As for inequality lower down the scale, a study of the literature by Robert Gordon and Ian Dew-Becker cites the decline in trade unionism as a big factor, at least for men.

• 至于说到收入等级较低处的不平等，一份对RobertGordon和IanDew-Becker著作的研究引证说，工会主义的衰落是一个很大的因素，至少对于男性是这样。