I don't think it's simply a binary occupied vs. unoccupied. If you are overworked (too occupied), then there are one set of potential problems (e.g. negative im

I don't think it's simply a binary occupied vs. unoccupied. If you are overworked (too occupied), then there are one set of potential problems (e.g. negative impacts on physical and mental health). If you are unemployed (too unoccupied), then your economic opportunities might be limited. Scaling either situation across many, many human beings results in negative social consequences of one form or another.