Chart reading does perfect due dilligence. All of you fundamental guys are doing the DD for the charts. Your buy and sell decision causes both volume and direction. When the charts start to move up its because people are anticipating good news and it gets priced into the stock before the news ("buy the rumor, sell the news?") Technical analysis has been longer than you and I have been alive.
When you see steep selloffs in stocks on extraordinary volume dont stand in front of the train and yell STOP - you get run over ("The trend is your friend?"). The chart could have told you that 30% ago.
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