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If only I read this 10 or 15 years ago !
The problem is not that investment research is not done well. The problem is that research is done so very well by so many. Research analysts at major brokerage firms share their information and evaluations almost instantly through global networks with thousands of professional investors who strive to act quickly in anticipation of how others will soon act. As a result, it is very hard to gain and sustain a repetitive useful advantage over all the other investors on stock selection or price discovery.