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Given that I am interested in comparing various countries by their GDP per capita - which way of calculating this metric should I use? Namely, when to use current US\$, when to use constant 2015 (or other year) US\$, and when PPP (current or constant international \$ one)?

What are pros and cons of each approach and which one is most popular?

I have seen this question: World bank data - GDP per capita current US\$ vs constant 2005 US\$ and I understand how these different ways of calculating statistic work. But I still find it not entirely clear when to use one over the other?

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