PT - JOURNAL ARTICLE AU - Brian R. Bruce TI - Editor’s Letter AID - 10.3905/jii.2018.9.1.001 DP - 2018 May 31 TA - The Journal of Index Investing PG - 1 VI - 9 IP - 1 4099 - https://pm-research.com/content/9/1/1.short 4100 - https://pm-research.com/content/9/1/1.full