Does China have a problem with the gender imbalance? If so, how big of problem?

Economics at work! Compare this article from the BBC (echoing what I believe to be the ‘general’- rather gloomy!- perspective on China’s gender imbalance) and the viewpoints of economists Gary Becker and Richard Posner, who start from discussing whether there is any valid case for forbidding the ‘sex selection’ practice, but end up discussing a series of wider implications.
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