I noticed that many confuse inflation with the GDP deflator, although they are not exactly the same. The GDP deflator shows how prices for everything a country produces—goods and services—change over time. It helps determine whether the economy is genuinely growing or if prices are just increasing.

How does this work in practice? It's quite simple. Take the nominal GDP (the value at current prices) and divide it by the real GDP (the value at base year prices). The formula for the GDP deflator looks like this: nominal GDP divided by real GDP, then multiplied by 100. The result is a number that indicates the change in the price level.

To understand the result, you need to remember three things. If the deflator equals 100—prices haven't changed since the base year. Above 100—this indicates inflation, prices have increased. Below 100—deflation, prices have fallen. The easiest way is to subtract 100 from the result, and you'll immediately know the percentage change in prices.

Here's a specific example. Suppose in 2024, the nominal GDP of a country is $1.1 trillion. The real GDP (with 2023 as the base year) is $1 trillion. Applying the GDP deflator formula: 1.1 divided by 1, multiplied by 100—results in 110. This means prices have increased by 10% over the year. Simple and clear.

This indicator is important for understanding the actual economic dynamics. If you only look at nominal GDP, you might think the economy is growing, but in reality, everything has just become more expensive. The deflator helps separate the wheat from the chaff and see what is really happening.