It might be both. See charts on the numbered page 4: https://sgp.fas.org/crs/misc/R45090.pdf https://sgp.fas.org/crs/misc/R45090.pdf Women at 10th, 50th, and 9

It might be both. See charts on the numbered page 4: https://sgp.fas.org/crs/misc/R45090.pdf https://sgp.fas.org/crs/misc/R45090.pdf Women at 10th, 50th, and 90th percentiles saw real wage increases from 1979-2019; men saw a decrease at 10th and 50th. (I'm morally opposed to the top 90th percentile's growth at the expense of the bottom. I'm not morally opposed to gender pay equality, which I _think_ is zero sum and results in lower wages for men as it improves.)