0% That's right. That's the point at which you are getting to the top 10% of the US tax payers.- Yeah And only after that, does the scale increase.

没错，只有美国纳税人的前,才需要捐赠这么多。，-是的,在这之后，捐款率才会增加。

普林斯顿公开课 - 人性课程节选