> "It would help explain why a lot of "poorer" countries reportedly don't feel poorer to live in, for a normal family, than the US."

There are many sources for purchasing power parity (PPP) corrected GDP if you're looking for a source on this. PPP-correction does indeed reduce the disparities, but does not eliminate them. It's also tough to judge relative living standards as a tourist or during a short-term stay in a poorer country, as one is generally exposed to 'nice' subset of locales and people.