Some of my best friends are only-children

Little Emperors: Behavioral Impacts of China’s One-Child Policy
L. Cameron, N. Erkal, L. Gangadharan, X. Meng
We document that China’s One-Child Policy (OCP), one of the most radical approaches to limiting population growth, has produced significantly less trusting, less trustworthy, more risk-averse, less competitive, more pessimistic, and less conscientious individuals. Our data were collected from economics experiments conducted with 421 individuals born just before and just after the OCP’s introduction in 1979. Surveys to elicit personality traits were also used. We used the exogenous imposition of the OCP to identify the causal impact of being an only child, net of family background effects. The OCP thus has significant ramifications for Chinese society.
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Maybe my favorite aspect of the study is not the content but the design: analyzing cohort effects using [a battery of] lab experiments.

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