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Why the volume disparity between NUGT and DUST?
NUGT and DUST are opposites - DUST is a 'bear' (tracks 3x the inverse) and NUGT is a 'bull' (tracks 3x the actual).  So if NUGT is much higher, sounds like people are betting on Gold (or specifically, on the NYSEARCA Gold Miners Index).   When this Investopedia article was written in July 2016, the volumes were reversed: DUST traded ~18m and NUGT traded ~7m.  Just differences in stock market activity.