Earlier quoted context omitted.
Economics is generally not a zero sum game. At least according to what they taught me in Econ 101, on a macroeconomic scale skilled workers tend to increase job availability. They spend a larger portion of their income on services, which has a positive multiplier effect.
> skilled workers tend to increase job availability Who'd imagine squeezing the middle class would backfire epically? Compensation hasn't reflected the GDP per capital increases for the majority of the workforce. I don't think even the productivity increases from personal computers in the end of the 1970's have trickled down.
Why would investments by employers result in higher compensation for employees?
That said, median real individual income has increased substantially since the 1970s: https://fred.stlouisfed.org/series/mepainusa672n