Abstract: Well-known song in the Soviet Union with the following lyrics: "For ten girls there are just nine boys" was reflecting the situation of gender imbalance, which was observed in the country. Although current Russian statistics do not confirm the misbalanced sex ratio at the marriageable market, there is some evidence that this belief exists among Russians. According to Lafortune (2013) when the men are in short supply, women are investing more than men premaritally even when the returns are lower or the costs are higher for them. So we hypothesize that the more women believe that there are few appropriate partners, the more they engage in pre-marital investments.