I am constantly amazed that some of the simplest tools available to technical analysts are often the most effective. One of these simple tools is parallel trendlines. I have used them to identify planes of support and resistance on the charts.
At times, these parallel trendlines will form channels. Commonly, a market will stay within a bounded channel for a sub- stantial period of time. However, these trendlines are not limited to channels of equal width. The weekly corn chart reveals a market which has followed the same angle, or plane, of movement for much of the past three years, but within channels of various widths.
There are three primary applications of this tool which are very useful. The first is to expect a market to respect existing parallel boundaries of support and resistance. Second is to expect a significant change in market action when a boundary is significantly violated. And third is to expect the market to eventually resume trading on a parallel plane at a new level. The weekly corn chart is a good example of all three applications.