Zhelko Dimic
Careful bull
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The reason why the predictive strength of technical analysis is limited to the point of being useless, is that any mechanism that could cause a stock price to move in a given direction is canceled out by changes in supply and demand, when the market tries to cash in on that mechanism causing an equally sized movement in the opposite direction.
This is second time you made pretty much the same error. I've corrected you first time, and you didn't answer, just to repeat this blunder again. So here we go: that bolded part above? you are wrong, these mechanisms are self-reinforcing, and not self-cancelling. Eventually they do get exhausted, but not before SP overshoots what should have happened if they were not in place.
And if you are not practitioner of technical analysis, I don't see how can you so confidently claim it's useless. You definitely have less experience than many practitioners, and they seem to think it's useful.
You are right that technical analysis cannot predict price with any precision, it can just give you confidence bands for possible future SP movements, but that is not useless if you are an active trader. If you are investor, yup, it's mostly useless.
And technical analysis is based on (human) psychology of the crowds, greed and fear patterns, not star gazing. As with any overtly complex systems that we can't model (like weather forecasting), it is not precise and it never will be. It's also a harder problem than weather forecast as it involves humans, that are less predictable (or better said: harder to model) than physics of the atmosphere. So, yes, it is less precise than weather forecasting, but in it's nature is very similar.