Nobody seems to be posting, so I will be stealing the turn. I may as well just forget the format, so here goes. I am what the dead man possesses, and what the greedy man requires. I am what a mute's mouth expresses, and what the content man desires.
Correct! A dead man possesses nothing. A greedy man requires nothing. A mute's mouth expresses nothing. A content man desires nothing.
Sweet, my turn. In time, people will follow me. For now, only birds. I have much worth, but only in people's minds. Most people possess me. What am I?