Efficiency loss and constraints on portfolio holdings

Abstract

This paper examines the degree of portfolio inefficiency subject to various constraints on portfolio weights. When portfolio weights are unconstrained, the posterior loss in expected return on the NYSE-AMEX market portfolio is over 20% (annualized). In contrast, when portfolio weights are constrained to be nonnegative, the posterior loss in expected return is only about 4% (annualized). In addition, short-sale constraints greatly reduce uncertainty in inferences about portfolio efficiency.

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