Polygyny has several economic, social, and health advantages over monogamy. In most cultures, women contribute significantly to the wealth of the household and can thus materially benefit from the labour of an additional spouse.
Social structure controls the behavior of the members of a society in different ways.
The structure of a society is what groups its members according to factors such as class, age and so on.
The members of each group in a social structure are expected to behave in a certain manner, Like in the social structure, children are subordinates and therefore are supposed to be adherent to their parents.