We study aversion to model ambiguity and misspecification in dynamic portfolio choice. Investors with relative risk aversion gamma 1 fear return persistence, while risk-tolerant investors (0 gamma 1) fear return mean reversion, to confront model misspecification concerns when facing a model...

For life insurance companies and pension funds, it is always the case in practice that not all of the risks in their books can be hedged. Hence, the standard Black-Scholes methodology cannot be applied in this situation. This paper discusses and compares several methods that have been proposed...