The primary objective of this paper is to highlight the distinct roles of altruism and of self-interest in the political determination of a public education policy. I assess the relative importance of three factors in the determination of the equilibrium level of this policy: altruism, the impact of public funding of education on social security benefits and its impact on factor prices.I then focus on the impact of implementing a social security system on the equilibrium levels of education funding and on welfare. I find that although, in the benchmark economy, the presence of social security might generate support for public funding of education, its overall effect on the well-being of individuals is negative for any level of social security taxation.JEL Classification: D78, E62, I22.