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Past behavior of a market is a very poor predictor of short-term behavior. But over many, many samples, patterns emerge. That is what we exploit.
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Markets have personality. They have tendencies. Momentum tends to continue. Overextension tends to revert. These patterns exist because people exist.
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I have one edge: I have been watching these patterns for forty years. The market keeps making the same moves. I just have to be patient enough to wait for them.