Well first, we're talking about the zip code one is raised in not the zip code one ends up in later in life. Second, we're discussing the efficacy of IQ as an actual measure of intelligence. You're assuming IQ is a good measure of intelligence in order to prove IQ is a good measure of intelligence. Sure, zip codes are a proxy for IQ if we accept that IQs test something other than just intelligence.
Finally, the causal relationship you have set up between intelligence and quality of living situation, while undoubtedly true to _some_ extent, ignores everything we know about system racism, system sexism, our horrific healthcare system and a host of other factors that complicate this idea - at least in the US.
Finally, the causal relationship you have set up between intelligence and quality of living situation, while undoubtedly true to _some_ extent, ignores everything we know about system racism, system sexism, our horrific healthcare system and a host of other factors that complicate this idea - at least in the US.