How can GNI be compared among countries?

Gross National Income (GNI) can be compared among countries by adjusting for purchasing power parity (PPP), which accounts for the relative cost of living and inflation rates. This allows for a more accurate comparison of economic productivity and standards of living. Additionally, expressing GNI in per capita terms provides insight into the average income of individuals within each country, facilitating comparisons across different population sizes. Statistical data from organizations like the World Bank or the International Monetary Fund can provide standardized GNI figures for analysis.