The man who invented it doesn't want it.
The man who bought it doesn't need it.
The man who needs it doesn't know it.
What is it?
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Just use your imagination. The man who invented it is a coffin maker, The man who bought it is a merchant who buys it to try and make a profit and the person who needs it buys it for a friend but he doesn't know he is close to death.
To be honest I think this question is more imaginative than logic