Are people who work happier?

Depends. I am happier when I work though.

I know some people who work that are completely miserable.

Sure, especially if they enjoy what they do for a living.

Not nessecarily, that just adds a different kind of stress.

of course they are happier who work.

I think so because they have a better sense of purpose

Yesssssssssssssssssssss.

Money + contributing to society.

I am happier but stressed also

I think it's a 50-50 thing because many are not happy 

even at work my friend.

I am very happy because i work, thank you for asking.

yes they are happy becuase work is life