In my neck of the woods, the 50% line is considered fairly neutral. 38% and 62% are the key lines. In a lot of cases, when price breaks either of these lines, you're looking at price making a full retracement/extension (0% when it breaks 38%) or (100% if it breaks 62%).
In some circles, people set their stop loss at the 50% line as it makes for a very nice profit to loss ratio.
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