If you know the secrets of a company, if you know some good news about the company before the public does, you could buy the shares of the company and experience the profit when the price goes up.

如果你掌握了公司内幕信息,你能比公众更早得知,公司的利好消息,那你就会去购买公司的股票,然后从股票升值中获利

耶鲁公开课 - 金融市场课程节选