He, Xue-Zhong; Shi, Lei - Finance Discipline Group, Business School - 2008
Words: Heterogeneity, bounded rationality, heterogeneous CAPM, mean-variance
efficiency, Sharpe and Treynor ratios.
JEL … the market
performance.
8 HE AND SHI
3. ONE FUND THEOREM AND MEAN-VARIANCE EFFICIENCY
In the standard mean … portfolios under the subjective
beliefs, the market aggregation improves (worsens) the mean-variance efficiency of the
optimal …