Mark Twain effect
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In some stock markets, the Mark Twain effect is the phenomenon of stock returns in October being lower than in other months. The name comes from a line in Mark Twain's Pudd'nhead Wilson: "October. This is one of the peculiarly dangerous months to speculate in stocks. The others are July, January, September, April, November, May, March, June, December, August, and February."
The quotation is a sarcastic assertion that speculation in stocks is always dangerous. The fact that Twain specifically picks out October initially is taken as a reference to an "October effect", as exemplified by the 1929, 1987 and 2008 stock market crashes which roughly occurred in October.
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