On the face of it, all thing being equal, your graph supports your point. However, all things are not equal. Your graph shows no growth in family income betwee

On the face of it, all thing being equal, your graph supports your point. However, all things are not equal. Your graph shows no growth in family income between 1970 and 2007. But in 1970, Dad worked a shift and maybe Mom, while in 2007, to make the same money, Dad works two jobs and so does Mom. That was rather the whole point of the original article, but you seem to have missed it. People may have the same amount of money, but a) they work every waking hour of the day and b) they have other costs that offset the income, such as health care. But they could have state-paid butlers washing their clothes and cooking their meals and it wouldn't offset the lower quality of life that comes from working multiple jobs, never seeing their kids, and being homeless the moment they get sick.