RT Journal Article SR Electronic T1 “Inadvertent subtracters” JF The Journal of Portfolio Management FD Institutional Investor Journals SP 4 OP 4 DO 10.3905/jpm.9.3.4 VO 9 IS 3 A1 Peter L. Bernstein YR 1983 UL https://pm-research.com/content/9/3/4.abstract AB