True for many places but not for all. I'm sure there are places in the world where cost of living is not that much cheaper, while income levels are significantl

True for many places but not for all. I'm sure there are places in the world where cost of living is not that much cheaper, while income levels are significantly worse than in the US. I'm thinking of Moscow in particular (where rent prices are also quite high). 2017 median income was, reportedly, about 63k RUB/month (~$1k/mo) after the taxes: https://www.numbeo.com/cost-of-living/compare_cities.jsp?country1=Russia&country2=United+States&city1=Moscow&city2=New+York%2C+NY https://www.numbeo.com/cost-of-living/compare_cities.jsp?cou... That makes (very roughly) 2.5x cheaper cost of living difference to the US, while income difference is, very roughly, about 4x less ($12k vs $50k after taxes)