https://en.wikipedia.org/wiki/Purchasing_power_parity

https://www.thebalance.com/purchasing-power-parity-3305953

https://data.oecd.org/conversion/purchasing-power-parities-ppp.htm

https://www.oecd.org/sdd/prices-ppp/purchasingpowerparities-frequentlyaskedquestionsfaqs.htm

https://www.youtube.com/watch?v=Wd0OPoSgCmc