PT - JOURNAL ARTICLE AU - Bruce, Brian R. TI - Editor’s Letter AID - 10.3905/jii.2019.10.1.001 DP - 2019 May 31 TA - The Journal of Index Investing PG - 1 VI - 10 IP - 1 4099 - http://jii.pm-research.com/content/10/1/1.short 4100 - http://jii.pm-research.com/content/10/1/1.full