Portfolio allocation problems between risky and ambiguous assets

  • Takao AsanoEmail author
  • Yusuke Osaki
Original Research


This paper considers a portfolio allocation problem between a risky asset and an ambiguous asset, and investigates how greater ambiguity aversion influences the optimal proportion invested in the two assets. We derive several sufficient conditions under which greater ambiguity aversion decreases the optimal proportion invested in the ambiguous asset. Furthermore, we consider an international diversification problem as an application and show that ambiguity aversion partially resolves the home bias puzzle.


Uncertainty modelling Home bias puzzle Portfolio allocation problem Smooth ambiguity model Greater ambiguity aversion 

JEL Classification

G11 D81 



We acknowledge an anonymous reviewer whose comments improved this paper substantially. We are grateful to Masamitsu Ohnishi and participants at Paris Financial Management Conference 2017 and the 2017 Annual Meeting of the Nippon Finance Association. Needless to say, we are responsible for any remaining errors. This research is financially supported by the JSPS KAKENHI Grant Nos. 26380240, 26380411, 26705004, 16H02026, 16H03619, 16K03558, 17K03806, and the Joint Research Program of KIER.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Faculty of EconomicsOkayama UniversityOkayamaJapan
  2. 2.Faculty of CommerceWaseda UniversityTokyoJapan

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