169. Corporate officers and directors commonly buy and sell, for their own portfolios投资组合, stock in their own corporations. Generally, when the ratio of such inside sales to inside purchases falls below 2 to 1 for a given stock, a rise in stock prices is imminent. In recent days, while the price of MEGA Corporation stock has been falling, the corporation's officers and directors have bought up to nine times as much of it as they have sold. 可不可以拜求整段中文解释 inside sales to inside purchases 是只助理类的职称还是另有其他解释
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