If you look at the trendlines for what certain types of jobs or fields paid (e.g., doctor, nurse, programmer, marketer), you'd see that when women enter a particular field en masse, the pay drops. And when the gender balance in that field goes from majority female to majority male, the pay increases.

Some well-intentioned parent is probably telling their daughter right now, "Look at field X, which is male-dominated and pays really well! You should study that." And by the time they've grown up to be of working age, the field is at 60F/40M, and the pay has gone way down.