Fast moving average indicator is a follow-up indicator or it is also called a lagging indicator, which means it does not predict future market directions, but rather reflects current situation on the market. This characteristic makes it vulnerable:firstly, because it can change its signals any time, secondly – because need to watch it all the time; and finally, when market trades sideways (no trend) with very little fluctuation in price it can give many false signals, so it is not suggested to use it during such periods.