We’ll use our zero-cross image for a MACD trading example. As trading proceeds, you observe the MACD initially crossed the zero line from below, then crossed again from above. A trader might notice the histogram bars moving down with the MACD, indicating a possible reversal and opportunity for a short trade.
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When the line crossed from above, the trader could take a short position and net a profit when the prices began to climb again.
The zero-cross strategy could be used again to take a long position when the MACD crosses the zero line from below. At the point circled in our image, prices have been rising and momentum is up. The trader could take a long position at this point.