How has Willy influenced Biff and Happy?

Willie believes that it is not what a person is able to accomplish, but who he knows and how he treats them that will get a man ahead in the world. This viewpoint is tragically undermined not only by Willy's failure, but also by that of his sons, who assumed that they could make their way in life using only their charms and good looks, rather than any more solid talents. Willy's sons quickly discover their own failures through their father's phelosophy.