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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T. Ross, Cody; Borgerhoff Mulder, Monique; Oh, Seung-Yun; Bowles, Samuel; Beheim, Bret; Bunce, John; et al. (2018). Supplementary material from "Greater wealth inequality, less polygyny: rethinking the polygyny threshold model". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.4153658.v1
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AUTHORS (34)
CT
Cody T. Ross
MB
Monique Borgerhoff Mulder
SO
Seung-Yun Oh
SB
Samuel Bowles
BB
Bret Beheim
JB
John Bunce
MC
Mark Caudell
GC
Gregory Clark
HC
Heidi Colleran
CC
Carmen Cortez
PD
Patricia Draper
RG
Russell D. Greaves
MG
Michael Gurven
TH
Thomas Headland
JH
Janet Headland
KH
Kim Hill
BH
Barry Hewlett
HS
Hillard S. Kaplan
JK
Jeremy Koster
KK
Karen Kramer