TY - JOUR T1 - Editor’s Letter JF - The Journal of Index Investing SP - 1 DO - 10.3905/jii.2021.12.3.001 VL - 12 IS - 3 AU - Brian R. Bruce Y1 - 2021/11/30 UR - https://pm-research.com/content/12/3/1.abstract N2 - ER -