because the well educated, high income parents (now with more uniformly high income extended families) tend to give a higher level of attention, resources, and support to their children compared to the children of the poor, working, and middle classes.
That's the uncontroversial perspective, yes. The more controversial, but far better-supported-by-evidence perspective is that the estimated 40-80% contribution that genes make to people's intelligence, conscientiousness, and work ethic is much more likely to be at play, here.
That's the uncontroversial perspective, yes. The more controversial, but far better-supported-by-evidence perspective is that the estimated 40-80% contribution that genes make to people's intelligence, conscientiousness, and work ethic is much more likely to be at play, here.