We all know what it takes to make a successful investor: diversification and holding for the long-term. So why do so many investors insist upon diverting from that game plan?

One big reason, according to Morningstar's Russel Kinnel, is that buying and selling fills an investor's void of not having control over returns. They often think, in other words, that since they don't have control over their returns, they might as well have control over trading.

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