In 1960, when Chicago's neighborhoods were filled with factory jobs, 22.3 percent of African-American men aged 20 to 24 neither held a job nor were in or finishing school. Figures among Latino and white men were somewhat higher, while most women of any race or ethic background were out of the workforce, most likley being housewives.

By 2015, the nonworking/not-in-school figure for that age range had dropped among all groups except white men, where it held about constant, and Latino men, where it rose about eight percentage points. But among black men, the idleness figure doubled, going from 22.3 percent to 45.8 percent before dipping a little in 2015 to 42.8 percent.

In other words, joblessness and poverty have become more concentrated.

That at least partially explains, the report suggests, why just five neighborhoods — Austin, Englewood, New City, West Englewood and Grand Crossing — accounted for a third of the homicides citywide in 2016. Jobless rates among teens in those neighborhoods ranged from 79 percent to 91 percent.

"Joblessness among young people is tied to the emptying out of jobs from neighborhoods," the report concludes. "In contrast, jobs (are) being centralized in Chicago's downtown areas where whites are employed in professional and related services."

In a a statement, schools network Executive Director Jack Wuest goes even farther: "The best jobs are moving north and east, while black and Latino youth are locked into" other neighborhoods "It's little wonder that so many of our youth sucumb to the gangs."

I'm not sure I buy that. Black men should be able to get jobs downtown just like whites and many Latino and black women.

Still, it's fair to conclude that black men in particular have had trouble adopting to the loss of factory jobs, report co-author Matt Wilson told me. But it's also fair to say that many African-Americans attend inferior schools, and some South Side areas do not have as good a connection to the Loop as the North Side.

Read the report and decide for yourself. But overall, I think it's fair to conclude that it provides some solid evidence that gang violence and murder need an economic remedy, not just a policing one.