Comparative statics and portfolio choices under the phantom decision model

Hideki Iwaki, Yusuke Osaki

Research output: Contribution to journalArticle

2 Citations (Scopus)


This study characterizes attitudes toward uncertainty in the phantom decision model introduced by Izhakian and Izhakian (2015) and conducts a comparative statics analysis to examine how changes in phantom uncertainty and phantom aversion affect portfolio choices. First, “phantom averse” and “more phantom-averse” are defined in a manner that differs from Izhakian and Izhakian (2015). Assuming that utility functions have realization forms, the above notions are characterized by the shapes of their reduction components. For the portfolio choice problem that consists of one safe asset and one phantom asset, we derive sufficient conditions under which changes in phantom uncertainty and phantom aversion monotonically decrease the investment in the phantom asset. Some familiar concepts in expected utility theory are extended to the framework of the phantom decision model.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Banking and Finance
Publication statusPublished - 2017 Nov 1
Externally publishedYes



  • Comparative statics
  • Phantom aversion
  • Phantom decision model
  • Portfolio choice
  • Uncertainty

ASJC Scopus subject areas

  • Finance
  • Economics and Econometrics

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