Wedge pattern are very common in price movements. Learn three ways to trade the pattern and how to apply the Elliott Wave Theory to anticipate the movement.
A double top or bottom is a very powerful chart pattern. It tells us, that the market was not able to break the support or resistance zone. It also tells us, that supply or demand was big enough to drive price away from the zone. As you can read in my article about horizontal support and resistance, it is more of a zone or area where a double top occurs, then an exact line it has to touch to be valid.