This paper computes first the internal rates of return of different population cohorts. Secondly, we study the intragenerational aspects by calculating the returns over life-time contributions for workers of different categories, grouped by earnings, gender and marital status. Under a set of assumptions on contribution rates and wage profiles -in absence of actual data on longitudinal contributions- we show the existence of significant intergenerational effects. They favour older cohorts due basically to the contribution bases applied during the 60s and 70s. Some of these effects follow a rather erratic pattern, mostly due to the changes overtime of the definition of the maximum allowable contribution. These limits play a similar crucial role for the intragenerational analysis, although in general, the social security 'deal' favours high income individuals, women and married males.
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Paper provided by FEDEA in its series Working Papers with number
99-16.
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