RT Journal Article SR Electronic T1 Why Active Fund Managers Often Underperform the S&P 500 JF The Journal of Wealth Management FD Institutional Investor Journals SP 13 OP 26 DO 10.3905/jwm.1998.13 VO 1 IS 1 A1 David L. Ikenberry A1 Richard L. Shockley A1 Kent L. Womack YR 1998 UL https://pm-research.com/content/1/1/13.abstract AB