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Purchasing power parity
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==PPP vs. CPI== [[Consumer price index]] (CPI) and purchasing power parity (PPP) conversion factors share conceptual similarities.<ref>{{cite journal |last1=D. |first1=Rao |title=Integration of CPI and PPP: Methodological Issues, Feasibility and Recommendations |journal=Recent Advances in Methods and Applications |date=2001 |id=Agenda item nΒ° 4 |series=Joint World Bank β OECD Seminar on Purchasing Power Parities |url=https://www.oecd.org/sdd/prices-ppp/2424597.pdf |url-status=dead |archive-url=https://web.archive.org/web/20220812213450/https://www.oecd.org/sdd/prices-ppp/2424597.pdf |archive-date= Aug 12, 2022 }}</ref> The CPI measures differences in levels of prices of goods and services over '''time''' within a country, whereas PPPs measure the change in levels of prices across regions within a country.
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