RT Journal Article SR Electronic T1 The Causes (and Cures?) of Market Volatility JF The Journal of Portfolio Management FD Institutional Investor Journals SP 21 OP 25 DO 10.3905/jpm.1976.408557 VO 2 IS 2 A1 Steven C. Leuthold YR 1976 UL https://pm-research.com/content/2/2/21.abstract AB