犹如我学习的许多事物一样，这项原则也来自于惨痛的教训。20世纪70年代中期，我在INA上建立一个很小的期权头寸。我买进20份12月份到期且执行价格为25美元的看涨期权，价格为1（每份合约125美元）。我买进之后不久，股价开始下跌，期权的价格先是下跌1/8（每份合约12.5美元），接着出现1/4（每份合约25美元）的跌幅。根据我当时交易期权的法则，当我损失1/4时便应认赔出场，然而，我当时不仅没有接受500美元的损失，反而以3/8的价格出售60份12月份到期且执行价格为30美元的看涨期权
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