主题：【原创】闲谈GDP-前言. -- 老广

Purchasing power parities

Purchasing power parity (PPP) conversion factors take into account differences in the relative prices of goods and services—particularly non-tradables—and therefore provide a better overall measure of the real value of output produced by an economy compared to other economies. PPP GNI is measured in current international dollars which, in principal, have the same purchasing power as a dollar spent on GNI in the U.S. economy. Because PPPs provide a better measure of the standard of living of residents of an economy, they are the basis for the World Bank’s calculations of poverty rates at $1 and $2 a day. The GNI of developing countries measured in PPP terms generally exceeds their GNI measured using the Atlas method or using market exchange rates.