Segregation by race has declined gradually since 1970, but separation by income has grown steadily in the same period.
The sheltering of upper income children in private schools not only accelerates the deterioration of public education, it hides its consequences from precisely those people who could do something about it.
One of the most interesting social trends of the past 20 years is the rise of residential segregation. So rich are living with rich and poor are living with poor.
You know, the biggest indicator of where you live is your income. If you live in this suburb you make this much money, and if you live in that suburb, you make that much money, and if you don't have any money you live where you're allowed to live.
There are caste systems in American cities: Many are marginalized to the edges of urban centers due to real estate costs; price tags seem to lurk around human encounters; there's a cult of overwork in the middle class; workers at your local manicurist, your local fast casual restaurant, are exploited.
You could use artificial intelligence to build a system around postcodes and income, which could lead to racial profiling.
Going in and out of a proverbial 'poor door' - a separate entrance for income-restricted residents of mixed-income housing - of your city every day has its costs, even if the 'poor door' woman would be considered affluent in another location.
As we segregate by income into different communities, schools in lower-income areas have fewer resources than ever.