PT - JOURNAL ARTICLE AU - Richard C. Grinold TI - The fundamental law of active management AID - 10.3905/jpm.1989.409211 DP - 1989 Apr 30 TA - The Journal of Portfolio Management PG - 30--37 VI - 15 IP - 3 4099 - https://pm-research.com/content/15/3/30.short 4100 - https://pm-research.com/content/15/3/30.full