That is the rub with it. It assumes full employment. Capitalism produces a surplus, and because of it, people just plain don’t have to work very much to get all the basic needs met. Keynesianism was the liberal attempt at fixing this, basically by throwing their hands up and looking for ways to dig ditches to have them filled back in again. The leftist solution is to reduce working hours so you can focus on things that aren’t work, or just letting people not work altogether.