The investor’s portfolio of common stocks will represent a small cross-section of that immense and formidable institution known as the stock market. Prudence suggests that he have an adequate idea of stock-market history, in terms particularly of the major fluctuations in its price level and of the varying relationships between stock prices as a whole and their earnings and dividends. With this background he may be in a position to form some worthwhile judgment of the attractiveness or dangers of the level of the market as it presents itself at different times. By a coincidence, useful statistical data on prices, earnings, and dividends go back just 100 years, ...

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