Sufficiency Conditions for Inclusion of One Asset over Another in Investment Portfolios

William Trainor

The Financial Review, 1998, vol. 33, issue 3, 169-82

Abstract: By extending Tsiang's (1972) analysis to encompass two risky assets, sufficiency conditions for including one asset over another in any investor's investment portfolio are derived. This derivation stems from the fact that any realistic utility function must have indifference curves with slopes less than one. Using this model's framework, it is found that short-term Treasury bills in addition to cash balances cannot be a component of investor's investment portfolios. The results have implications for both the risk-free rate used in portfolio analysis and provide a partial solution to Mehra and Prescott's (1985) equity premium puzzle. Copyright 1998 by MIT Press.

Date: 1998
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