PPP is and always will be a garbage metric. Don't compare my Pepperidge Farm 15-Grain bread, sold for $3 a loaf at the supermarket with steamed buns sold for ¥1 each on the street.
I want a "good cheese, good wine, good bread" price comparison metric. By that measure, my money in the US only goes like 1/2-1/3 as far as the same amount in France, since it takes about 2-3x the money to consistently match the quality of their bog-standard stuff in those categories. Usually a good bit of travel time, too, in the case of bread. :-( [EDIT] actually 3x might be low on the bread. 3.5-4x, probably, arou…
I have never found a decent baguette outside of France at any price, so you're doing better than me.
How would your price metric work then?