You're looking for research on what's called "socioeconomic mobility". The Atlantic has summed up some of this research [1]. Basically it's become harder for

You're looking for research on what's called "socioeconomic mobility". The Atlantic has summed up some of this research [1]. Basically it's become harder for American workers to work their way up the income ladder over time. [1] https://www.theatlantic.com/business/archive/2016/07/social-mobility-america/491240/ https://www.theatlantic.com/business/archive/2016/07/social-...