This is from a summary of the Moral Animal by Robert Wright, excellent evolutionary psychology book, the summary is good enough excuse some of the informal language but it does a decent job.

CH 4 – THE MARRIAGE MARKET How to explain this? The world is run by men, but in most of the world polygamy is illegal. Sometimes this gets explained as a compromise between male and female natures. When you’re living on the edge, having two can mean neither survive. And why would a woman go for ½ a man when she could get her own?

The answer seems to be that economic equality tends to short circuit polygyny.
More than half of the known monogamous societies have been classified as “nonstratified” (equal)

What really demands attention then are the six dozen societies in the history of the world, including the modern industrial ones that are stratified and yet monogamous. One explanation is that polygyny lurks underneath. Dowry – a transfer of wealth from the bride’s to the grooms family- is found almost exclusively in stratified monogamous societies. Wealthy men in a monogamous society are a prize. The brides family must pay for that.

Winners and losers: Poor women, married to poor men would rather have polygyny. She could have ½ of a rich mans money. She goes up, all the men below the guy with two are going to have inferior women. And one dude is stiffed.

Married women living in poverty (or women without a husband or child, and desirous of both could be excused for wondering just which women’s rights are protected by monogamy. The only underprivileged citizens who should favor monogamy are men. It is what gives them access to women. Women gain more options with polygyny.

Upper classes hoarding women became politically untenable. Extreme polygyny often goes hand in had with extreme political hierarchy and reaches its zenith under despotic regimes. Zulu chiefs would have more than 100 women. Inca had more women the higher the rank.

What’s wrong with polygyny?: Low level men without wives compete fiercely. Violence, rape. An unmarried man between 24 and 35 is 3x as likely to murder another male as is a married man.

We wouldn’t want to live in a society where lots of low income men are mateless, but we do.

Not in 1960, but in 1990 the % of men not married ever over the age of 40 was way higher than for women. Probably many homeless and alcoholic men born in earlier times would have found a mate and been calmer.

Source

TLDR; With high status males taking all the women there no women left for low status men, with a net effect of most men without mates leading to increases in violence in society.

Rant@BluePill- I was looking at TBP and exTRP they talk a lot of shit about this sub. I thought this might show not every bit of evolutionary psychology and TRP logics support our so called misogyny. Because look he we are supporting a monogamous society. We do that all the time in threads about marriage and why we don't pursue it unfair/alimony/psychology of marriage. They just see it as, privileged selfish man trying to keep more from the victimized woman. Also how to game your wife. Really we are just pick up artists? Pick up artists usually go for women that aren't their wife