"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."
"The investor is neither smart not richer when he buys in an advancing market and the market continues to rise. That is true even when he cashes in a goodly profit, unless either (a) he is definitely through with buying stocks an unlikely story or (b) he is determined to reinvest only at considerably lower levels. In a continuous program no market profit is fully realized until the later reinvestment has actually taken place, and the true measure of the trading profit is the difference between the previous selling level and the new buying level."
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Source: The Intelligent Investor: The Classic Text on Value Investing. Book by Benjamin Graham, Chapter II, The Investor and Stock-Market Fluctuations, p. 25, 1949.
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