いとこ婚
Cousin marriage normally results in a reduced mahr in Islam. Patai states that bride price to a cousin is usually about half as high as to a nonrelative. Due to the poverty of many families this outlay often requires exceptional effort, and especially because the decision traditionally is in the hands of the groom's father, these considerations may weigh heavily on the outcome. The bride's family moreover is expected to spend much of the bride price on the bride herself, so there is a reduced incentive to gain a higher price by avoiding cousin marriage.