Some people may be compulsive gamblers, but they are actually consummate professionals who know at what point they have had tolerable loss at the gaming table, and then decide to call it quits. Speculation at the stock market bears a striking similarity to this. A good speculator knows that he must establish a limit to his loss, deciding that, if his stock should decline by as much as, say, five points below its cost, it's probably wise to sell, thereby limiting his loss to those five points. Conversely, the price we pay for our moments of anxiety, or for our seasons of worry, are sometimes a
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