In the film The Pursuit of Happyness, Chris Gardner sacrifices almost everything to succeed financially in the business world. He knows that he is capable of more, and he has this seemingly unrelenting belief that if he keeps working, he will come out on top. When I say he sacrifices "almost everything," I refer to his relationship with his son, which is one thing he is not willing to sacrifice. Chris realizes he needs to provide for his son, and he is an inspiration for his son.
Similar to Chris Gardner, Willy Loman in Miller's Death of a Salesman also makes many sacrifices to succeed financially in the business world. He doesn't have the same relationship with his son that Gardner has with his in Pursuit. In fact, one of Loman's downfalls is that he does sacrifice deep bonds with his family for more surface-level pleasures. When Biff catches Willy having an affair, it completely changes their relationship. Biff realizes Willy isn't the man Biff thought he was. Biff is still loyal to his father in that he doesn't reveal the affair, but he comes down from the pedestal Willy put him on and stands more firmly on the ground. It leads him to self-exploration and the realization that he just wants to work outside with his shirt off instead of in the business world.
All Chris does is work—for free. And he cares for his son. Even when his wife can't take it anymore, Chris stands firm with his son. Once, on his son's birthday, Chris throws some reality at his son's dreams, and his son gets upset. It only takes a minute for Chris to see that he shouldn't have done that; he swiftly tells the boy not to let anyone get in the way of what he wants, not even his father.
The bond Chris Gardner has with his son has deeper roots than the bond Willy Loman shares with Biff. Willy sees success as making money. Chris sees success as making money and providing a stout role model for his child.