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Study suggests higher levels of congestion are initially associated with faster economic growth. But, above a certain threshold, congestion starts to become a drag on growth.

A new study observes the growing economic and income divide's impact on America's neighborhoods. Researchers have found the proportion of Americans living in 'middle class' neighborhoods declining, while 'rich' and 'poor' neighborhoods are growing.

This will have huge economic and societal impact.  Are we considering this new future as people live longer?