2000: Those formulas that gain adherents and importance do so because they have worked well over a period, or sometimes merely because they have been plausibly adapted to the statistical record of the past. But as their acceptance increases, their reliability tends to diminish. This happens for two reasons: First, the passage of time brings new conditions which the old formula no longer fits. Second, in stock-market affairs the popularity of a trading theory has itself an influence on the markets behavior which detracts in the long run from its profit-making possibilities.
–Benjamin Graham, The Intelligent Investor (New York: HarperBusiness, 2003), p. 191.
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Jason is the author of “Your Money and Your Brain,” on the neuroscience of investing, and the editor of the revised edition of Benjamin Graham’s “The Intelligent Investor,” the classic text that Warren Buffett has described as “by far the best book about investing ever written.”







