The GDP deflator is an important measure used to estimate the level of prices in a country's economy. It differs from other measures of inflation, like the Consumer Price Index (CPI), by considering all goods and services produced domestically, rather than just consumer goods. The GDP deflator is calculated as the ratio of nominal GDP to real GDP, multiplied by 100:
\[\text{GDP Deflator} = \left(\frac{\text{Nominal GDP}}{\text{Real GDP}}\right) \times 100\]
- Nominal GDP is the market value of goods and services produced in a year at current prices.
- Real GDP is the value of economic output adjusted for price changes (inflation or deflation).
A GDP deflator greater than 100 indicates that the overall price level (inflation) has increased compared to the base year, while a deflator less than 100 shows a decrease.
By examining the GDP deflator alongside the money supply growth and velocity of money, economists can analyze discrepancies, like the ones seen between the inflation rate and money supply growth from 2010 to 2016. Understanding this deflator helps pinpoint whether economic growth is driven by real productivity gains or simply by inflationary pressures.