Analysis of information sources in references of the Wikipedia article "List of regions by past GDP (PPP) per capita" in English language version.
The Maddison Project has thus made the unusual decision to produce two GDP series. One series (rgdpnapc) is purely within-country, with the international price comparisons being done only once (2011). The other (cgdppc) coerces the GDP data to fit every international price comparison the Maddison Project has on record, no matter how ridiculous
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