In 1979 China instituted the one-child policy, which limited every family to just one offspring in a controversial attempt to reduce the country's burgeoning population. The strictly enforced law had the desired effects: in 2011 researchers estimated that the policy prevented 400 million births. In a new study in Science , researchers find that it has also caused China's so-called little emperors to be more pessimistic, neurotic and selfish than their peers who have siblings.
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