How is that calculated? 6 generations is 150 to 180 years. What do these numbers mean? What happens to a family after 3 generations? Is it then slightly up in the bottom 10%? Does it apply to all successors of the first generation? Who then is then after 6 generations the bottom 10%???
What about that one child in the poor family that makes “it” despite the dire outlook? Does it break that map??