[psalaun]

No more no less than GDP. They outline different realities, which are all interesting to analyse as a whole.

[wqaatwt]

PPP on its own is a relatively poor metric and only covers a subset of the economy.

Then when you have semi closed economy like Russia with unclear currency rates (due to external capital inflow/outflow barriers) and convert the figures to USD you can end up with all sorts of wacky numbers