The cost of maintenance and a nearly balanced sex ratio in a geographical area tends to limit this type of marriage.

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Quizplus · Accepted Answer

The cost of maintaining multiple spouses is often high, and a nearly balanced sex ratio limits the ability for some individuals to have multiple spouses, which limits the practice of polygamy. Endogamy is the practice of marrying within one's own social group, which is not limited by maintenance costs or sex ratios. Homogamy is the practice of marrying individuals who are similar to oneself, which is also not limited by maintenance costs or sex ratios. Monogamy is the practice of marrying only one person, which is not affected by maintenance costs but may be affected by sex ratios in terms of the availability of potential partners.

The Cost of Maintenance and a Nearly Balanced Sex Ratio