The link between polygamy and dawn of agricultural

Polygamy and agriculture were intertwined because when agriculture arose there were certain people who could afford to feed more wives and hare more social power in general - this lead to a state where they could afford to be in "command" of multiple people through this - food at the time was essential namely!

Polygamy began to end when agricultural development and settling got introduced. During the nomadic non-agricultural period, polygamy was common and people were not tied to a single person.