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Supplementary material from "Greater wealth inequality, less polygyny: rethinking the polygyny threshold model"

Version 2 2018-07-18, 08:35
Version 1 2018-07-04, 08:38
Posted on 2018-07-04 - 08:38
Monogamy appears to have become the predominant human mating system with the emergence of highly unequal agricultural populations that replaced relatively egalitarian horticultural populations, challenging the conventional idea—based on the polygyny threshold model—that polygyny should be positively associated with wealth inequality. To address this polygyny paradox, we generalize the standard polygyny threshold model to a mutual mate choice model predicting the fraction of women married polygynously. We then demonstrate two conditions that are jointly sufficient to make monogamy the predominant marriage form, even in highly unequal societies. We assess if these conditions are satisfied using individual-level data from 29 human populations. Our analysis shows that with the shift to stratified agricultural economies: (i) the population-frequency of relatively poor individuals increased, increasing wealth inequality, but decreasing the frequency of individuals with sufficient wealth to secure polygynous marriage, and (ii) diminishing marginal fitness returns to additional wives prevent extremely wealthy men from obtaining as many wives as their relative wealth would otherwise predict. These conditions jointly lead to a high population-level frequency of monogamy.

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Journal of the Royal Society Interface

AUTHORS (34)

Cody T. Ross
Monique Borgerhoff Mulder
Seung-Yun Oh
Samuel Bowles
Bret Beheim
John Bunce
Mark Caudell
Gregory Clark
Heidi Colleran
Carmen Cortez
Patricia Draper
Russell D. Greaves
Michael Gurven
Thomas Headland
Janet Headland
Kim Hill
Barry Hewlett
Hillard S. Kaplan
Jeremy Koster
Karen Kramer
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