Traders must understand support and resistance if they are going to trade profitably, and there are many more forms of support and resistance than what are usually discussed. In particular, there are many measured move targets that the computer algorithms chase, but are never mentioned anywhere. You can learn to spot them if you study charts and keep asking yourself, "Why did the market just do that?" Everything has to make sense, so if something happens and you do not understand why, assume that you are missing something. Over time, you will miss less and less and eventually you might conclude that every tick matters and makes sense.
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