Even though I believe there must be some form of technical analysis that does have predictive power, the mental model of investing which I have constructed does not allow for such a form of technical analysis. In other words: logically, there must be an effective form of technical analysis, but practically, I pretend there isn’t.

Why? Because I believe that’s the most useful model. One should adopt the most useful model not the most honest model. I’m willing to pretend technical analysis does not work, even though I know some form of it must work.

Really, this isn’t all that strange. In science, I’m willing to pretend there are random events, even though I know there must not be random events. In math, I’m willing to pretend zero is a number, even though I know it must not be a number. A model with random events is useful. In most circumstances, a refusal to allow for random events would be harmful rather than helpful. The model with random events is simpler and more workable. The situation is much the same with zero. It isn’t a number. To include zero as a number, you would have to put aside the principles of arithmetic. So, we don’t do that. In school, you were taught that zero is a number, but that there are certain things you must never do with zero. You accepted that, because it was a simple, workable model.

I propose you do much the same in the case of technical analysis. You should recognize the logical validity of technical analysis, but create a mental model of investing in which technical analysis has no utility whatsoever.

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