How Biff shows Irresponsiblility in "The Death of a Sailsman" by Arthur Miller?

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…on Happy and Willy, and does not know what to do for a living. He realizes that he has wasted his life and has to find something besides football to succeed in. With Happy becoming tired of his antics and Willy on the verge of a breakdown, Biff is now on his own and has to become responsible. Maybe next time you don't know what to do with your life, you'll think a little harder.