RT Journal Article SR Electronic T1 Faith, reason, and prudence JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 3 DO 10.3905/jpm.1987.409096 VO 13 IS 2 A1 Peter L. Bernstein YR 1987 UL https://pm-research.com/content/13/2/1.abstract AB