Modeling the impact of aging on social security expenditures

In this paper we survey the features of different approaches available in the literature used to study the effects of the aging of the population on Social Security expenditures. We comment on the weaknesses and strengths of each of them, and perform a quantitative analysis by comparing the results they imply in the particular case of the Spanish economy. Finally, we highlight some elements of the modeling strategies on which more evidence is needed for a correct evaluation of the problem at hand.