下麵OECD PPP是Purchasing power parities (PPP)；是經濟上影響生活水平的

https://www.oecd.org/en/data/indicators/purchasing-power-parities-ppp.html

Purchasing power parities (PPPs) are the rates of currency conversion that try to equalise the purchasing power of different currencies, by eliminating the differences in price levels between countries. The basket of goods and services priced is a sample of all those that are part of final expenditures: final consumption of households and government, fixed capital formation, and net exports. This indicator is measured in terms of national currency per US dollar.