Sometimes a market breaks out of a range, moving below the support or above the resistance to start a trend. How does this happen? When support breaks down and a market moves to new lows, buyers begin to hold off. This is because buyers are constantly noticing cheaper prices being established and want to wait for a bottom to be reached. At the same time, there will be traders who are selling in panic or simply being forced out of their positions.
The trend continues until the selling is depleted and belief starts to return to buyers when it is established that the prices will not decline further. Trend-following strategies encourage traders to buy on the markets once they have broken through resistance and sell markets, and when they have fallen through support levels.