Ambiguity aversion and optimal derivative-based pension investment with stochastic income and volatility. (English) Zbl 1401.91212
Summary: This paper provides a derivative-based optimal investment strategy for an ambiguity-adverse pension investor who faces not only risks from time-varying income and market return volatility but also uncertain economic conditions over a long time horizon. We derive a robust dynamic derivative strategy and show that the optimal strategy under ambiguity aversion reduces the exposures to market return risk and volatility risk and that the investor holds opposite positions for the two risk exposures. In the presence of a derivative, ambiguity has distinct effects on the optimal investment strategy. More important, we demonstrate the utility improvement when considering ambiguity and exploiting derivatives and show that ambiguity aversion and derivative trading significantly improve utility when return volatility increases. This improvement becomes more significant under ambiguity aversion over a long investment horizon.
MSC:
| 91B30 | Risk theory, insurance (MSC2010) |
| 91G10 | Portfolio theory |
Keywords:
robust portfolio choice; DC pension plan; ambiguity; derivative; stochastic volatility; stochastic salaryReferences:
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