because traders do not care about that and arbitragers do not have abilities to cover everythingQQQ is supposed to be 1/40 of its index
hi, when yesterday (Feb 20, 2018) NASDAQ 100 index was closed at 6,779.70, the QQQ was closed at 165.29. QQQ is supposed to be 1/40 of its index, but 165.29*40=6611.6, less than 168 points. Why such a large deviation? Thanks.