RT Journal Article SR Electronic T1 The more things changeā€¦ JF The Journal of Portfolio Management FD Institutional Investor Journals SP 4 OP 4 DO 10.3905/jpm.1982.408864 VO 8 IS 3 A1 Peter L. Bernstein YR 1982 UL https://pm-research.com/content/8/3/4.abstract AB