>>61325368
Depends. If you're using it to measure the wealth of a country then it's absolutely just thirdie cope. If you're using it as a macroeconomic measurement for economic activity then it makes some sense because you don't actually care about wealth, you're just using total money flow as a proxy for economic activity. It even makes sense with no foreign currencies, like if you want to compare cheaper areas of the US with more expensive ones PPP adjustment makes sense if your goal is to measure economic activity rather than wealth.

Also some currencies are kept deliberately undervalued on currency markets (like the Yuan) so PPP adjustment gets you closer to the currency's "real value".