The Chinese problem of too many boys can certainly not be referred to as an "unintended consequence." Chinese family culture revolves around the idea that boys are more desirable than girls, and I seriously doubt that Chinese leaders failed to take this into account when they implemented the one child policy. I think they just didn't care, because they bought into the "boys are better than girls" mentality.
The real unintended consequence of a huge excess of men vs women in Chinese society is likely to be social and political destabilization. A large number of these men will be from the lower end of the economic spectrum, and sociologists agree that a group of under- or un-employed single men is a recipe for crime and rebellion.
A Demographic Perspective on ETFs [View article]
The real unintended consequence of a huge excess of men vs women in Chinese society is likely to be social and political destabilization. A large number of these men will be from the lower end of the economic spectrum, and sociologists agree that a group of under- or un-employed single men is a recipe for crime and rebellion.