From The Atlantic's online Cities section:

Class-Divided Cities: Detroit Edition


This is the 12th and final post in a series exploring the class divides across America's largest cities and metros. Using detailed data from the American Community Survey, it examines the residential locations of today's three major classes: the shrinking middle of blue-collar workers; the rising ranks of the knowledge, professional, and creative class; and the even larger and faster-growing ranks of lower-paid service workers.
N.B., this is a Richard Florida article.