"edges"

While reading Ghostwritten and Darkmans, I have noticed the idea of liminality arising over and over again. Particularly, I have noticed the recurrence of edges, like quasars on the edges of black holes. "Gaffar's father had been born in Sinjar, on the Syrian/Iraqi border (it was the Kurdish lot to be born on the edge of things, the perimeter, to be squeezed into the outer reaches; at worst to be persecuted, at best loathed and ignored)" (Barker 66). I am beginning to see edges as a part of globalization. Biopower, for example, by categorizing everything, must have many "edges." I am curious as to why these edges would be come so prevalent in globalization. I realize that there was an "acceptable" and a "other," before biopower, large groups with which persons could identify. Now that nothing is "other," and everything is classified, is labeled, does this greatly increase marginalization?