It depends on which polygamous model you favor. But matrilineal polygamy is somewhat liberated. Brave single moms live with their birth family and the maternal uncle is the male role model. Paternity cannot be established because of female promiscuity, so fathers have zero motivation to support mate and children that might not be his. Dads are not a thing. These are not prosperous societies. Male reproductive strategy is quantity over quality. Multiple baby mamas that he dont support. Girlfriend gotta live with her brother. Males who do not support their own children do not strive for economic productivity. Many societies in SS Africa, a few in SE Asia and the Americas.

In patriarchal polygamy the high status male will typically control multiple females and he will probably be expected to support them if he can be certain of paternity. Generation of wealth to support females can only happen when males can ensure paternity. Supporting someone elses babies is too evolutionarily costly. These Chads will jealously guard their females and lower status males (younger, poorer) will have fewer opportunities to mate. Similar to gorilla model where the males compete very violently for control of the harem. They don’t spend a lot of time caring for their children just competing with other males. Low trust, low prosperity.

If you look at what is happening in the US or other western countries, you will see that wealthier men like DT and Mel are polygamous patriarchs. They have a lot of wealth and a fair amount of control over their trophy wives. Most of them are supporting their exes.

Lower and middle class females have more matrilineal polygamy pattern. Maybe the baby daddy pays support or pays a visit now and again. Maybe not. Brave single moms employ hunter gatherer strategy by collecting food stamps, other gibs, doesn’t need a man but doesn’t live well.

Monogamy is a pact that men impose upon each other. Not women. The alpha male must be prevented from taking more than his share. High status is enjoyed by high value females far more than in the polygamous society.

Patriarchal polygamist females get more economic support from males than matrilineal polygamist females. But their power is lower. A demanding high value female can be replaced by two lower value females quite easily in patriarchal polygamy. So even very high value females have lowered bargaining power over the polygamist Chad. He can replace her.

Feminists haven’t figured this out yet.