We propose a single-period portfolio selection model which allows the decision maker to easily deal with uncertainty about the distribution of asset returns. The model is preference-based and relies upon a separate parametrization of risk aversion and ambiguity aversion. A particular...

Optimal Portfolio Theory prescribes that investors reduce their exposure to financial market risk as they get near to retirement. To assess the effect of ageing on portfolio choices, we study the case of an Italian defined contribution pension fund during the period 2002-08. We find that on...