RT Journal Article SR Electronic T1 How Speculative was the Bull Market? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 1 DO 10.3905/jpm.15.1.1 VO 15 IS 1 A2 Peter L Bernstein YR 1988 UL https://pm-research.com/content/15/1/1.abstract AB