When I joined the fulltime workforce I got to wondering: "If everyone is meant to be working fulltime, who is out there being a customer to sell to?" Maybe so

When I joined the fulltime workforce I got to wondering: "If everyone is meant to be working fulltime, who is out there being a customer to sell to?" Maybe society could try a 4 day & 3 day "work weeks" with people only allowed to work one or the other by Tax office enforcement?