https://themeasureofaplan.com/wealth-map/ is a cool visualization/data tool about differences in (iirc) cost-of-living, mean income (well, gross national income % country population), and purchasing power. not sure if the income calculation is the best way to do so as it includes income that isn’t wage-related, so doesn’t paint the best picture of what the average joe is earning. like with all data, take it with a grain of salt and thoughtfulness.
it is put together by just a regular joe, so not sure how long data will be updated for or functionality will remain. found it when looking into where im at (london) and trying to understand how people can afford to live here. it seems so so expensive for the relative salary/income that i assumed was average. did some research and still confused. seems like the people out and about are likely wealthy already, tourists (thus less cost-considerate), or treating themselves. could be wrong.