The rich world can produce more of everything it needs with greater and greater ease: except people. For a population to remain stable, the average family needs to have 2.1 children: two to replace them, with the rather surreal sounding “0.1” on top to make up for the people who won’t, for reasons of infertility, preference or bad luck, be able to have children themselves.
富裕国家可以越来越轻松地生产更多它所需要的任何东西：除了人。要想保持人口稳定，平均每个家庭需要生育2.1个孩子：其中两个用来替代他们自己，再加上听起来相当荒诞的“0.1”来弥补那些因不孕不育、偏好或运气不好而自身未能生育的人。
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