This article, written by Max Miller, is an interesting way of thinking about the implications of making polygamy legal. Marina Adshade, an economists known for her book “Dollars & Sex”, states that polygamy is good for women. She claims that polygamy is beneficial for women using a Pareto efficiency approach.
She uses a merely economic intuition, meaning that the decision any woman makes of who is she going to marry only depends on her income implication. In her example, she considers that every woman is free to decide who is she marrying with.
On the other hand, the article includes an apology in favor of keeping polygamy illegal. This rejection is made by Joseph Henrich, an antropoligist who thinks that, in this world, rich men are going to be more benefited, and poor men are going to be left without a partner.
Even if women choose who they want to marry only based in her income implications (which Marina Adshade defends in her book), I’m more inclined to think that a world in which polygamy is legal is worse, economically speaking.
I believe that the social costs in terms of violence and inequality in a world in which poor people can´t marry (because nobody wants to marry them) would be greater than the one we have now. Nevertheless, I do think that Marina Adshade’s point of view is quite interesting.
Here’s the article: http://bigthink.com/dangerous-ideas/22-polygamy-is-feminist