Under sex-dependent continuation probabilities, the evolutionary stable strategy is a 1:1 sex ratio among last-born children, not necessarily at birth, offering a possible explanation for the male-biased human birth ratio.
Chahnazarian, Population and Development Review 17, 1 (1991)
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Balancing the Last Birth: A Game-Theoretical Resolution to the Human Sex Ratio Puzzle
Under sex-dependent continuation probabilities, the evolutionary stable strategy is a 1:1 sex ratio among last-born children, not necessarily at birth, offering a possible explanation for the male-biased human birth ratio.