social mobility and parental love

The question is about social mobility - how far away from his/her parents' income percentile a child's income percentile is. Either up or down.

A completely socially mobile society, ie, one where there is no statistical link between parents' and children's incomes, would be depressing to parents. It would be like Sparta (or Israeli kibbutz) where the state threw all the children together in one big pool. It made parents feel worthless and lacking in control. These societies were not very successful at self-replicating. They required love to be spread too thin.