Tibetan data clearly indicate that monogamy is preferred if economic base is rich

Tibetan data clearly indicate that monogamy is preferred if economic base is rich

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Tibetan data clearly indicate that monogamy is preferred if economic base is rich, but not if it requires dividing already small estates among more than one heir Other societies have dealt with this by making one child (usually first-born son) the only heir -- a system termed "unigeniture"; but in the Tibetan case there seems to be enough payoff from cooperative labor that polyandry is economically & reproductively best option In fact, limited data indicate that polyandrous marriage increases RS of the wife, and (given close relatedness to co-husbands) senior males don't sacrifice much in reproductive benefits, while junior males do better than if they were disinherited Nevertheless, Tibetan households rarely include more than active 2-3 co-husbands; families with lots of sons send some of them to the local monastery to become Buddhist monks, or else the family estate is partitioned (sometimes in bitter disputes) after 4th or
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