RT Journal Article SR Electronic T1 “The age of prophets and witches is upon us” JF The Journal of Portfolio Management FD Institutional Investor Journals SP 4 OP 4 DO 10.3905/jpm.1982.408868 VO 8 IS 4 A1 Peter L. Bernstein YR 1982 UL https://pm-research.com/content/8/4/4.abstract AB