Tying up the threads

How much do you wrap up at the end of a story?  Everything? Nothing? The main conflict and a couple, but not all, of the subplots?

Exiting a story requires a delicate dance.  Even if the ending is abrupt, it still takes planning on the writer's part.  Whatever doesn't get tied up should remain loose by a deliberate choice on the author's part, not because it's been forgotten, or because the writer has written herself into a corner, or because the author doesn't know how to resolve something, o...