TY - JOUR T1 - Efficiency and Opportunity JF - The Journal of Portfolio Management SP - 4 DO - 10.3905/jpm.1977.408619 VL - 4 IS - 1 AU - Peter L. Bernstein Y1 - 1977/10/31 UR - https://pm-research.com/content/4/1/4.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -