Beauty, Polygyny, and Fertility: Theory and Evidence

Abstract: We propose a simple model of a mating economy in both monogamous and polygynous cultures, and derive implications for how polygyny a¤ects individual and aggregate fertility. We \u85nd that an attractive woman is more likely to \u85nd a high-status husband. However, when polygyny is allowed, high-status husbands naturally attract other women; this implies that female beauty increases the likelihood of entering into a polygynous relationship. A woman in a polygynous relationship produces fewer children than a woman in a monogamous relationship as long as the preference for reproduction relative to consumption is not too strong. However, the societal practice of polygyny increases aggregate fertility through two distinct channels: (1) by increasing the number of marriages; and (2) by triggering fertility contagion: a woman, whether involved in a monogamous or polygynous relationship, produces more children as polygyny becomes more prevalent in her neighborhood. We empiricall