Willy does achieve the stature of a tragic hero. Fighting through a world that is against him and sacrificing himself for his son by paying a debt in blood.
Linda Loman cannot believe her husband is dead. She felt as if he is was just "on another trip". Standing beside his grave she lets Willy know that she made the last payment on their house earlier that day. She felt that he was so close to being free; she couldn't understand why he would take his own life knowing that the mortgage was so close to being paid off. At that moment it made it seem like Linda views freedom in the form of being debtless. Only seeing success in the form of having complete ownership over materials. Minus that side of Linda, she is the only woman to love Willy unconditionally, due to that she has aged greatly because of her difficult life with her husband, being the one to content alone with Willy's Hallucinations and erratic behavior. Through the play Linda has shown she is the most toughest, and realistic character, maintaining herself and being the moral center of the play. .
At Willy's funeral Happy becomes increasingly angry at Biffs' observations of their father. Saying he is going to make it in the city his father couldn't to avenge his father's death by finally "beating the racket" but in reality he sounds just as delusional as his father did. Happy is seemingly content with his life. He does have a steady career and none of the obvious marks of failures that his older brother has but he does share his father's self-delusion. Proclaiming himself to be the assistant buyer at his store, when he is only the assistant to the assistant buyer at his job. Like his father he lacks any kind of self-knowledge or capacity for self-analysis. Happy is only driven by blind ambition. He will carry on the to be the self-delusional, compulsive womanizer that he is. .
Biff, unlike his father and brother does not share their self-delusion, he wants to find the truth about himself.