The article makes some interesting points but there seems to be a flawed use of statistics. Particularly the part about "the percentage likelihood that a bottom 10 percenter will ever make it to the top 10 percent. For 99 out of 100 people, rags never lead to riches." Well, what would you expect? There's going to be a pure mathematical limit to that sort of movement, nevermind issues of income mobility. To take an ab…
Additionally, he is making the implicit assumption that low parental income causes low adult income, and therefore hard work doesn't matter. But that's nonsense. It's also equally possible that some heritable (not necessarily genetic) trait causes both low parental and low child income. One plausible alternative explanation: lazy parents tend to have lazy children and lazy people tend to be poor. This causes a correl…
Hard work matters -- but your baseline is probably more important.