W.E.B. DuBois's study, 'The Philadelphia Negro,' concluded that the economic challenges faced by Black communities were primarily due to the lack of individual effort rather than systemic social issues.

W. E. B. DuBois's study, 'The Philadelphia Negro,' investigated the lives of Black people in Philadelphia during the late 19th century. He found that many of the economic struggles they faced were not just about individual effort, but were deeply connected to larger social issues like racism, discrimination, and lack of access to education and jobs.