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Excellent “story map” from ESRI that visualizes both the economic disparity between neighborhoods and the disappearing middle class in several US cities:

And for the first time in recorded history, the middle class no longer constitutes the nation’s economic majority, as upper- and lower-class households together comprise over 50 percent of the population.

But income disparity is visible on the map as well as in the stats. “The wrong side of the tracks” has long been a cultural truism; although the railroad reference may no longer apply, neighborhoods in close proximity to one another often reflect dramatic differences in economic status. And many of the boundaries between wealthy and low-income areas are shifting as cities gentrify and immigrant populations fluctuate.