THE FAN PRINCIPLE

posted under by ceecabolos
This brings us to another interesting use of the trendline—the fan principle. (See Figures 4.11a-c.) Sometimes after the violation of an up trendline, prices will decline a bit before rallying back to the bottom of the old up trendline (now a resistance line). In Figure 4.11a, notice how prices rallied to but failed to penetrate line 1. A.second trendline (line 2) can now be drawn, which is also broken. After another failed rally attempt, a third line is drawn (line 3).
The breaking of that third trendline is usually an indication that prices are headed lower. In Figure 4.11b, the breaking of the third down trendline (line 3) constitutes a new uptrend signal. Notice in these examples how previously broken support lines became resistance and resistance lines became support. The term "fan principle" derives from the appearance of the lines that gradually flatten out, resembling a fan. The important point to remember here is that the breaking of the third line is the valid trend reversal signal.

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