We generally define the phenomenon of social mobility as the step from one initial social positioning (the origin) to one final social positioning (the destination). This social positioning can manifest itself in different ways: it can refer to absolute positions (a typical example is the income earned by an individual that allows him or her to be positioned within the income distribution of the entire community). It can refer to relative positions (if, for example, we refer to the income portion from which an individual benefits with respect to the cumulative income of the population). It can refer to ordinal positions (typical in this case is the presence of a school degree or the belonging to a particular social class since these variables can only be ordered by means of qualitative criteria). It can also refer to nominal categories that cannot be ordered (examples are religious and political creeds or also geographical residence).