Øystein Thøgersen, Kine Bøhlerengen
Alternative Risk-Sharing Mechanisms of Social Security
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Adopting a portfolio choice approach to pension design, we derive illuminating closed form solutions for optimal pay-as-you-go social security programs. We demonstrate that the nature of the implied risk-sharing effects and their magnitudes are sensitive to the stochastic specification of aggregate wage income growth (i.e. the implicit return on the pay-as-you-go program). Considering individuals in any generation from a »Rawlsian«, prebirth perspective, fairly large pay-as-you-go programs in terms of the magnitude of the optimal contribution rate can be rationalized if wage shocks are not permanent.