Here is Don McLean with his number one hit from nineteen seventy-two,"American Pie."

VOA: special.2009.04.06

It's not even a zero-- or rather if I have less, you'll have less- that's a negative sum game-- or a zero sum game-- if I have more, you'll have less- it's a fixed pie.

甚至不是一个零…,或者我更少，你也会更少，那也是负和游戏-,或零和游戏，我更多，你就会更少-,饼就那么大。

哈佛公开课 - 幸福课课程节选