One is that cultural norms may develop that encourage billionaires to share their wealth, even if they are spared taxation. For example, the Giving Pledge is a commitment by some of the world’s richest people, Warren Buffett and Bill Gates among them, to devote the majority of their wealth to philanthropy.
事实上，存在很多中间的可能性。其中一种就是文化规范会发展到鼓励亿万富翁分享他们的财富——即使他们不用被征税。比如，捐赠誓言就是世界上最富有的一群人——包括沃伦·巴菲特和比尔·盖茨在内——把自身大部分财富用于慈善的承诺。