PT - JOURNAL ARTICLE AU - Rob Arnott TI - Invited Editorial Comment AID - 10.3905/jpm.2012.39.1.001 DP - 2012 Oct 31 TA - The Journal of Portfolio Management PG - 1--2 VI - 39 IP - 1 4099 - https://pm-research.com/content/39/1/1.short 4100 - https://pm-research.com/content/39/1/1.full