Who's Counting?

A recent Wall Street Journal article reports on male selection. Since the late 1970’s, 163 million female babies have been aborted by parents seeking sons.

Mara Hvistendahl is worried about girls. In "Unnatural Selection," Ms. Hvistendahl reports on this gender imbalance: what it is, how it came to be and what it means for the future.

In nature, 105 boys are born for every 100 girls. This ratio is biologically ironclad. Between 104 and 106 is the normal range, and that's as far as the natural window goes. Any other number is the result of unnatural events.

Yet today in India there are 112 boys born for every 100 girls. In China, the number is 121—though plenty of Chinese towns are over the 150 mark. China's and India's populations are mammoth enough that their outlying sex ratios have skewed the global average to a biologically impossible 107. But the imbalance is not only in Asia. Azerbaijan stands at 115, Georgia at 118 and Armenia at 120.

What is causing the skewed ratio: abortion. If the male number in the sex ratio is above 106, it means that couples are having abortions when they find out the mother is carrying a girl.

High sex ratios mean that a society is going to have "surplus men"—that is, men with no hope of marrying because there are not enough women. Such men accumulate in the lower classes, where risks of violence are already elevated. And unmarried men with limited incomes tend to make trouble. In Chinese provinces where the sex ratio has spiked, a crime wave has followed. Today in India, the best predictor of violence and crime for any given area is not income but sex ratio.

A high level of male births has other, far-reaching, effects. It becomes harder to secure a bride, and men can find themselves buying or bidding for them.

Sex determination has been against the law in both China and India for years, to no effect.