Well, I certainly agree with your point that economic opportunity alone is insufficient for wealth creation. If element you're pointing out is missing from low-

Well, I certainly agree with your point that economic opportunity alone is insufficient for wealth creation. If element you're pointing out is missing from low-SES communities is that unquantifiable culture, and I agree. Since this puts us way off the track of political correctness, I'll bring up what I consider the shining example of social mobility in the US: American Jews. I would argue that the Jewish community maximizes both economic opportunity and a variety of social pressures - on education, family, and community.