RT Journal Article SR Electronic T1 Hedging, Speculation, and Systemic Risk JF The Journal of Derivatives FD Institutional Investor Journals SP 6 OP 8 DO 10.3905/jod.1995.407925 VO 2 IS 4 A1 Fischer Black YR 1995 UL https://pm-research.com/content/2/4/6.abstract AB