[chmod600]

The Forbes article study is a bit too creative to apply to this discussion:

"Rather than using the more traditional metric of income, this study uses educational attainment as the basis for defining upward mobility."

The Atlantic article seems like more of the same: comparing brackets and ignoring mobility.

[thinkcontext]

Then you must be distressed that mobility has been decreasing in the US and that we now lag substantially behind many of our European peers on that measure.