RT Journal Article SR Electronic T1 “The Behavior of Equity and Debt Risk Premiums” JF The Journal of Portfolio Management FD Institutional Investor Journals SP 98 OP 100 DO 10.3905/jpm.1994.409488 VO 20 IS 4 A1 Roger G. Ibbotson A1 Scott L. Lummer YR 1994 UL https://pm-research.com/content/20/4/98.abstract AB