Media type: E-Article Title: On the optimal size of Social Security in the presence of a stock market Contributor: Hillebrand, Marten Published: Elsevier BV, 2012 Published in: Journal of Mathematical Economics, 48 (2012) 1, Seite 26-38 Language: English DOI: 10.1016/j.jmateco.2011.11.002 ISSN: 0304-4068 Keywords: Applied Mathematics ; Economics and Econometrics Origination: Footnote: