Every day, human beings see many groupings, each of which has a series of input and output components. It is argued that one of the main points of these groupings is the necessity of establishing a balance among the input components. Since violating this condition might lead to not only the loss of input sources and its cost, but also it would have a negative impact on the output. Therefore, to avoid the harmful consequences of this imbalance, it is necessary to control the amount of components in proportion to each other and prevent their excessive entry into the grouping. For example, if in cooking (the grouping), salt (the input component) is overused in proportion to the other ingredients, the food (the output component) will be inedible. By controlling the amount of salt, one can avoid wasting raw materials as well as cooking bad tasting food. In contrast to the above set in which the components' entry and control are done in a short time, there are some other groupings in which the components' entry is consecutive; as a result, they require continuous monitoring. Marriage is one of these groupings in which the men and women who are ready to marry are considered as inputs, and the married individuals are regarded as outputs. Given the important principle of proportionality between input components, it is evident that the establishment of balance between the number of men and women when they enter the marriage arena has special significance; lacking which may definitely cause many difficulties. Hence, this book initially investigates whether there is a balance between the input components, i.e., the men and the women who are ready to marry; if not, what is the reason and how long this imbalance would continue? Then, it probes into the question of how the harmful consequences of this imbalance would be reflected in the society. Finally, what solutions can be offered to act as a controller? So that, in addition to preventing the cost of the marriage input components' loss, it would act as a protection for marriage system outputs (the married individuals).