If those excluded are more skilled than their white male counterparts, better businesses offer then jobs and profit from it. There's a lag, yes, and sometimes it takes a long time to end that lag (which is why, for example, I and others aren't bothered in the least by provisions in, say, the '65 Civil Rights Act which ban private discrimination along racial lines), but ultimately the problem should be self-correcting, and we can expect it to correct much more rapidly nowadays, with better telecommunications and more competition from a global workforce, than it did in the more localized days of the early 1900s.