Any EMA crossing the zero line triggers the zero-cross strategy. If the MACD crosses the zero line from below, a new upswing is likely; if it crosses from above, a recent drop is likely. Because this is the slowest of the three signals, traders will see fewer signals and fewer false reversals. If the MACD crosses above the zero line, buy or sell a short trade. When it crosses below the zero line, sell or close the long position. Because of the delayed nature of the signals, which frequently arrive too late, this method should be used with caution in fast, volatile markets. This method of sending reversal signals for large sweeping gains, on the other hand, can be extremely useful.