RT Journal Article SR Electronic T1 World wealth JF The Journal of Portfolio Management FD Institutional Investor Journals SP 4 OP 23 DO 10.3905/jpm.1985.409036 VO 12 IS 1 A1 Roger G. Ibbotson A1 Laurence B. Siegel A1 Kathryn S. Love YR 1985 UL https://pm-research.com/content/12/1/4.abstract AB