The problem is the wealth is so highly concentrated with the racist light skinned spaniards. There is very little opportunity for anyone else.
Aside from Anna-Maria Armbuzzeri (I think I spelled that wrong), the heir to the Corona fortune (and married to U.S. Ambassador Tony Garza) who is BASQUE, not Spanish... and a Spanish emigre who started Wal Mart in Mexico, the wealtiest familes tend to be of partial Lebanese or European-Jewish descent... heavily mixed with your standard Mexican mutt family.
"Slim" and "Fox" don't sound like Spanish names to me. Neither does "Hayek."