I really liked this article. It was well written and enjoyable to read. Having said that, as Kemah’s comment above points out, the study is weak.

In the US, familial wealth is transitory. The pattern is that a family builds wealth over a couple of generations and loses it within a couple of generations. Poor people and rich people make terrible decisions, become morally bankrupt and possessed with foolish, self defeating beliefs.

The only constant is that moral and ethical behavior generates a sustainable path through multiple generations of family life. Social class has an impact but is by no means the only determining factor in how someone chooses to be.