"The stock market is but a mirror which provides an image of the underlying or fundamental economic situation. Cause and effect run from the economy to the stock market, never the reverse. In 1929 the economy was headed for trouble. Eventually that trouble was violently reflected in Wall Street."

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Direct interference in a person's life does not enter our scope of activity, nor, on the other, tralatitiously speaking, hand, is his destiny a chain of predeterminate links: some 'future' events may be linked to others, O.K., but all are chimeric, and every cause-and-effect sequence is always a hit-and-miss affair, even if the lunette has actually closed around your neck, and the cretinous crowd holds its breath.

— Vladimir Nabokov