How can I prove that Willy Loman is sane?

Question

How can I prove that Willy Loman is sane?

Answer 1

Is anyone who commits suicide for the reason he did, sane?
He keeps having delusions of being in the past (driving the old car that had the windshield that opened, visiting with his dead brother Ben). He pretends he has a job and borrows money from his friend. He has replaced an attachment on the water heater to gas himself. No, I don't think you can do that.