"One billion of the world’s population are rich; four billion are, albeit at varying pace, on the way to becoming rich; the real challenge is the “bottom billion.” They are caught in a number of “traps” that keep them poor and almost guarantee that they will be poorer in the years ahead, a ghetto of misery, disease, and discontent on an otherwise flourishing planet. The bottom billion are the radically marginalized. Seventy percent of them are in Africa. Although Collier does not discuss Catholic social doctrine, his analysis is remarkably similar to that of John Paul II’s 1991 encyclical Centesimus Annus: The really poor are poor because they are excluded, or exclude themselves, from the global circle of productivity and exchange."
Check it out.