Are _you_ one of those workers who _has_ to eat, sleep and wear clothes? Do you also have kids? And a need for housing? And a spouse? And the probability that any one of you could get sick at any moment, or the fact that government takes 25% of your $30,000 every year? What if you or your spouse gets laid off because your jobs are being sent to Mexico?

(I'm not making this last point up by the way. I was warned that if we didn't become more efficient our jobs would be sent to Mexico.)

I'm not trying to be irrational here. I'm just saying that you're thinking at the margin about people's lives, and over time margins get eroded, then eroded some more, then a little more... hence the numbers this person is highlighting.

And, over the course of nearly a century, we see it has dramatic effects.

EDIT: I might also make the point that women entering the workforce definitely, by the looks of these numbers, didn't drive a vast expansion in the number of jobs. Rather, it displaced many men who _used_ to have those jobs, and proved its inflexibility at the same time.