The literature related to the social security systems is devoted to the calculation of aspects and implications regarding the privatization of the system, the elaboration of macroeconomic models and the effects this change could lead to. This paper studies the most relevant approaches on the...

The evidence of the contribution’s base is realized in a national information system only since April 2001. Previous to this period is the “contest” of certificates which prove incomes not registered in employment records. This competition depends at the level of each person on the keeping...