From In an Unequal America, Getting to Work Can Be Hell:

“A lot of these workers in low-wage jobs—they either have to [move] to Prince George’s County, Maryland, or Alexandria, Virginia, and the transportation network has not changed to meet the changing demands,” says Yesim Sayin Taylor, an economist and founding executive director of the DC Policy Center, a think tank focusing on Washington’s economic and social issues. “Even though transportation is costly, it’s less costly than living in the city.”