"Most of the time common stocks are subject to irrational and excessive price fluctuations in both directions as the consequence of the ingrained tendency of most people to speculate or gamble... to give way to hope, fear and greed."
"Mr. Market's job is to provide you with prices; your job is to decide whether it is to your advantage to act on them. You no not have to trade with hime just because he constantly begs you to."
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Source: Benjamin Graham (2009). “The Intelligent Investor, Rev. Ed”, p.8, Harper Collins
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