Marriage can be viewed in economic terms as an investment, an outlay of capital by the man’s family before and at the time of the wedding which yields returns over the subsequent period. Returns take a variety of forms, depending on the rights and obligations associated with marriage in a given society. Bambara society in Kala is patriarchal, and lineage-based, in which bride-wealth is paid by the man’s family to that of the woman’s family. Control over childbearing is one of several rights which pass on marriage, along with a woman’s labour power, in the millet-field and in domestic arenas. A woman’s income and resources, and the links of support between her and her natal households, are also valuable elements which come with marriage. Being married is seen as a fundamental and necessary state, very few women remain unmarried for long, polygamy and widow inheritance are practiced, and rates of remarriage are very high. The chapter compares the costs of and returns from marriage. These costs and returns have been changing over time and do patterns of marriage. Marriage also faces certain risks, from mortality, illness, sterility, and marital breakdown.