"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 does not always price stocks the way an appraiser or a private buyer would value a business. Instead, when stocks are going up, he happily pays more than their objective value; and, when they are going down, he is desperate to dump them for less than their true worth."
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Source: Storage and Stability. Book by Benjamin Graham. Part II, Chapter IV, A Plan For Conserving Surplus, p. 50, 1937.
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