Tragic Flaw

"He never knew who he was."

This excerpt from Biff at the end of the play is exactly what Willy's tragic flaw was. He never knew who he was because he was living in a false reality. He always experienced illusions that put him in another world. Everything was different in this reality. Also, this is probably why his funeral was poorly attended. If he did not even know who he was, how could people he met get to know him well? This quote from the requiem also tells us that Biff has figured out his father's tragic flaw. He has learned from it, and he is moving on. However, Happy plans to become a salesman and says he will "not let (his) father die in vain" even though he did. This shows that Happy is becoming another Willy as the play ends.