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2Aaron, H. J., 1966, "The Social Insurance Paradox", Canadian Journal of Economics, vol. 32
3John B. Williamson, Matthew Williams, 2003, "Tne Notional Defined Contribution Modeh an Assessment of the Strengths and Limitations of a New Approach to the Provision of Old Age Security", CRR WP2003 - 18
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5Martin Feldstein, Jeffrey B. Liebman, 2001, "Social Security", NBER working paper8451
6Ole Settergren and Boguslaw D. Mikula, 2006, “The Rate of Return of Pay - As - You - Go Pension Systems: A More Exact Consumption- Loan Model of Interest”, in Robert Holzmann, Edward Palmer (eds.), Pension Reform: Issues and Prospects for Non- Financial Defined Contribution (NDC) Schemes, Washington, DC, World Bank
