Fu, Fangjian - In: Journal of Financial Economics 91 (2009) 1, pp. 24-37
Theories such as Merton [1987. A simple model of capital market equilibrium with incomplete information. Journal of Finance 42, 483-510] predict a positive relation between idiosyncratic risk and expected return when investors do not diversify their portfolio. Ang, Hodrick, Xing, and Zhang...