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Nobody's to say. For some reason some people think that statistics dictate reality when obviously they just take an average. The zip code thingy is silly, but on average more expensive zip codes produce children with higher incomes.
Yeah because their parents are better educated and pass on their values to their kids. So what? I am frankly tired of this modern idea that is is somehow unfair if parents pass on their advantages to their kids. That is what nature has always been about. It even starts before people have kids - they seek out partners that maximize the potential for their kids. So if a woman chooses an intelligent (or even just rich)…
I love music from Drake, Michael Jackson, Whitney Houston, Justin Bieber and the like. Their music and the fact we live in a society where stars are bred for music -- that's incredible. Fair/unfair isn't a very interesting binary. Natural variance and inequity is an important part of healthy competition. How much inequity is too much? That's a very interesting question.