JLS - It has always amazed me that people will accept as truth that which they believe in most passionately, even though it may contradict other beliefs or that there is no proof one way or the other. They only need to see a correlation once to accept that the relationship is always true, and completely dismiss the notion that it could have been a mere coincidence. If they are religious, the survivors of a catastrophe will invariably attribute their salvation to divine intervention, when in fact it may have been just dumb luck. Ask anyone if they believe in ghosts and they will likely say of course not, but it is a central tenet of most of the world's religions.
Regarding trading systems in particular, they are generally more art than science, but what counts is the ability to use them consistently for profit, so what does it really matter if they require a leap of faith? Also, the degree to which a particular methodology is utilized, e.g. Fibonacci ratios as S/R lines, can be self-fulfilling.
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