FILE - In this April 14, 2016, file photo, union organizers, students, and supporters for a $15 an hour wage march through the Oakland section Pittsburgh. Modest income growth for most Americans, strikes by fast-food workers, and the rapid growth of low-paying jobs at the same time middle-income work shrinks have combined to make the minimum wage a top economic issue for the 2016 campaign. (AP Photo/Keith Srakocic, File)

WHY IT MATTERS: Minimum wage

Modest income growth for most Americans, strikes by fast-food workers, and the rapid growth of low-paying jobs at the same time middle-incom…