The trading commissions will eat up all of your profits and professionals know that, so it's bad behavior.

交易佣金会吃掉你所有的利润,内行人知道这点,这是不道德的行为

耶鲁公开课 - 金融市场课程节选

It's one of the most rapidly changing, hard to keep up with areas because someone can set up an electronic exchange overnight and suddenly become a base for trading trillions of dollars of securities.

经纪业是一个变化最快的行业之一,人们很难跟上它的步伐,因为人们可以在头一天晚上,设置一个电子交易,一夜之间,他就能在证券市场赚到千亿美金

耶鲁公开课 - 金融市场课程节选