The upper and bottom borders of a trade channel forme lines of support and resistance. The peaks represent the price levels at which the selling pressure exceeds the buying pressure are known as resistance levels. The troughs, on the other hand, represent the levels at which the selling pressure succumbs to the buying pressure. They are called support levels. The longer the prices bounce off the support and resistance levels, the more significant the trend becomes.
Trading volume is also very important, especially at the critical support and resistance levels. When the currency bounces off these levels under heavy volume, the significance of the trend increases. The importance of support and resistance levels goes beyond their original functions. If these levels are convincingly penetrated, they tend to turn into just the opposite. A firm support level, once it is penetrated on heavy volume, will likely turn into a strong resistance level. Conversely, a strong resistance turns into a firm support after being penetrated.
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