RT Journal Article SR Electronic T1 Valuation Ratios and the Long-Run Stock Market Outlook JF The Journal of Portfolio Management FD Institutional Investor Journals SP 11 OP 26 DO 10.3905/jpm.24.2.11 VO 24 IS 2 A1 John Y. Campbell A1 Robert J. Shiller YR 1998 UL https://pm-research.com/content/24/2/11.abstract AB