Joseph Stiglitz in his book Freefall, and Robert Reich in his Aftershock, have told similar stories, while the economists Michael Kumhof and Romain Ranciere have devised a formal mathematical version of the possible link between income concentration and financial crisis. While the underlying models differ, the Keynesian versions emphasize that if the super-rich save a lot, ever-increasing income concentration can be expected to lead to a chronic excess of planned savings over investment.
约瑟夫·斯蒂格利茨（Joseph Stiglitz）的《自由坠落》（Freefall）和罗伯特·里奇（Robert Reich）的《余震》（Aftershock）也描述了相同的观点，而经济学家迈克尔·昆霍夫（Michael Kumhof）和罗曼·兰塞勒（Romain Ranciere）为收入集中和金融危机之间的可能联系提供了数学模型。尽管基本模型与此不同，但凯恩斯主义者也强调，如果巨富阶层大量储蓄，那么可以预期，不断增加的收入集中度将导致计划储蓄长期超过投资。