PT - JOURNAL ARTICLE AU - Bruce, Brian TI - Editor’s Letter AID - 10.3905/jii.2021.12.2.001 DP - 2021 Aug 31 TA - The Journal of Index Investing PG - 1--2 VI - 12 IP - 2 4099 - http://jii.pm-research.com/content/12/2/1.short 4100 - http://jii.pm-research.com/content/12/2/1.full