In addition to the ethical concerns mentioned, issues of demographics arise in societies where social sex selection is common. A society may exhibit a widespread bias towards having children of a specific gender, either due to cultural biases or economic concerns (e.g. male children may be more employable in the future and thus provide more financial support). When combined with frequent social sex selection, this bias may produce a gender imbalance that has undesirable consequences. This phenomenon has been observed in many nations in the Far East, such as India and China, where social sex selection has produced unnaturally high male/female ratios in the population. Couples in these areas use reproductive technologies to choose the sex of their children, which ultimately leads to a skew the human sex ratio toward a disproportionately male population. Sex selection has also been detected in several countries of Eastern Europe such as Albania or Azerbaijan. A 2012 report by UNFPA estimates that the total gender gap due to prenatal and postnatal gender discrimination amounts to 117 million women. China's gender imbalance is further increased by the One Child Policy, although applicable only in most urban populations. In these nations, a lack of opportunity for many men to marry is believed to be producing increases in crime, demand for prostitution, mass emigration, and the selling of brides.