Contd... The criteria of selecting potential mates is the rather challenge in Nepal due to marriage market environment. We have found in many parts of Nepal especially in Terai, males have strong preferences in property (Daizo) while in some educated family emphasis is for the education. Some people give their preferences to the beauty and handsomeness of their mates while others gives the priority to the status of the family. Many people claim that they marry for love. For girls, doctors and engineers were the main focus in the last few decades because of the opportunity of getting job and earning more money but now the condition is no longer the same and preferences have changed to the business people or lawyers or others. This shows that the preferences also change over time. Although most of the societies in the world are predominated by monogamous unions some societies still practice polygamy. Even within the polygamy, woman with several husbands (polyandrists) is less common than men with several wives (polygynists) because father?s identity is doubtful under polyandry. Although polygamy is not legal in Nepal we can easily see many families with one husband and two or more wives and we also have heard time to time that the brothers of the same family marry one woman in the mid and far-western rural Nepalese societies. There are 2 main reasons of polyandry households in Nepal. The first is the infertility of the woman (Nepalese societies are critical for preserving their future generations) and the other is due to only female birth. The third is Diazo and another also important is the Nepalese cultures which says to show that they are capable ?Capable and Courage man can have 100 wives?. Sex satisfaction is also the main cause of multi-wives family. But one major point to note here is that it is very rare to check without medical verification of fertility of the woman. If woman does not give birth for some time periods after marriage, she is blamed to be unfertile without medical examination. Nepalese societies are male dominated societies and are generally centered the male?s role. This is also now changing nowadays and practices of common understanding between male and female is increasing. More successful men are more likely to be polygamous and they are more likely to have relatively more children. This concept also applies in Nepalese context and the populations of politicians who can earn more money have more than one wives. Decline in the polygamy families in Nepal is due to the legislative restrictions. Laws against polygamy reduce the demand for woman, and thereby reduce their share of total household output and increase the share of men. Due to the mate search that is similar to the searched person is another reason of inequality on family income and distinct classes in the social incomes. The chance of marriage between poor girl and a wealthy boy or vice versa is comparatively low holding other factors of marriage constant. Sorting based on intelligence, race and height also increases the inequality among different families. The education also plays the vital role in social inequalities because educated parents are effective producers of education-readiness to their children. It has also affected to the existence of some societies in Nepal. The chance of a child death is more for the lower income family and this is the reason why Raute and Chepangs populations are decreasing and others are increasing. Inter-caste fertilization and potential talents of inter-caste products are very few in Nepal due to the religious restrictions. The news from Nepal reports about inter-cast marriage difficulties and rejection of such couples from their parent?s homes. This is the main cause of few inter-cast marriages. Many attempts are being done in order to avoid such conditions but till date, the social concepts of intercast marriage has not changed yet and it looks like not changing for few decades to come. Another important aspects of marriage theory are when to marry, how long to stay married, when to remarry if divorced or widowed. These are all difficult questions to answer. The early age of entry in the marriage market is either due to family pressure, sexual desires, desire of large number of children, the higher the expected income and the lower the level of education. For girls in Nepal, the marriage age is between 15-20 because of the religious beliefs and parents decisions to marry. The religious thinking of parents that they should marry their daughters before menstruation is the major cause of early marriage in Nepal. Once he or she enters the marriage market, he is expected to search until the value to him of any expected improvement in the mate he can find is no greater than the cost of time and other inputs for additional search. Since benefits will be greater the longer the expected duration of the marriage, people is search more carefully and marry later when they expect to be married longer eg. if divorce is not common for him. The general principle is that the people will marry early if they are lucky in their search. Early marriage contains generally lucky and pessimistic persons while later marriage contain unlucky and optimistic ones. The cost of search also differs greatly and optimal allocation of search expenditures.