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"Where single women are rare, women marry earlier, researchers reported Aug. 4 in the journal Evolutionary Psychology. The shift may be because the ladies have more men to choose from, while the men have extra motivation to put a ring on it.
"Women are basically getting snapped up, because the guys want to get her before somebody else does," study author Daniel Kruger, an evolutionary psychologist at the University of Michigan, told LiveScience.
Attack of the single woman
Kruger first became interested in studying the effects of gender imbalance on the marriage market when he caught a glimpse of a magazine cover on a trip to New York City.
"It had this cover picture on it that said, 'Attack of the Single Woman,' and it had this giant woman with a big red dress like Godzilla tromping through the city," Kruger recalled. "It made me wonder just what would happen to these relationship dynamics if there really was a surplus of single women."
To find out, Kruger analyzed census data on marriage age and gender imbalances in the 50 largest metropolitan areas in America. Using the data, he calculated what's called an operational sex ratio, which is the number of sexually available men per 100 sexually available women, multiplied by 100. A ratio of 100 means a balanced population, while numbers larger than 100 indicate a surplus of men. A ratio of 110, for example, means 11 men are available for every 10 women. A ratio of 90 would mean nine men are available for every 10 women.
After controlling for income and race, Kruger found that in areas where women were scarce, women married slightly earlier. Men's average age of marriage didn't change relative to the abundance of potential mates, but they did show more variability in the age when they married than women did. That's likely because guys who can snag a women will settle down quickly, Kruger said, but because women can be more choosey, other men may have to build up their finances and social status before they can catch a bride.
"[Some guys will] settle down and take the women before other guys can," Kruger said. "But other guys will have to work more and thus they'll get married at later ages."
Wedding bells ring sooner for women in places where single ladies are scarce, according to a new study of metropolitan areas in America
Wedding bells ring sooner for women in places where single ladies are scarce, according to a new study of metropolitan areas in America
Top imbalanced cities (USA)
The top five areas where women were scarce, with their gender ratio and median age of marriage for women, were:
Las Vegas: ratio 116, 24.5 years (Median marriage age for women)
San Diego: ratio 115, 25.9 years
Salt Lake City: ratio 113, 23.2 years
Austin, Texas: ratio 112, 26.2 years
Phoenix: ratio 111, 25 years
The top five areas where men were scarce were:
Birmingham, Ala.: ratio 88, 26.7 years (Median marriage age for women)
Memphis, Tenn.: ratio 88, 27.2 years
New Orleans: ratio 89, 27.8 years
Richmond, Va.: ratio 89, 26.3 years
A three-way tie for New York City, Philadelphia and Washington, D.C., ratio 92, where median marriage ages were 28.3, 27.9 and 27.8, respectively.
