Clever boy

A teacher asks a boy: "There are 2 bags on the street , the first one has "money" , the second one has "morality". So which bag do you pick ? "
The boy: "Of course the first bag."
"You're such a mercenary boy! If I were you , I would pick the second one. Why do you pick the first one ?"-The teacher complains.
The boy says innocently : " Because I think a man will get what he doesn't have. "