Keynes Meets Markowitz: The Trade-Off Between Familiarity and Diversification
AbstractWe develop a model of portfolio choice to nest the views of Keynes, who advocates concentration in a few familiar assets, and Markowitz, who advocates diversification. We use the concepts of ambiguity and ambiguity aversion to formalize the idea of an investor's "familiarity" toward assets. The model shows that for any given level of expected returns, the optimal portfolio depends on two quantities: relative ambiguity across assets and the standard deviation of the expected return estimate for each asset. If both quantities are low, then the optimal portfolio consists of a mix of familiar and unfamiliar assets; moreover, an increase in correlation between assets causes an investor to increase concentration in familiar assets (flight to familiarity). Alternatively, if both quantities are high, then the optimal portfolio contains only the familiar asset(s), as Keynes would have advocated. In the extreme case in which both quantities are very high, no risky asset is held (nonparticipation). This paper was accepted by Brad Barber, Teck Ho, and Terrance Odean, special issue editors.
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Bibliographic InfoArticle provided by INFORMS in its journal Management Science.
Volume (Year): 58 (2012)
Issue (Month): 2 (February)
investment; portfolio choice; ambiguity; robust control; underdiversification;
Other versions of this item:
- Boyle, Phelim & Garlappi, Lorenzo & Uppal, Raman & Wang, Tan, 2010. "Keynes Meets Markowitz: The Trade-off Between Familiarity and Diversification," CEPR Discussion Papers 7687, C.E.P.R. Discussion Papers.
- D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty
- G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
- G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
- G23 - Financial Economics - - Financial Institutions and Services - - - Non-bank Financial Institutions; Financial Instruments; Institutional Investors
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