Quote from tradersaavy:
Let's see what happens in this real time chart.
The red uptrend line can be useful in many ways. A few examples:
If someone is long, may use it for a stop.
If someone is looking to go long, the line may be a place to buy.
Looking to go short, should price come back to the line, hug it, and then break down; may be a good short.
How can it be a useful point to place a stop to liquidate longs as well as a possible point to go long?
