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My latest Mind and Matter column in the Wall Street
Even a rational optimist is pessimistic about some things. Here's
one: the gradual distortion of the human sex ratio by sex-selective
abortion. A new essay by the demographer Nicholas Eberstadt
concludes that "the practice has become so ruthlessly routine in
many contemporary societies that it has impacted their very
population structures." He finds "ample room for cautious
pessimism" in the fact that this phenomenon is still very much on
For obscure reasons, the human sex ratio is always slightly
male-biased, but in the natural state it rarely goes above 105 male
births per 100 female ones, except in small samples. In China's
last mini-census in 2005, the ratio was nearly 120 to 100 and in
some districts over 150. That this is caused by sex-selective
abortion (and not, for example, by a hepatitis-B epidemic, which
can favor male births) is proved by a ratio of 107 to 100 among
first-born children but nearer 150 among ones born later.
China is not the only country where this is happening. By the
early 21st century, all four Asian "tigers"-South Korea, Singapore,
Hong Kong and Taiwan-had a "naturally impossible" ratio of 108 or
higher. India has an increasing ratio, as high as 120 in some
states. Even some European and central Asian countries (including
Albania, Georgia and even Italy) have unnaturally male-biased
births. Nearly half the world falls in this category.
For 2005 to 2010, the United Nations puts the world sex ratio at
birth at 107 boys to 100 girls. Assuming 105 is natural, Dr.
Eberstadt calculates that this translates into a global "girl
deficit" of at least 32 million. The consequences, in terms of
unmarried and perhaps disruptive men, may be serious and
The phenomenon apparently gets worse with prosperity. Countries
like Vietnam have shown male-biased birth ratios only since
starting to grow rapidly richer. An analysis by Christophe Guilmoto
and Sébastien Oliveau has shown that, in China and India, the
problem is more acute in fairly rich regions.
Why? As people get richer, they plan smaller families, and those
who have had a girl first are prepared to go to great lengths to
ensure having a boy the next time. Economic growth also means more
access to ultrasound scanning and abortion. Female infanticide
after birth still happens, but it is both psychologically harder
than abortion and less easy to disguise as a medical necessity.
Of course, near-perfect sex selection can be achieved with
in-vitro fertilization (by implanting only male embryos), but this
will remain a luxury of the very rich. What about sperm selection?
A clinical trial getting under way in the U.S. will test a method
for sorting human sperm into X (female determining) and Y (male)
types; it's already used in animals such as dairy cattle with 93%
accuracy. If this method becomes cheap, it's easy to imagine
clinics offering it in China and India.
Policy seems largely powerless to fight this problem.
Sex-selective abortion is illegal in virtually all countries.
China's authoritarian "one-child policy" is in marked contrast with
India's more laissez-faire attitude to family planning, yet both
have produced widespread killing of female fetuses.
All of this presupposes a continuing general preference for boys
in such societies, something that should eventually wane as their
economies develop more equal employment opportunities. Given the
way in which technology is evolving to make sex selection easier,
perhaps the only short-term hope is to shame people. South Korea's
sex ratio at birth reached 115 to 100 in the 1990s but has since
fallen back to 107, thanks to what Mr. Eberstadt calls a
"spontaneous and largely uncoordinated congealing of a mass
movement for honoring, protecting and prizing daughters."