RT Journal Article SR Electronic T1 Exactly What do You Mean by Speculation? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 29 OP 39 DO 10.3905/jpm.1993.29 VO 20 IS 1 A1 Martin S. Fridson YR 1993 UL https://pm-research.com/content/20/1/29.abstract AB