I have no strong desire to argue with you on this point, since it’s irrelevant to my point what the fundamental cause is of the shrinking wage gap and expanded female workforce, just that those that those two things are true.
But I can explain how the women’s rights movement can directly cause the existence of more single-parent families and the need for two wage earners. And if we remove it and are forced to explain those two things, then I don’t know what to offer as an alternative.
If women feel like they should have a career and can have a career, then they will seek more education and consider their job to be an actual part of their life - not just a hobby that gives them enough money to go shopping every once in a while, while waiting for a husband to come along. There’s no rush to get married because they are self-sufficient and there’s no rush to make babies because, again, they are self-sufficient. Getting a man and locking him into the situation is a lower priority. You can take your time and be choosy and intelligent about when and what makes sense.
And now that we have women working up the ladder and earning money at an uneven distribution to one another - rather than nearly all of them just earning a similar wage for doing basic, menial labor - the high-paid ones can team up with high-paid men, creating a high-powered household. Before your average set of households would look like:
M + F (salary per year)
$2 + $1
$2 + $1
$2 + $1
$4 + $1
$4 + $2
$8 + $1
$8 + $2
$16 + $1
Now it looks like:
$2 + $1
$2 + $2
$2 + $1
$4 + $4
$4 + $3
$8 + $6
$8 + $7
$16 + $10
If you’re an old fashioned guy, making middle-good money, who wants a wife that never advanced higher than earning minimum, you’re competing with guys who are fine with a wife who is also earning middle-good money. The market has adjusted to the new economy. Houses don’t continue costing the same, independently of how much money people make, the most expensive houses become that much more expensive. If Bill Gates could buy the best home in the country for 10 years of his wages, in 1950, for $170. In 2020, he’ll have to pay $260. The market adjusts to meet the buying power of the populace and try to screw over the wealthy.
While it may well be that income inequality has grown since 1950, you can be relatively certain that price inequality has also grown. The cheapest bottle of wine versus the most expensive is almost certainly a significantly greater multiplier than it was in 1950. Price inequality doesn’t completely cover for the issue of income inequality for various reasons that I won’t go into, but once you have a case where some or most households are embracing the existence of high-income women, if you’re not on that boat as well, then you’re going to have a significantly reduced purchasing power compared to others. You need two wage earners, to keep up with the Joneses.
I wouldn’t say that it’s an absolute absolute that income inequality is due entirely, mostly, or at all due to assortative marriage - it hasn’t had the same impact on countries like Norway and such (but that’s likely due to them adjusting and taxing at a high enough rate to render an effect like this moot) - but you would need to offer some alternative that explains everything we see. As it is, you’re pointing at half of the things that we would expect to happen, if women’s rights was effective, and saying that they’re the cause of the other half. But that leaves half of everything unexplained. So between an argument that can explain everything, and which does bear the scrutiny of some damn-good economists, or an explanation that only covers half of everything and comes from a dog typing at the keyboard on a computer connected to the internet (everyone on the internet is actually a typing dog - that’s a common joke, not an insult), I’d go with the idea that seems to explain everything and also obeys economics as we know it.