It seems to be a very simple way of looking at it: squeeze out as much as possible from the employee without losing the employee - hence on the edge of quitting

It seems to be a very simple way of looking at it: squeeze out as much as possible from the employee without losing the employee - hence on the edge of quitting. However, I think it is way too simple to be useful. People who are happy and relatively less stressed are way more productive on average. (Yerkes - Dodson Law applies here)