Sex and the City
研究发现工业化国家城市中年轻女性多于男性，这可能与城市中男性收入较高有关，因为高收入男性不仅吸引高技能女性，也吸引低技能女性，导致城市女性过剩。瑞典数据支持这一结论。
Abstract Throughout the industrialized world, young women outnumber young men in urban areas. This paper proposes that such a pattern may be linked to higher male incomes in urban areas. The argument is that urban areas offer skilled workers better labor markets. Assuming that there are more skilled males than females, this alone would predict a surplus of males. However, the presence of males with high incomes may attract not only skilled females but also unskilled females. Thus, a surplus of women in urban areas may result from a combination of better labor and marriage markets. Swedish municipality data support the results.