If they paid 100% to the blonds, then they eliminate any benefit to them from hiring blondes in particular,
Not necessarily (assuming by “they” you mean an individual employer rather than the market as a whole) -- in that scenario, the most qualified blond willing to work for 100 will be more qualified that the most qualified brunette willing to work for 100.
Not necessarily (assuming by “they” you mean an individual employer rather than the market as a whole) -- in that scenario, the most qualified blond willing to work for 100 will be more qualified that the most qualified brunette willing to work for 100.