When discussing prices and values in economics, it’s essential to distinguish between nominal prices and real prices.
The key difference lies in how they account for the effects of inflation.
A. Nominal Prices
A nominal price is the current price of a good or service at the time of purchase. It’s the face value of an item, expressed in terms of the currency of the day (e.g., dollars, euros, yen). When you look at the price tag on an item in a store, you’re seeing its nominal price.
Key Characteristic: Nominal prices do not account for inflation. They reflect the absolute amount of money you pay at a specific point in time.
B. Real Prices
A real price is a nominal price that has been adjusted for inflation. It measures the value of a good or service in terms of its purchasing power, allowing for a meaningful comparison of prices across different time periods. To calculate the real price, you need to use a price index, such as the Consumer Price Index (CPI), to “deflate” the nominal price.
Key Characteristic: Real prices account for changes in the general price level, providing a truer picture of the relative value of a good or service over time.
Illustrative Example: The Price of a Gallon of Milk
Imagine that in 1980, a gallon of milk cost $2.00. This is the nominal price. Today, a gallon of milk costs $4.00. This is the current nominal price.
At first glance, it might seem like the price of milk has doubled. However, to understand the true change in cost, we must account for inflation. If we use a price index to adjust the 1980 price to today’s dollars, we might find that $2.00 in 1980 had the same purchasing power as, say, $5.00 today.
In this scenario:
The nominal price of milk increased from $2.00 to $4.00. The real price of milk actually decreased because the nominal price of $4.00 today is less than the inflation-adjusted equivalent of the 1980 price ($5.00). In real terms, milk is cheaper today than it was in 1980.
Why the Distinction between Real Prices and Nominal Prices Matters?
The difference between nominal and real prices is crucial for a variety of economic analyses, including:
1. Economic Growth: Economists use real GDP to measure the growth of an economy’s output, as opposed to nominal GDP, which can be inflated by rising prices. Real GDP provides a more accurate picture of whether an economy is producing more goods and services.
2. Wages and Income: When comparing your salary over time, it’s more important to look at your real wages (nominal wages adjusted for inflation) to see if your purchasing power has actually increased. If your nominal wage goes up by 3% but inflation is 5%, your real wage has actually decreased.
3. Interest Rates: The real interest rate (nominal interest rate minus the inflation rate) tells you the true return on an investment or the true cost of borrowing, in terms of purchasing power.