And if I'm the tax collector, the way I make a profit is by charging you a lot more than I need just to send to Rome.

如果我是税吏，就会收你们一大笔钱,远多于需要上缴的数目，以赚取利润。

耶鲁公开课 - 新约课程节选

Then later on,whenever you want, you can take your money out Meanwhile, they invest the deposits some way or another at a higher interest rate than they pay on the deposits and they make the difference and that's how they make a profit.

然后你什么时候需要你就可以把钱取出来,同时储蓄机构以比给你的利息,更高的利息储蓄,或者投资，这就出现了差价,这就是储蓄机构盈利的方法。

耶鲁公开课 - 金融市场课程节选