RT Journal Article SR Electronic T1 How bad were the good old days? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 2 DO 10.3905/jpm.1990.409258 VO 16 IS 2 A1 Peter L. Bernstein YR 1990 UL https://pm-research.com/content/16/2/1.abstract AB