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Men crowded into and on a train in India

Nothing like this has happened in human history. A combination of cultural preferences, government decree and modern medical technology in the world’s two largest countries has created a gender imbalance on a continental scale. Men outnumber women by 70 million in China and India.

The consequences of having too many men, now coming of age, are far-reaching: Beyond an epidemic of loneliness, the imbalance distorts labor markets, drives up savings rates in China and drives down consumption, artificially inflates certain property values, and parallels increases in violent crime, trafficking or prostitution in a growing number of locations.

Those consequences are not confined to China and India, but reach deep into their Asian neighbors and distort the economies of Europe and the Americas, as well. Barely recognized, the ramifications of too many men are only starting to come into sight.

“In the future, there will be millions of men who can’t marry, and that could pose a very big risk to society,” warns Li Shuzhuo, a leading demographer at Xi’an Jiaotong University.

Out of China’s population of 1.4 billion, there are...