Economy · Glossary
GDP, PPP (constant 2021 international $)
NY.GDP.MKTP.PP.KD
Definition
This indicator provides values for gross domestic product (GDP) expressed in constant international dollars, converted by purchasing power parities (PPPs). PPPs account for the different price levels across countries and thus PPP-based comparisons of economic output are more appropriate for comparing the output of economies and the average material well-being of their inhabitants than exchange-rate based comparisons. Gross domestic product is the total income earned through the production of goods and services in an economic territory during an accounting period. It can be measured in three different ways: using either the expenditure approach, the income approach, or the production approach. This indicator is expressed in constant prices, meaning the series has been adjusted to account for price changes over time. The reference year for this adjustment is 2021. The PPP conversion factor is a currency conversion factor and a spatial price deflator. PPPs convert different currencies to a common currency and, in the process of conversion, equalize their purchasing power by eliminating the differences in price levels between countries, thereby allowing volume or output comparisons of GDP and its expenditure components.
Methodology for Economy indicators
Economic indicators measure the size, structure, and dynamics of a country's economy. The World Bank collects data from national statistical offices, central banks, and the IMF, then normalizes it for cross-country comparison. Watch out for nominal versus real (inflation-adjusted) values: nominal figures in current US dollars are sensitive to exchange rate swings, while constant dollar series isolate real growth. Most macro indicators have a 1–2 year reporting lag.
How to interpret
- Always check the unit and reporting year before comparing values across countries.
- NULL or "Not available" means the World Bank did not publish a value — we never estimate.
- Year-over-year changes can be driven by methodology updates, not just real economic shifts.