rock hard
dnf
Ding!
If people didn't feel like contributing, then they wouldn't get help when they needed it.
As far as stimulation goes, in nearly any career you'll find people that love what they do. Keep looking and you'll find people doing things they don't love and wish they were off doing something else.
No forced labor, though there probably would have to be some sort of carrer counceling for youth to get them started towards where they need or want to go. How much or how long you would would be a balance between what you are willing/able to do and how large the work force is. A large and efficient workforce would result in quite a bit of free time.
And yes, it would be a massive mindset change.
Its not communism because its not government regulated. The basic principal is that if you cannot sustain a contributing society, you will not survive.
You would contribute by doing someting that perpetuates or benifits the society you live in.
Instead of being brought up to chase money to make a living, you would be raised to do your part and benifit from doing so.
Contributing is dependant on what you are able to do. If you're goofing off more than you're working, then you'll most likely get in trouble by those around you.
Then how would you defend you shores from invasion?
what army?
how would it be funded?