PT - JOURNAL ARTICLE AU - Brian R. Bruce TI - Editor’s Letter AID - 10.3905/jii.2015.6.1.002 DP - 2015 May 31 TA - The Journal of Index Investing PG - 2 VI - 6 IP - 1 4099 - https://pm-research.com/content/6/1/2.short 4100 - https://pm-research.com/content/6/1/2.full