Low-Wage Workers Have far More Education than They Did in 1968, yet They Make far Less | Economic Policy Institute
"The minimum wage is 23 percent less than its peak inflation-adjusted value in 1968. This is despite productivity (how much output can be produced in an average hour of work in the economy) more than doubling in that time period. The low-wage workforce has surely contributed to this rise in economy-wide productivity, since as a group they have far more education now than they did then."