The world of my WIP is a female-dominated society only 20% of the population is male. Id like to hear some opinions regarding the likelihood of polygamy in such a world. Also, what are the benefits and detriments of this sort of arrangement?

The articles Ive read indicate that the male would have less parental investment and the females would compete with each other for male attention.

My personal bias is toward monogamy, but in a dystopian world with a shrinking population, the need for genetic diversity polygamy could take precedence.

What are your thoughts?