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There is no reason at all for thinking that the average intelligent investor, even with much devoted effort, can derive better results over the years from the purchase of growth stocks than the investment companies specializing in this area. Surely these organizations have more brains and better research facilities at their disposal than you do. Consequently we should advise against the usual type of growth-stock commitment for the enterprising investor.* This is one in which the excellent prospects are fully recognized in the market and already reflected in a current price-earnings ratio of, say, higher than 20. (For the defensive investor we suggested an upper limit of purchase price at 25 times average earnings of the past seven years. The two criteria would be about equivalent in most cases.)† The striking thing about growth stocks as a class is their tendency toward wide swings in market price. This is true of the largest and longest-established companies—such as General Electric and International Business Machines—and even more so of newer and smaller successful companies. They illustrate our thesis that the main characteristic of the stock market since 1949 has been the injection of a highly speculative element into the shares of companies which have scored the most brilliant successes, and which themselves would be entitled to a high investment rating. (Their credit standing is of the best, and they pay the lowest interest rates on their borrowings.) The investment caliber of such a company may not change over a long span of years, but the risk characteristics of its stock will depend on what happens to it in the stock market. The more enthusiastic the public grows about it, and the faster its advance as compared with the actual growth in its earnings, the riskier a proposition it becomes.
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