Jolliffe, DeanMahler, Daniel GerszonLakner, ChristophAtamanov, AzizKofi Tetteh-Baah, Samuel2025-08-052025-08-052025-08-05The World Bank Economic Review0258-6770 (print)1564-698X (online)https://hdl.handle.net/10986/43542Purchasing power parities (PPPs) are used to estimate the international poverty line (IPL) in a common currency and account for relative price differences across countries when measuring global poverty. This paper assesses the impact of the 2017 PPPs on the nominal value of the IPL and global poverty. Updating the 1.90 dollars IPL in 2011 PPP dollars to 2017 PPP dollars results in an IPL of 2.15 dollars, a finding that is robust to various methods. Based on an updated IPL of 2.15 dollars, the global extreme poverty rate in 2017 falls from the previously estimated 9.3 to 9.1 percent, reducing the count of people who are poor by 15 million. This is a modest change compared with previous updates of PPP data. The paper also assesses the methodological stability between the 2011 and 2017 PPPs, scrutinizes large changes at the country level, and updates alternative, complementary poverty lines with the 2017 PPPs.en-USCC BY 3.0 IGO2017 PPPSGLOBAL POVERTYTHE INTERNATIONAL POVERTY LINESOCIETAL POVERTYSUSTAINABLE DEVELOPMENT GOALSJournal ArticleWorld Bank