP statistics use more detailed methods to cover many different products and services.